Zenith 191 BIOS Post Codes
- 00 - Booting the operating system
- 01 - VGA check
- 02 - MDA initialize
- 03 - Initialize video
- 05 - Set hard reset
- 07 - Check ROM at E000
- 08 - Check ROM shadow at F000
- 09 - Remap video ROM at E000
- 0C - CMOS RAM/8042 keyboard controller test
- 0D - DMA controller test
- 0E - DMA page register test
- 0F - Test 64K base RAM
- 10 - Test base memory
- 11 - Second VGA unit
- 12 - mono initialization
- 13 - Real time clock/CMOS RAM test
- 15 - CPU register test
- 16 - CPU addition test
- 17 - Real time clock/8042 keyboard controller test
- 18 - Enter protected mode
- 19 - Testing memory
- 1A - Test extended memory
- 1B - Leaving protected mode
- 1C - Testing system board
- 1D - Testing system board
- 1E - Testing system board
- 1F - Bus sizing
- 20 - Set BIOS data area
- 21 - Testing DMA controller
- 22 - checking C800 for ROM
- 24 - Testing base memory
- 25 - 8042 keyboard controller test
- 26 - 8042 keyboard controller test
- 27 - 8042 keyboard controller test
- 28 - Memory parity test
- 29 - Programmable interrupt timer test
- 2A - Testing floppy disk drive(s)
- 2B - Testing floppy drive controller and drive(s)
- 2C - Testing hard disk controller and drive(s)
- 2D - Checking CMOS settings
- 2E - Soft configuration
- 30 - Checking adapter ROM's
- 31 - Checking CMOS settings
- 32 - Enabling interrupts
- 33 - Soft configuration
- 34 - Soft configuration
- 35 - Jump to boot code