Also, I'm a bit confused by the OR/AND/XOR instructions -- the encoding says that you can pick R0, R1, R2, or RS (3), but I cant' find anything in the docs explaining what RS is.  The docs for KEYSTATUS mention RS3 at the top, but that doesn't seem to match the register description.

Now I'm confused - sorry, I wrote the manuals two years ago so I don't remember about details. Instructions OR/AND/XOR RX,RY work with all 16 registers equally and OR/AND/XOR R0,N with R0 only. Coding for R0,R1,R2,RS are valid for bit test/set/reset/toggle instructions only, but they are explained there (the bottom of pages). Please give me a pointer. (I guess that you are talking about 2 Instruction Set book?)

RS is OUT or IN register (0x0A or 0x0B) depended on the data flow (writing or reading). If the bit IOPos (WrFlags,1) is set, then OUT and IN are on addresses 0xFA and 0xFB. This was explained in SFR docs, WrFlags (0xF3).

You're right -- I mean the bit instructions, I just got confused in posting the question.  I missed the diagram that explained the OUT/IN register use because it didn't use the term RS again, so my text search in the document failed to find it.

Hi, @Voja Antonic!  In the Rev2 SFR docs, the diagram for SFRF2 (Sync) is the same as the one for KeyReg. Can you update that with the correct version?

Corrected, thanks! If I didn't miss something, it was the error in register name, and the rest of the page is OK.

Hey Voja, is there an easy way to contribute to the docs? I can help fix typos/spellings

Thank you, Matt, it would be great! My English is awful, so you can help a lot! There are three possible ways to do it:

1. The easiest way is to edit text in Acrobat, but I think that you would need Acrobat PRO then.
2. All docs were created in CorelDraw and then converted to PDF. So if you have Corel, I could send you CDR files.
3. Use Redact mode in Acrobat to note all modifications and errors, so that I can correct them.

What do you think?

None of those options are good for me. Does this work for you? It's a shared google drive of the pdf, with comments enabled.

https://drive.google.com/file/d/1ilunbteJH7hmsRhtUm11dk3dljxXaPH8/view?usp=sharing

I have added a few comments - can you see them? Hopefully you will also be able to make a fix on your doc and then comment them as completed (leave them open so I know I've already marked them)

btw the quality of the datasheet is very high, and your English is very good. There are only a few things to change

Great design - looks super !!! :)
This badge is getting popular on Twitter right now ;)
20K+ impressions just from my account and counting :)
200+ likes and 36 retweets for the 1st twit in the thread:
https://twitter.com/Shaos1973/status/1580307109622599680

> it is still "on hold"

not anymore !

https://hackaday.com/2022/10/12/the-2022-supercon-badge-is-a-handheld-trip-through-computing-history/

You are right. Corrected!

TTLer People at https://hackaday.io/project/8449 ask if it could be implemented in TTL chips.

OF COURSE.

Why not in tubes and relays too :)

exercise left to the reader ;-)

Actually while not a badge, someone did make a small'ish relay computer that could be a breastplate armor - The "SBC Relay Trainer" the CPU is made of 82 DPDT relays.

I look forward to buying one of these in the near future! Absolutely awesome. Voja's projects are inspirational and I learn a lot from them. This will go to the left of my Heathkit Microcomputer Learning System, which looks forward to a Monster 6502 showing up on the right side some day!

Oh, you're in for a treat at 2022 Supercon.