GFK-0467K Chapter 4 Series 90-30/20/Micro Instructions Set 4-167
4
Write Data (Function #2)

The write data function writes a data value between 0 and 15 from the parameter block to one or

more modules specified by a list in the parameter block. The parameter block requires (N + 4)

words of reference memory, where N is the number of modules to which the data will be written.

Location Field Meaning
Address Function 2 = write data
Address + 1 Error Code An error code is placed here if the function fails because
any of the modules is not present, inappropriate, or not
working. No error code is set if the function executes but
any of the modules does not receive the write data properly
Address + 2 First rack &
slot Rack and slot number (in the form RRSS in hexadecimal,
where RR is the rack number and SS is the slot number) of
the first module to which the data will be sent
Address + 3 Write data for
first module This data value will be written to the first module
Address + 4 Second rack &
slot Rack and slot number (in the form RRSS in hexadecimal,
where RR is the rack number and SS is the slot number) of
the second module to which the data will be sent
Address + 5 Write data for
second module This data value will be written to the second module
Address + (I * 2) Ith rack & slot Rack and slot number (in the form RRSS in hexadecimal,
where RR is the rack number and SS is the slot number) of
the Ith module to which the data will be sent
Address + (I * 2) + 1 Write data for
Ith module This data value will be written to the Ith module
Address + (N * 2) Last rack &
slot Rack and slot number (in the form RRSS in hexadecimal,
where RR is the rack number and SS is the slot number) of
the last module to which the data will be sent
Address + (N * 2) + 1 Write data for
last module This data value will be written to the last module
Address + (N * 2) + 2 End of list
indicator A zero in this word indicates the end of the list of modules