ACT apricot - Page 316

DIAGNOSTIC TEST ERROR CODES
Error Test
Number
20 PROM Checksum
22 SIO read/write
23 CRTC read/write
24 Screen RAM read/write
25 System RAM read/write
26 PIO transfer
27 PIC read/write
Possible Cause
Boot
PROM Fault
Serial input/output
controller fault.
CRT Controller fault.
Screen RAM fault.
System RAM fault.
Parallel Port fault.
Interrupt Controller fault.
28 FDC read/write/seek Disk Controller, disk drive
fault.
29 TMR read/write Programmable Timer fault.
30 RS232C transfer Z80 SIO channel A fault.
31 Keyboard initialisation Keyboard fault or Keyboard
disconnnected.
32 TMR accuracy. Programmable Timer fault.
33 TMR/PIC interaction Programmable Timer or
Interrupt Controller fault.
34 lOP initialisation/ 8089 processor.
memory transfer