I-Bus IBC 2600, User Manual, Page: 115 / 140

Appendix 1 - BIOS Messages
A1-11 IBC 2600 User’s Guide
PORT 80 CODES (continued)
Code Description
50 Memory below 1 MB has been tested and initialized. Adjusting
displayed memory size for relocation and shadowing next.
51 Memory size display adjusted for relocation and shadowing. Testing
memory above 1 MB next.
52 Memory above 1 MB has been tested and initialized. Saving memory
size information next.
53 Memory size information and CPU registers are saved. Entering real
mode next.
54 Shutdown was successful. CPU in real mode. Disabling Gate A20
line, parity and NMI next.
57 A20 address line, parity and NMI are disabled. Adjusting memory size
depending on relocation and shadowing next.
58 Memory size adjusted for relocation and shadowing. Clearing “Hit
<DEL>” message next.
59 “Hit <DEL>“ message cleared. ”Wait. . .” message displayed. Starting
DMA and interrupt controller tests next.
60 DMA page register test passed. Performing DMA controller 1 base
register test next.
62 DMA controller 1 base register test passed. Performing DMA
controller 2 base register test next.
65 DMA controller_2 base register test passed. Programming DMA
controllers 1 and 2 next.
66 Completed programming DMA controllers 1 and 2. Initializing 8259
interrupt controller next.
67 Completed 8259 interrupt controller initialization.
7F Extended NMI sources enabling in progress.
80 Keyboard test started. Clearing output buffer, checking for stuck keys,
issuing keyboard reset command next.
81 Keyboard reset error or stuck key found. Issuing keyboard controller
interface test command next.
82 Keyboard controller interface test completed. Writing command byte
and initializing circular buffer next.
83 Command byte written, global data initialization completed. Checking
for looked key next.