Tandy 1000 SL Technical Reference Manual page 576

BIOS Services
Value
01H
02H
03H
04H
06H
08H
09H
10H
20H
40H
80H
Error Condition
Illegal Function
Address Mark Not Found
Write Protect Error
Sector Not Found
Diskette Change Line Active
DMA Overrun
Attempt to DMA Across a
64K Boundary
Bad CRC on Disk Read
Controller Failure
Seek Failure
Device Timeout, Device Failed to Respond
The structure and usage of the RS232 driver RAM data area is as fol-
lows:
HEX Offset
From Segment Length and
0040:OOOO
Intended Use
O O H
7CH
4 words
-
4 words
-
Base address of each one of 4
possible comm cards
1 word timeout count for each
of
4
possible comm cards
55.