Quadtel XT BIOS Post Codes
- 03 - Test flag register
- 06 - Test CPU register
- 09 - Initialize system hardware
- 0C - Test BIOS ROM checksum
- 0F - Initialize 8237 DMA page register
- 12 - Test 8237 DMA address and count registers
- 15 - Initialize 8237 DMA controller
- 18 - Test 8253 programmable interrupt timer
- 1B - Initialize 8253 programmable interrupt timer
- 1E - Start memory refresh test
- 21 - Test base 64K RAM
- 24 - Set up common interrupt temp stack
- 27 - Initialize 8259 programmable interrupt controller
- 2A - Test interrupt mask register
- 2D - Test for unexpected interrupt
- 30 - Test V40 DMA if present
- 31 - Test for DDNIL bits if present
- 33 - Verify system clock interrupt
- 36 - Test keyboard
- 39 - Set up interrupt table
- 3C - Read system configuration switches
- 3F - Test video
- 42 - Determine serial ports available
- 45 - Determine parallel ports available
- 48 - Determine if game port available
- 4B - Display copyright message
- 4E - Calculate CPU speed
- 54 - Test system memory
- 55 - Test floppy drive
- 57 - Initialize system before boot
- 5A - Call interrupt 19 boot loader