Service manual

Chapter 5 E01S Fault finding
FileStore Service Manual 75
OSBYTE
The following OSBYTE functions are supported:
A=50 POLL TRANSMIT - as BBC
A=51 POLL RECEIVE - as BBC
A=52 Delete RECEIVE - as BBC
A=128 X=O: Read COMMAND/USER and Floppy drive door switch
states, returns 2 if drive door open, 1 if in COMMAND mode
X=252: Read free bytes in primer output buffer.
A=132 Read address of top of workspace area to X/Y. The value
returned is the current base of the MOS.
A=137 LED control. X=0 will turn off the programmable led, X=1 will turn it
on.
4.11 Link survey
Link survey functions are as follows:
Link Function
7 1µs net clock enable
6 2µs net clock enable
5 Net clock divide by enable
4 Net clock divide by 4 enable
3 Net clock divide by 8 enable