I'm here (voidstar) :) I think at the time I wasn't aware of cctalk, or it wasn't working for me at the time. This past summer I got to explore the actual original SCAMP! I'm still (slowly) going through the Joe George journals. But one of the most interesting things - I found a reference to PALM as early as 1972! (i.e. a manual similar to your Chapter 2 reference, but written during the SCAMP development - the instruction set was mostly the same, except they did add one instruction later to the IBM 5100; a shift left/rotate I think, I'll have to double check tomorrow) https://voidstar.blog/scamp-a-review-50-years-later/ More recently I've gotten distracted on an almost-working Poly88. It has a chance of working, I feel a pulse in there! After that, I'll get back to the 5100 PALM... I think my most recent 5110 work was a PALM app as follows (which I've probably shared here already) https://www.youtube.com/watch?v=geiprqvhZUY Mainly at 1:20 into that video I try to show the extent of audio that we can make a 5110 do. The other features in here are draft ideas to put into a more comprehensive demo (i.e. can do a counter, and those are the set of symbols we have to work with). And the most recent update: a local associate has gotten a disk drive working on his 5110, and demo'd running a football game on that system from BASIC! Looking forward to more titles getting loaded and running, and also hoping we can get a process to get those disk files transferred over to tape (except my 5106 only works on my 5100, turns out it can't work on a 5110!).. so we're thinking if we can get one of the 5103 printers working, we just print the BASIC code out, and I use my "serial typer" to write it back into the other system. https://www.youtube.com/watch?v=sV3NBAmFd8A Alternatively, I'm still learning how to do input/output on those rear-side external pins. -Steve / v* On Mon, Oct 16, 2023 at 2:47 AM Christian Corti via cctalk < cctalk(a)classiccmp.org&gt; wrote: