POST Checkpoint Codes for AMI BIOS Release date prior to 4/9/90 Code Meaning ---- ---------------------------------------------------------------- 01 NMI disabled & 286 reg. test about to start 02 286 register test over 03 ROM checksum OK 04 8259 initialization OK 05 CMOS pending interrupt disabled 06 Video disabled & system timer counting OK 07 CH-2 of 8253 test OK 08 CH-2 delta count test OK 09 CH-1 delta count test OK 0A CH-0 delta count test OK 0B Parity status cleared 0C Refresh & system timer OK 0D Refresh link toggling OK 0E Refresh period ON/OFF 50% OK 10 Confirmed refresh ON & about to start 64K memory 11 Address line test OK 12 64K base memory test OK 13 Interrupt vectors initialized 14 8042 keyboard controller test OK 15 CMOS read/write test OK 16 CMOS checksum/battery check OK 17 Monochrome mode set OK 18 Color mode set OK 19 About to look for optional video ROM 1A Optional video ROM control OK 1B Display memory read/write test OK 1C Display memory read/write test for alternate display OK 1D Video retrace check OK 1E Global equipment byte set for video OK 1F Mode set call for Mono/Color OK 20 Video test OK 21 Video display OK 22 Power on message display OK 30 Virtual mode memory test about to begin 31 Virtual mode memory test started 32 Processor in virtual mode 33 Memory address line test in progress 34 Memory address line test in progress 35 Memory below 1MB calculated 36 Memory size computation OK 37 Memory test in progress 38 Memory initialization over below 1MB 39 Memory initialization over above 1MB 3A Display memory size 3B About to start below 1MB memory test 3C Memory test below 1MB OK 3D Memory test above 1MB OK 3E About to go to real mode (shutdown) 3F Shutdown successful and and entered in real mode 40 About to disable gate A-20 address line 41 Gate A-20 line disabled successfully 42 About to start DMA controller test 4E Address line test OK 4F Processor in real mode after shutdown 50 DMA page register test OK 51 DMA unit-1 base register test about to start 52 DMA unit-1 channel OK, about to begin CH-2 53 DMA CH-2 base register test OK 54 About to test f/f latch for unit-1 55 f/f latch test both unit OK 56 DMA unit 1 & 2 programmed OK 57 8259 initialization over 58 8259 mask register check OK 59 Master 8259 mask register OK, about to start slave 5A About to check timer and keyboard interrupt level 5B Timer interrupt OK 5C About to test keyboard interrupt 5D ERROR! timer/keyboard interrupt not in proper level 5E 8259 interrupt controller error 5F 8259 interrupt controller test OK 70 Start of keyboard test 71 Keyboard BAT test OK 72 Keyboard test OK 73 Keyboard global data initialization OK 74 Floppy setup about to start 75 Floppy setup OK 76 Hard disk setup about to start 77 Hard disk setup OK 79 About to initialize timer data area 7A Verify CMOS battery power 7B CMOS battery verification done 7D About to analyze diagnostic test results for memory 7E CMOS memory size update OK 7F About to check optional ROM C000:0 80 Keyboard sensed to enable setup 81 Optional ROM control OK 82 Printer global data initialization OK 83 RS-232 global data initialization OK 84 80287 check/test OK 85 About to display soft error message 86 About to give control to system ROM E000:0 87 System ROM E000:0 check over 00 Control given to Int-19, boot loader POST Checkpoint Codes for AMI BIOS Release date 4/9/90 to 2/15/91 Code Meaning ---- ---------------------------------------------------------------- 01 NMI disabled and 286 register test about to start. 02 286 register test passed. 03 ROM BIOS checksum (32K at F800:0) passed. 04 Keyboard controller test with and without mouse passed. 05 Chipset initialization over, DMA and Interrupt controller disabled. 06 Video disabled and system timer test begin. 07 CH-2 of 8254 initialization half way. 08 CH-2 of timer initialization over. 09 CH-1 of timer initialization over. 0A CH-0 of timer initialization over. 0B Refresh started. 0C System timer started. 0D Refresh link toggling passed. 10 Refresh on and about to start 64K base memory test. 11 Address line test passed. 12 64K base memory test passed. 15 Interrupt vectors initialized. 17 Monochrome mode set. 18 Color mode set. 19 About to look for optional video ROM at segment C000 and give control to the optional video ROM if present. 1A Return from optional video ROM. 1B Shadow RAM enable/disable completed. 1C Display memory read/write test for main display type as set in the CMOS setup program over. 1D Display memory read/write test for alternate display type complete if main display memory read/write test returns error. 1E Global equipment byte set for proper display type. 1F Video mode set call for mono/color begins. 20 Video mode set completed. 21 ROM type 27256 verified. 23 Power on message displayed. 30 Virtual mode memory test about to begin. 31 Virtual mode memory test started. 32 Processor executing in virtual mode. 33 Memory address line test in progress. 34 Memory address line test in progress. 35 Memory below 1MB calculated. 36 Memory above 1MB calculated. 37 Memory test about to start. 38 Memory below 1MB initialized. 39 Memory above 1MB initialized. 3A Memory size display initiated. This will be updated when the BIOS goes through the memory test. 3B About to start below 1MB memory test. 3C Memory test below 1MB completed and about to start above 1MB test. 3D Memory test above 1MB completed. 3E About to go to real mode. 3F Shutdown successful and processor in real mode. 40 CACHE memory on and about to disable A20 address line. 41 A20 address line disable successful. 42 486 internal cache turned on. 43 About to start DMA controller test. 50 DMA page register test complete. 51 DMA unit-1 base register test about to start. 52 DMA unit-1 base register test complete. 53 DMA unit-2 base register test complete. 54 About to check F/F latch for unit-1 and unit-2. 55 F/F latch for both units checked. 56 DMA unit 1 and 2 programming over and about to initialize 8259 interrupt controller. 57 8259 initialization over. 70 About to start keyboard test. 71 Keyboard controller BAT test over. 72 Keyboard interface test over, mouse interface test started. 73 Global data initialization for keyboard/mouse over. 74 Display 'SETUP' prompt and about to start floppy setup. 75 Floppy setup over. 76 Hard disk setup about to start. 77 Hard disk setup over. 79 About to initialize timer data area. 7A Timer data initialized and about to verify CMOS battery power. 7B CMOS battery verification over. 7D About to analyze POST results. 7E CMOS memory size updated. 7F Look for key and get into CMOS setup if found. 80 About to give control to optional ROM in segment C800 to DE00. 81 Optional ROM control over. 82 Check for printer ports and put the addresses in global data area. 83 Check for RS232 ports and put the addresses in global data area. 84 Coprpcessor detection over. 85 About to display soft error messages. 86 About to give control to system ROM at segment E000. 00 System ROM control at E000 over now give control to Int 19h boot loader. POST Checkpoint Codes for AMI BIOS Release date 2/15/91 to 6-6-92 Code Meaning ---- ---------------------------------------------------------------- 01 Processor register test about to start, and NMI to be disabled. 02 NMI is DIsabled. Power on delay starting. 03 Power on delay complete. Any initialization before keyboard BAT is in progress. 04 Any initialization before keyboard BAT is complete. Reading keyboard SYS bit, to check soft reset/ power-on. 05 Soft reset/ power-on determined. Going to enable ROM. i.e. disable shadow RAM/Cache if any. 06 ROM is enabled. Calculating ROM BIOS checksum, and waiting for KB controller input buffer to be free. 07 ROM BIOS checksum passed, KB controller I/B free. Going to issue the BAT command to keyboard controller. 08 BAT command to keyboard controller is issued. Going to verify the BAT command. 09 Keyboard controller BAT result verified. Keyboard command byte to be written next. 0A Keyboard command byte code is issued. Going to write command byte data. 0B Keyboard controller command byte is written. Going to issue Pin-23,24 blocking/unblocking command. 0C Pin-23,24 of keyboard controller is blocked/ unblocked. NOP command of keyboard controller to be issued next. 0D NOP command processing is done. CMOS shutdown register test to be done next. 0E CMOS shutdown register R/W test passed. Going to calculate CMOS checksum, and update DIAG byte. 0F CMOS checksum calculation is done, DIAG byte written. CMOS init. to begin (If "INIT CMOS IN EVERY BOOT IS SET"). 10 CMOS initialization done (if any). CMOS status register about to init for Date and Time. 11 CMOS Status register initialised. Going to disable DMA and Interrupt controllers. 12 DMA controller #1,#2, interrupt controller #1,#2 disabled. About to disable Video display and init port-B. 13 Video display is disabled and port-B is initialized. Chipset init/ auto memory detection about to begin. 14 Chipset initialization/ auto memory detection over. 8254 timer test about to start. 15 CH-2 timer test halfway. 8254 CH-2 timer test to be complete. 16 Ch-2 timer test over. 8254 CH-1 timer test to be complete. 17 CH-1 timer test over. 8254 CH-0 timer test to be complete. 18 CH-0 timer test over. About to start memory refresh. 19 Memory Refresh started. Memory Refresh test to be done next. 1A Memory Refresh line is toggling. Going to check 15 micro second ON/OFF time. 1B Memory Refresh period 30 micro second test complete. Base 64K memory test about to start. 20 Base 64k memory test started. Address line test to be done next. 21 Address line test passed. Going to do toggle parity. 22 Toggle parity over. Going for sequential data R/W test. 23 Base 64k sequential data R/W test passed. Any setup before Interrupt vector init about to start. 24 Setup required before vector initialzation complete. Interrupt vector initialization about to begin. 25 Interrupt vector initialization done. Going to read I/O port of 8042 for turbo switch (if any). 26 I/O port of 8042 is read. Going to initialize global data for turbo switch. 27 Global data initialization is over. Any initialization after interrupt vector to be done next. 28 Initialization after interrupt vector is complete. Going for monochrome mode setting. 29 Monochrome mode setting is done. Going for Color mode setting. 2A Color mode setting is done. About to go for toggle parity before optional rom test. 2B Toggle parity over. About to give control for any setup required before optional video ROM check. 2C Processing before video ROM control is done. About to look for optional video ROM and give control. 2D Optional video ROM control is done. About to give control to do any procesing after video ROM returns control. 2E Return from processing after the video ROM control. If EGA/VGA not found then do display memory R/W test. 2F EGA/VGA not found. Display memory R/W test about to begin. 30 Display memory R/W test passed. About to look for the retrace checking. 31 Display memory R/W test or retrace checking failed. About to do alternate Display memory R/W test. 32 Alternate Display memory R/W test passed. About to look for the alternate display retrace checking. 33 Video display checking over. Verification of display type with switch setting and actual card to begin. 34 Verification of display adapter done. Display mode to be set next. 35 Display mode set complete. BIOS ROM data area about to be checked. 36 BIOS ROM data area check over. Going to set cursor for power on message. 37 Cursor setting for power on message id complete. Going to display the power on message. 38 Power on message display complete. Going to read new cursor positon. 39 New cursor position read and saved. Going to display the reference string. 3A Reference string display is over. Going to display the Hit message. 3B Hit message displayed. Virtual mode memory test about to start. 40 Preperation for virtual mode test started. Going to verify from video memory. 41 Returned after verifying from display memory. Going to prepare the descriptor tables. 42 Descriptor tables prepared. Goin to enter in virtual mode for memory test. 43 Entered in the virtual mode. Going to enable interrupts for diagnostics mode. 44 Interrupts enabled (if diagnostics switch is on). Going to initialize data to check memory wrap around at 0:0. 45 Data initialized. Going to check for memory wrap around at 0:0 and finding the total system memory size. 46 Memory wrap around test done. Memory size calculation over. About to go for writing patterns to test memory. 47 Pattern to be tested written in extended memory. Going to write patterns in base 640k memory. 48 Patterns written in base memory. Going to findout amount of memory below 1M memory. 49 Amount of memory below 1M found and verified. Going to findout amount of memory above 1M memory. 4A Amount of memory above 1M found and verified. Going for BIOS ROM data area check. 4B BIOS ROM data area check over. Going to check and to clear memory below 1M for soft reset. 4C Memory below 1M cleared. (SOFT RESET) Going to clear memory above 1M. 4D Memory above 1M cleared. (SOFT RESET) Going to save the memory size. 4E Memory test started. (NO SOFT RESET) About to display the first 64k memory test. 4F Memory size display started. This will be updated during memory test. Going for sequential and random memory test. 50 Memory test below 1M complete. Going to adjust memory size for relocation/ shadow. 51 Memory size adjusted due to relocation/ shadow. Memory test above 1M to follow. 52 Memory test above 1M complete. Going to prepare to go back to real mode. 53 CPU registers are saved including memory size. Going to enter in real mode. 54 Shutdown successfull, CPU in real mode. Going to restore registers saved during preparation for shutdown. 55 Registers restored. Going to disable gate A20 address line. 56 A20 address line disable successful. BIOS ROM data area about to be checked. 57 BIOS ROM data area check halfway. BIOS ROM data area check to be complete. 58 BIOS ROM data area check over. Going to clear Hit message. 59 Hit message cleared. message displayed. About to start DMA and interrupt controller test. 60 DMA page register test passed. About to verify from display memory. 61 Display memory verification over. About to go for DMA #1 base register test. 62 DMA #1 base register test passed. About to go for DMA #2 base register test. 63 DMA #2 base register test passed. About to go for BIOS ROM data area check. 64 BIOS ROM data area check halfway. BIOS ROM data area check to be complete. 65 BIOS ROM data area check over. About to program DMA unit 1 and 2. 66 DMA unit 1 and 2 programming over. About to initialize 8259 interrupt controller. 67 8259 initialization over. About to start keyboard test. 80 Keyboard test started. clearing output buffer, checking for stuck key, About to issue keyboard reset command. 81 Keyboard reset error/stuck key found. About to issue keyboard controller interface test command. 82 Keyboard controller interface test over. About to write command byte and init circular buffer. 83 Command byte written, Global data init done. About to check for lock- key. 84 Lock-key checking over. About to check for memory size mismatch with cmos. 85 Memory size check done. About to display soft error and check for pasasword or bypass setup. 86 Password checked. About to do pogramming before setup. 87 Programming before setup complete. Going to cmos setup program. 88 Returned from cmos setup program and screen is cleared. About to do programming after setup. 89 Programming after setup complete. Going to display power on screen message. 8A First screen message displayed. About to display message 8B message displayed. About to do Main and Video BIOS shadow. 8C Main and Video BIOS shadow successful. Setup options programming after cmos setup about to start. 8D Setup options are programmed, mouse check and init to be done next. 8E Mouse check and initialisation complete. Going for hard disk, floppy reset. 8F Floppy check returns that floppy is to be initialized. Floppy setup to follow. 90 Floppy setup is over. Test for hard disk presence to be done. 91 Hard disk presence test over. Hard disk setup to follow. 92 Hard disk setup complete. About to go for BIOS ROM data area check. 93 BIOS ROM data area check halfway. BIOS ROM data area check to be complete. 94 BIOS ROM data area check over. Going to set base and extended memory size. 95 Memory size adjusted due to mouse support, hdisk type-47. Going to verify from display memory. 96 Returned after verifying from display memory. Going to do any init before C800 optional ROM control 97 Any init before C800 optional ROM control is over. Optional ROM check and control will be done next. 98 Optional ROM control is done. About to give control to do any required procesing after optional ROM returns control. 99 Any initialization required after optional ROM test over. Going to setup timer data area and printer base address. 9A Return after setting timer and printer base address. Going to set the RS-232 base address. 9B Returned after RS-232 base address. Going to do any initialization before Co-processor test 9C Required initialization before co-processor is over. Going to initialize the coprocessor next. 9D Coprocesor initialized. Going to do any initialization after Co- processor test. 9E Initialization after co-processor test is complete. Going to check extd keyboard, keyboard ID and num-lock. 9F Extd keyboard check is done, ID flag set. num-lock on/off. Keyboard ID command to be issued. A0 Keyboard ID command issued. Keyboard ID flag to be reset. A1 Keyboard ID flag reset. Cache memory test to follow. A2 Cache memory test over. Going to display any soft errors. A3 Soft error display complete. Going to set the keyboard typematic rate. A4 Keyboard typematic rate set. Goin to program memory wait states. A5 Memory wait states programming over. Screen to be cleared next. A6 Screen cleared. Going to enable parity and NMI. A7 NMI and parity enabled. Going to do any initialization required before giving control to optional ROM at E000. A8 Initialization before E000 ROM control over. E000 ROM to get control next. A9 Returned from E000 ROM control. Going to do any initialization required after E000 optional ROM control. AA Initialization after E000 optional ROM control is over. Going to display the system configuration. 00 System configuration is displayed. Going to give control to INT 19h boot loader. POST Checkpoint Codes for AMI BIOS Release date after 6/6/92 Code Meaning ---- ---------------------------------------------------------------- 01 Processor register test about to start, and NMI to be disabled. 02 NMI is DIsabled. Power on delay starting. 03 Power on delay complete. Any initialization before keyboard BAT is in progress. 04 Any initialization before keyboard BAT is complete. Reading keyboard SYS bit, to check soft reset/ power-on. 05 Soft reset/ power-on determined. Going to enable ROM. i.e. disable shadow RAM/Cache if any. 06 ROM is enabled. Calculating ROM BIOS checksum, and waiting for KB controller input buffer to be free. 07 ROM BIOS checksum passed, KB controller I/B free. Going to issue the BAT command to keyboard controller. 08 BAT command to keyboard controller is issued. Going to verify the BAT command. 09 Keyboard controller BAT result verified. Keyboard command byte to be written next. 0A Keyboard command byte code is issued. Going to write command byte data. 0B Keyboard controller command byte is written. Going to issue Pin-23,24 blocking/unblocking command. 0C Pin-23,24 of keyboard controller is blocked/ unblocked. NOP command of keyboard controller to be issued next. 0D NOP command processing is done. CMOS shutdown register test to be done next. 0E CMOS shutdown register R/W test passed. Going to calculate CMOS checksum, and update DIAG byte. 0F CMOS checksum calculation is done, DIAG byte written. CMOS init. to begin (If "INIT CMOS IN EVERY BOOT IS SET"). 10 CMOS initialization done (if any). CMOS status register about to init for Date and Time. 11 CMOS Status register initialised. Going to disable DMA and Interrupt controllers. 12 DMA controller #1,#2, interrupt controller #1,#2 disabled. About to disable Video display and init port-B. 13 Video display is disabled and port-B is initialized. Chipset init/ auto memory detection about to begin. 14 Chipset initialization/ auto memory detection over. 8254 timer test about to start. 15 CH-2 timer test halfway. 8254 CH-2 timer test to be complete. 16 Ch-2 timer test over. 8254 CH-1 timer test to be complete. 17 CH-1 timer test over. 8254 CH-0 timer test to be complete. 18 CH-0 timer test over. About to start memory refresh. 19 Memory Refresh started. Memory Refresh test to be done next. 1A Memory Refresh line is toggling. Going to check 15 micro second ON/OFF time. 1B Memory Refresh period 30 micro second test complete. Base 64K memory test about to start. 20 Base 64k memory test started. Address line test to be done next. 21 Address line test passed. Going to do toggle parity. 22 Toggle parity over. Going for sequential data R/W test. 23 Base 64k sequential data R/W test passed. Any setup before Interrupt vector init about to start. 24 Setup required before vector initialzation complete. Interrupt vector initialization about to begin. 25 Interrupt vector initialization done. Going to read I/O port of 8042 for turbo switch (if any). 26 I/O port of 8042 is read. Going to initialize global data for turbo switch. 27 Global data initialization is over. Any initialization after interrupt vector to be done next. 28 Initialization after interrupt vector is complete. Going for monochrome mode setting. 29 Monochrome mode setting is done. Going for Color mode setting. 2A Color mode setting is done. About to go for toggle parity before optional rom test. 2B Toggle parity over. About to give control for any setup required before optional video ROM check. 2C Processing before video ROM control is done. About to look for optional video ROM and give control. 2D Optional video ROM control is done. About to give control to do any procesing after video ROM returns control. 2E Return from processing after the video ROM control. If EGA/VGA not found then do display memory R/W test. 2F EGA/VGA not found. Display memory R/W test about to begin. 30 Display memory R/W test passed. About to look for the retrace checking. 31 Display memory R/W test or retrace checking failed. About to do alternate Display memory R/W test. 32 Alternate Display memory R/W test passed. About to look for the alternate display retrace checking. 33 Video display checking over. Verification of display type with switch setting and actual card to begin. 34 Verification of display adapter done. Display mode to be set next. 35 Display mode set complete. BIOS ROM data area about to be checked. 36 BIOS ROM data area check over. Going to set cursor for power on message. 37 Cursor setting for power on message id complete. Going to display the power on message. 38 Power on message display complete. Going to read new cursor positon. 39 New cursor position read and saved. Going to display the reference string. 3A Reference string display is over. Going to display the Hit message. 3B Hit message displayed. Virtual mode memory test about to start. 40 Preperation for virtual mode test started. Going to verify from video memory. 41 Returned after verifying from display memory. Going to prepare the descriptor tables. 42 Descriptor tables prepared. Goin to enter in virtual mode for memory test. 43 Entered in the virtual mode. Going to enable interrupts for diagnostics mode. 44 Interrupts enabled (if diagnostics switch is on). Going to initialize data to check memory wrap around at 0:0. 45 Data initialized. Going to check for memory wrap around at 0:0 and finding the total system memory size. 46 Memory wrap around test done. Memory size calculation over. About to go for writing patterns to test memory. 47 Pattern to be tested written in extended memory. Going to write patterns in base 640k memory. 48 Patterns written in base memory. Going to findout amount of memory below 1M memory. 49 Amount of memory below 1M found and verified. Going to findout amount of memory above 1M memory. 4A Amount of memory above 1M found and verified. Going for BIOS ROM data area check. 4B BIOS ROM data area check over. Going to check and to clear memory below 1M for soft reset. 4C Memory below 1M cleared. (SOFT RESET) Going to clear memory above 1M. 4D Memory above 1M cleared. (SOFT RESET) Going to save the memory size. 4E Memory test started. (NO SOFT RESET) About to display the first 64k memory test. 4F Memory size display started. This will be updated during memory test. Going for sequential and random memory test. 50 Memory test below 1M complete. Going to adjust memory size for relocation/ shadow. 51 Memory size adjusted due to relocation/ shadow. Memory test above 1M to follow. 52 Memory test above 1M complete. Going to prepare to go back to real mode. 53 CPU registers are saved including memory size. Going to enter in real mode. 54 Shutdown successfull, CPU in real mode. Going to restore registers saved during preparation for shutdown. 55 Registers restored. Going to disable gate A20 address line. 56 A20 address line disable successful. BIOS ROM data area about to be checked. 57 BIOS ROM data area check halfway. BIOS ROM data area check to be complete. 58 BIOS ROM data area check over. Going to clear Hit message. 59 Hit message cleared. message displayed. About to start DMA and interrupt controller test. 60 DMA page register test passed. About to verify from display memory. 61 Display memory verification over. About to go for DMA #1 base register test. 62 DMA #1 base register test passed. About to go for DMA #2 base register test. 63 DMA #2 base register test passed. About to go for BIOS ROM data area check. 64 BIOS ROM data area check halfway. BIOS ROM data area check to be complete. 65 BIOS ROM data area check over. About to program DMA unit 1 and 2. 66 DMA unit 1 and 2 programming over. About to initialize 8259 interrupt controller. 67 8259 initialization over. About to start keyboard test. 80 Keyboard test started. clearing output buffer, checking for stuck key, About to issue keyboard reset command. 81 Keyboard reset error/stuck key found. About to issue keyboard controller interface test command. 82 Keyboard controller interface test over. About to write command byte and init circular buffer. 83 Command byte written, Global data init done. About to check for lock- key. 84 Lock-key checking over. About to check for memory size mismatch with cmos. 85 Memory size check done. About to display soft error and check for pasasword or bypass setup. 86 Password checked. About to do pogramming before setup. 87 Programming before setup complete. Going to cmos setup program. 88 Returned from cmos setup program and screen is cleared. About to do programming after setup. 89 Programming after setup complete. Going to display power on screen message. 8A First screen message displayed. About to display message 8B message displayed. About to do Main and Video BIOS shadow. 8C Main and Video BIOS shadow successful. Setup options programming after cmos setup about to start. 8D Setup options are programmed, mouse check and init to be done next. 8E Mouse check and initialisation complete. Going for hard disk, floppy reset. 8F Floppy check returns that floppy is to be initialized. Floppy setup to follow. 90 Floppy setup is over. Test for hard disk presence to be done. 91 Hard disk presence test over. Hard disk setup to follow. 92 Hard disk setup complete. About to go for BIOS ROM data area check. 93 BIOS ROM data area check halfway. BIOS ROM data area check to be complete. 94 BIOS ROM data area check over. Going to set base and extended memory size. 95 Memory size adjusted due to mouse support, hdisk type-47. Going to verify from display memory. 96 Returned after verifying from display memory. Going to do any init before C800 optional ROM control 97 Any init before C800 optional ROM control is over. Optional ROM check and control will be done next. 98 Optional ROM control is done. About to give control to do any required procesing after optional ROM returns control. 99 Any initialization required after optional ROM test over. Going to setup timer data area and printer base address. 9A Return after setting timer and printer base address. Going to set the RS-232 base address. 9B Returned after RS-232 base address. Going to do any initialization before Co-processor test 9C Required initialization before co-processor is over. Going to initialize the coprocessor next. 9D Coprocesor initialized. Going to do any initialization after Co- processor test. 9E Initialization after co-processor test is complete. Going to check extd keyboard, keyboard ID and num-lock. 9F Extd keyboard check is done, ID flag set. num-lock on/off. Keyboard ID command to be issued. A0 Keyboard ID command issued. Keyboard ID flag to be reset. A1 Keyboard ID flag reset. Cache memory test to follow. A2 Cache memory test over. Going to display any soft errors. A3 Soft error display complete. Going to set the keyboard typematic rate. A4 Keyboard typematic rate set. Goin to program memory wait states. A5 Memory wait states programming over. Screen to be cleared next. A6 Screen cleared. Going to enable parity and NMI. A7 NMI and parity enabled. Going to do any initialization required before giving control to optional ROM at E000. A8 Initialization before E000 ROM control over. E000 ROM to get control next. A9 Returned from E000 ROM control. Going to do any initialization required after E000 optional ROM control. AA Initialization after E000 optional ROM control is over. Going to display the system configuration. 00 System configuration is displayed. Going to give control to INT 19h boot loader.