BASR
(someone wrote) "I may be wrong but I have the Impression hat the 360/20 version of BAS/BASR (that machine's equivalent to BAL/BALR had a different op code from the current BAS/BASR." I have assembled BAS and BASR with the Tachyon assemmbler with the right X'4D' and X'0D' opcodes. I believe these are from the 360/67. There are some other diagnoses. I believe one jumps to a specified address in microcode, but the useful addresses aren't well documented. More are for the later serial numbers, with microcode in core. -- glen
Re: 360/20 instructions
I may be wrong but I have the Impression hat the 360/20 version of BAS/BASR (that machine's equivalent to BAL/BALR had a different op code from the current BAS/BASR.
Re: 360/20 instructions
We used to do that on our 360/67 (read dials into memory during IPL) until we got a machine check for a storage error (dusty contacts IIRC). Mike At 03:44 PM 5/25/2015 -0400, you wrote: >You might also like to know of an undocumented instruction specific to the >360/20. >This was a form of the Diagnose (opcode X'83') which allowed me to read the >hex dials >on the console into storage. > >This was extremely useful as I had the job of converting 1401 Autocoder into >360/20 Assembler >and this instruction enabled me to replace the sense switches. > >On later machines under DOS I used the UPSI card. > >Forgive me, but it's 50 years since I coded one of those and I can't remember >the operand, but >I'm sure someone will.
Re: 360/20 instructions
You might also like to know of an undocumented instruction specific to the 360/20. This was a form of the Diagnose (opcode X'83') which allowed me to read the hex dials on the console into storage. This was extremely useful as I had the job of converting 1401 Autocoder into 360/20 Assembler and this instruction enabled me to replace the sense switches. On later machines under DOS I used the UPSI card. Forgive me, but it's 50 years since I coded one of those and I can't remember the operand, but I'm sure someone will.
