Service manual

Chapter 5 E01S Fault finding
FileStore Service Manual 74
These have the same specification as for the BBC MOS, except that the character in A is
always inserted into the printer output buffer, not the current output stream buffer. If the
buffer is full, these routines wait until there is room to store the character. OSWORD
The following OS WORD functions are supported (X/Y point to the data block):
A=1 Read date/time from RTC chip.
A=2 Write date/time to RTC chip.
The date and time are in the file server format, which is:
byte 0: date in month
byte 1: years since 1981 / month (4 bits each)
byte 2: hours (24 hour clock)
byte 3: minutes
byte 4: seconds
A=3 Read timer interval.
A=4 Write timer interval.
The timer is a 5 byte value counting in 1/100 seconds, however as his
driven from the RTC it increments in steps of 1 second.
There are no ‗events‘ in the machine; the caller must poll the time
regularly to see if an interval expires.
A=5 Read non-volatile memory in RTC.
A=6 Write non-volatile memory in RTC.
TC One byte is transferred between the address at (X/Y)+4 and the RTC chip
address indicated by the bottom six bits of the byte at (X/Y). Note that the
first 14 locations are used by the RTC itself, and the remainder allocated
as follows for non-volatile use by the file server and print server:
14-15 14-15 station ID + ones complement
16-19 16-19 reserved for use by MOS
20-24 20-24 internal error logout area
25 MAXUSERS setting
26 MAXDRIVE setting
27-32 alternative POLLPS name for printer
Test routines are recommended to start from 63 downwards if they wish to
use the RTC storage.
A=16 Econet TRANSMIT- as BBC
A=17 Econet RECEIVE - as BBC
A maximum of one transmit block and eighteen receive blocks
may be active at a time.
A=19 Station information - function codes available are:
1 - write file server number
5 - write protection mask
A=114 Read/write block. Function codes available are:
&08 read block(s)
&0A write block[s]
&0D set drive parameters
&0F format drive