CP : xx state/meaning,
shown during Machine initialization
(POST phase 1 and 2)
CP output during Stage 1 POST
|
| CP | Description
|
| 01 | Disable clock interrupts, turn off screen,
mask off parity, initialize interrupt controller,
initialize error logging formats |
| 02 | Memory DMA refresh test |
| 03 | Channel reset |
| 04 | Test planar ports (94, 96, 100, 102)
initialize default planar POS |
| 05 | Check CMOS/NVRAM for validity,
initialize EXPRESSWAY
(on Model 90 systems only) |
| 06 | Initialize dot clock |
| 07 | Enable base memory |
| 08 | Base memory testing - data integrity |
| 09 | Base memory testing - addressability |
| 0F | Fatal base memory error - recovery not successful |
|
| 10 | Start up drive 80 |
| 11 | Enable extended memory, initialize base memory,
disable SRAM, reset parity/channel check.
Initialize row, column of cursor. |
| 12 | Test protected mode |
| 14 | Initialize the 8259 interrupt controller |
| 15 | Initialize the interrupt vectors |
| 16 | Initialize BIOS interrupt vectors |
| 17 | Verify DMA transfers |
| 18 | POS setup, set CMOS clock |
| 1A | Set divide-by-0 interrupt vector |
|
| 24 | Set CMOS equipment byte |
| 25 | Check for manufacturing boot request |
|
| 30 | Test DMA transfers |
| 34 | Protected mode Shutdown |
| 35 | Test video card type error |
|
| 40 | Check for video feature ROM and video presence |
| 41 | Reset parity and channel checks, load NMI vector
with dummy interrupt handler, test timer,
load NMI vector to POST NMI handler |
| 42 | Test interrupt mask register |
| 43 | Test interrupt mask register with device interrupt |
| 44 | Check hot interrupts |
| 45 | Check hot interrupts without I/O-memory parity enabled |
| 46 | Interrupt mask error |
| 47 | Timer 2 read/write, verify Timer 0 bits |
| 48 | Verify Timer 2 output |
| 49 | Verify Timer 0 on off bits |
| 4A | Verify Timer 2 output |
| 4B | Verify Timer 0 interrupt |
| 4C | Verify Timer 0 count/refresh |
| 4D | Verify Timer 3 NMI |
| 4E | Check keyboard controller for last command accepted |
|
| 5C | Set hardware interrupt vectors 0-7 |
| 5D | Set hardware interrupt vectors 8-15 |
| 5E | Set rest of interrupt vectors |
| 5F | Test serial port |
|
| 62 | Turn on drive 0 motor Note 1) |
| 64 | Test ASYNC registers, modem control lines,
and data loop.
If ASCII console selected - initialize
ASCII console as system display device |
| 65 | Enable timer interrupts |
| 66 | Check for manufacturing boot and unmask NMI interrupts Note 2) |
| 6E | Check for system security or CE override conditions,
run diskette testing and setup, go load first IML image |
|
| 80 | Start of IML process. SCSI POST |
| 81 | Diskette IML. Load and verify IML boot record from diskette |
| 82 | Disk IML. Load and verify IML boot record from disk |
| 83 | Diskette IML. Diskette recovery from SCSI IML failure.
Load in and verify IML boot record from diskette |
|
| 90 - B6 | Protected mode exception |
|
| BE | Build descriptor tables for protected mode Note 3) |
| BF | Completion of descriptor tables for protected mode |
|
| C0 | Base memory addressing test, extended memory enable,
base memory initialization |
| CA | Cache testing (tag RAM, linefill, DMA snooping) |
| CB | Second Group Cache Testing - L1 DMA snoop |
| CC | Second Group Cache Testing - L1 linefill |
| CD | Second Group Cache Testing - non cacheable range boundary |
| CE | Second Group Cache Testing - L2 DMA snoop |
| CF | Second Group Cache Testing - L2 linefill |
|
| EB | Dual Bus Interface Controller internal register error |
|
| F0 | Protected mode initialization |
| F1 | Test interrupts in protected mode |
| F2 | Test exception interrupt in protected mode |
| F3 | Verify 286 descriptor instructions in protected mode |
| F4 | Verify 286 BOUND instruction in protected mode |
| F5 | Verify PUSHALL/POPALL instructions in protected mode |
| F6 | Verify ACCESSRIGHTS function in protected mode |
| F7 | Verify ADJUSTRPL fields in protected mode |
| F8 | Verify LOAD instructions in protected mode |
| F9 | Verify LOAD instructions in protected mode (continued) |
| FA | Test low meg chip select in protected mode |
