On 06-Sep-18 06:59, Lars Brinkhoff wrote: > Hello, > > There is a USB device called the Panda Display. Its purpose is to allow > PDP-10 simulators to display internal state using LEDs, much like a > front panel. I have patched Richard Cornwell's KA10 simulator to make > the DATA PI, instruction display on the LEDs. > > I have checked the KS10 instruction set. It doesn't have a DATAO PI, > instruction. However that particular opcode isn't in used, so it's just > a UUO. This is also the case for ITS microcode. Before I start working > on anything, I'd like to ask if it would be OK to repurpose this opcode > for its traditional use? > > https://gitlab.com/DavidGriffith/panda-display > Neither the KL nor the KS use DATAO PI,. I don't have a problem with implementing it for the KS. It would need to act like any IO instruction - MUUO in user mode, functional in Exec and with User-In-Out. It's also useless unless there is a place to display the lights - so unless the display hardware is present, you might as well let it MUUO.
The LIGHTS UUO (calli -1) was disabled in TOPS-10 when support for the KI was dropped. Early KS monitors compiled it as a NOP. So to be useful, you need a (trivial) monitor patch. EDDT might need a tweak to properly decode it. Note that the corresponding DATAO PTR, (set switches, KI only) overlaps TIOE on the KS, and thus could not be implemented.
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