Table of Contents
Advertisement
PC10-1/10-2/10-Ill SERVICE MANUAL
CODE
62
80
81
AO
C1
C2
1701
DO
E1
E2
FF
CAUSE OF ERROR
MAIN RAM
R/W storage failure in the RAM size specified by DIP switches 3 and 4. Either the RAM
is bad or the DIP switches reflect the wrong RAM size.
Action: Print RAM segment in error followed by the bit pattern (e.g. AA or 55) or 00 (for
parity error) followed by the words RAM. Memory size is adjusted downwards.
VIDEO RAM
R/W storage failure in the video RAM section. As set by DIP switches.
Action: Issue one long and two short beeps.
VIDEO RETRACE
No video signal found or retrace pulses missing.
Action: Issue one long and two short beeps.
KEYBOARD
No keyboard present, or key struck, or bad keyboard.
Action: Print scan code of stuck key (if any) followed by the word KEY.
ROM SEARCH 1
An extension ROM at C0000 to C7FFF (hex) is found with a bad checksum.
Action: Issue two short and one long beep. Print segment of ROM on screen followed
by the word ROM.
ROM SEARCH 2 - HD BIOS
An extension ROM at C8000 to EFFFF (hex) is found with a bad checksum. Indicates
ROM on HD controller failure.
Action: Issue two short and one long beep. Print segment of ROM on screen followed
by the word ROM.
HARD DISK CONTROLLER
The hard disk controller contains BIOS code for operating the hard disk. If the ROM
checksum is OK it is called at powerup for checking the hard disk and controller. An
error is indicated by printing 1701 on the screen.
FLOPPY DISK CONTROLLER
Bad status response after controller initialization.
Action: Print the word FDC on the screen.
PRINTER
Printer port data lines do not read back same contents.
Action: Print the word PRN on screen.
SERIAL INTERFACE
- ACIA
Fault with serial interface.
Action: Print the word ACIA on screen.
SYSTEM OK, END OF DIAGNOSTICS.
Actions: Attempts to bootstrap if DIP switch 1 is OFF. If this switch is ON the system
performs a cold start and loops the diagnostics until an error is found. Even if an error
is above 61 (hex) the system halts.
Note:
This message will not be printed on the screen.
24
Advertisement
Table of Contents
