Appendix B

Summary of BIOS Calling Sequences

Following in Figure B.0 is a summary of what has been described in section 4.3. Processor-specific protocols for certain machines are provided in Appendix C. All calls to BIOS return a completion code.

Entry Point	Parameters
CONSOLEREAD	single data byte
CONSOLEWRITE	single data byte
CONSOLEINIT	UIR pointer
PRINTERREAD	single data byte
PRINTERWRITE	single data byte
PRINTERINIT	UIR pointer
DISKREAD	block no. byte count data area address drive no. CONTROL word
DISKWRITE	block no. byte count data area address drive no. CONTROL word
DISKINIT	drive no. UIR pointer
REMOTEREAD	single data byte
REMOTEWRITE	single data byte
REMOTEINIT	UIR pointer
MEMSIZE	Address of last RAM word
SYSHALT	(none)
CLOCKSTART (none)