Microid Research
Microid Research MR-BIOS 20 East Main Street #6
======================== Los Gatos, CA 95032
00 Cold-Boot Commences (Not Seen with Warm-Boot)
01 HOOK 00 OEM Specific, Typically Restores Chipset to Default
02 Disable Critical I/O: 6845s, 8237s, 765, and Parity Latches
03 ROM BIOS Checksum Test
04 Page Register Test (Ports 81-8F)
05 8042 (Keyboard Controller) Selftest
06 8237-slave/master, 8254-ch2/1, RTC-REG-F/A, 8259-master/slave
07 Memory Refresh Circuit test
08 Master (16 bit) DMA Controller Failure
08 Slave (8 bit) DMA Controller Failure
09 HOOK 01 OEM Specific, Typically Disables Cache, Shadow
0A Base 64K Memory Test - Beep Code Describes Failure
0A Memory Bank 0 Pattern Test Failure
0A Memory Bank 0 Parity Circuitry Failure
0A Memory Bank 0 Parity Error
0A Memory Bank 0 Data Bus Failure
0A Memory Bank 0 Address Bus Failure
0A Memory Bank 0 Block Access Read Failure
0A Memory Bank 0 Block Access Read/Write Failure
0b Master 8259 (Port 21) Failure
0b Slave 8259 (Port A1) Failure
0C 8259/IRQ tests - Beep Code Describes Failure
0C Master 8259 (Port 20) Interrupt Address Error
0C Slave 8259 (Port A0) Interrupt Address Error
0C 8259 (Port 20/A0) Interrupt Address Error
0C Master 8259 (Port 20) Stuck Interrupt Error
0C Slave 8259 (Port A0) Stuck Interrupt Error
0C System timer 8254 CH0/IRQ0 Interrupt Failure
0d 8254 Channel-0 Test and Initialization
0E 8254 Channel-2 (Speaker) Failure
0E 8254 OUT2 (Speaker Detect) Failure
0F RTC tests/inits: Init REG-B, Write/Readback CMOS-RAM, PIE Test
0F CMOS RAM Read/Write Test Failure
0F RTC Periodic Interrupt / IRQ8 Failure
10 Video Initialization and (Cold-Boot) Signon Message
11 CMOS Checksum Test
12 Keyboard Controller Failure
13 HOOK 02 OEM Specific
14 Size/Test Base Memory (Low 64K Already Done)
15 Perform 2nd Try KB Init, if Necessary
16 HOOK 03 Size/Test Cache, Other OEM Unique Code
17 A20 Gate Stuck in Asserted State
17 A20 Test Failure Due to 8042 Timeout
17 A20 Gate Stuck in Disabled State
18 Size/Test Extended Memory
19 HOOK 04 and Size/Test System Memory ("Special" OEM Memory)
19 Memory Parity Error
19 IO Channel Error
1A Real Time Clock (RTC) Settings are Invalid
1A Real Time Clock (RTC) is Not Updating
1b Serial Port Determination Off-board/On-board
1C Parallel Port Determination, Off-board/On-board
1d Coprocessor Determination/Initialization
1E Floppy Controller Test/Determination, CMOS Validation
1F Fixed Disk Controller Test/Determination, CMOS Validation
20 Rigorous CMOS Parameter Validation
21 Front-Panel Lock Check, Wait for User to Acknowledge Errors
22 Set NumLock, Password-Security Trap, Dispatch to Setup-Utility
23 HOOK 05 OEM Specific
24 Set Typematic Rate
25 Floppy Subsystem Initialization
26 Fixed Subsystem Initialization
27 ACK Errors, Set Primary Adaptor Video Mode
28 HOOK 06 OEM Specific, Typically Enables Shadow, Cache, Speed
29 Adaptor ROM Installation
2A ACK Errors, set Video Mode, Set DOS Time Variables From RTC
2b Enable Parity Checking and NMI
2C Set Low Stack, Install E000 ROM
2d ACK Errors, Set Primary Video Mode
2E HOOK 07 OEM Specific
2F Pass Control to INT19 (Boot Disk)
