5.5 . Error Messages and Troubleshooting
The table below explains the parts that may be faulty or damaged should an error message occur while performing the various test items of the self diagnostics program.
| Test classification | Screen display test items | Contents |
1 | CPU | A20 GATE TEST | Address 20 line |
2 | (CPU related) | CACHE ON/OFF | Cache memory on/off |
3 |
| NPU OPERAND TEST | Floating point processor function |
4 | RAM (Memory related) | RAM STANDARD | Memory standard |
5 | CONTROL | DMA PAGE REG TEST | DMA page register |
6 | (Control ICs on the | DMA REGISTER TEST | DAM register |
7 | main board, etc.) | DMAC Transfer TEST | DAM transfer test |
8 |
| PIC HALT INSTRUCTION TEST | Interrupt controller |
9 |
| PIC REGISTER TEST | Interrupt controller |
10 |
| RTC CMOS RAM TEST | Real time clock CMOS |
11 |
|
|
|
12 |
| SPEAKER TEST | Speaker |
13 |
| PIT CH0 TEST | Interrupt timer CH0 |
14 |
| PIT CH1 TEST | Interrupt timer CH1 |
15 |
| PIT CH2 TEST | Interrupt timer CH2 |
16 | IO | KEYBOARD REG TEST | Keyboard |
17 | PS/2 MOUSE REG | Mouse | |
18 | COMMUNICATION | SERIAL WRAP TEST | Serial loop back (jig required) |
19 |
| SERIAL ALL INTERNAL TEST | Serial port |
20 |
| PARALLEL REGISTER R/W | Parallel register |
21 | AUX | PCIC ALL TEST | PCIC |
(Auxiliary functions) | Card Bus REG | Card Bus port | |
|
| USB REG | USB port |
22 | VIDEO | VGA ALL TEST | VGA |
23 | (Display related) | SVGA RAM TEST | SVGA RAM |
24 |
| VESA MODE TEST | VESA mode |
25 | DISK | FD WT/RD/WP TEST | FD write/read/write protection |
26 | (FDD, HDD) | HDD ALL TEST | Only HDD lead selected |
27 | UNIQUE | ECP REGISTER R/W | Parallel port |
28 | (Individual functions) | EPP REGISTER R/W | Parallel port |
29 |
| EXT. CMOS R/W TEST | Extension CMOS R/W test |
