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Also has a pair of DRAM chips near the disk controller.

https://en.m.wikipedia.org/wiki/The_Mosquito

Jameco have them at a reasonable price https://www.jameco.com/z/74S181-Major-Brands-4-Bit-Arithmetic-Logic-Unit-Function-Generator-DIP-24_48514.html

They're also available in half can size

Ebay link (seller is in us) https://www.ebay.co.uk/itm/203731600546

Here's the schematic, unfortunately the power connector doesn't have a part number.

Wireless world August 1983 had a project to add serial printer capability to an olivetti praxis typewriter

For me PCBs are cheap enough nowadays to have more than one spin, but sometimes wirewrap is a quick way to try out an idea

4 layer boards aren't too expensive nowadays, but 6+ layers are considerably more. Also with 4 layers you have a reasonable chance that mistakes can be fixed with a cut and strap. If I was designing this I'd probably go with 4 layers. One inner layer for 0V, the other inner layer for power...

For 74 series chips the following applies The CD prefix was traditionally Harris but they were acquired by Texas some time ago. The E suffix on a CD part is the same as an N on a SN part. Different manufacturers may have slight differences in the performance which you can find by comparing...

Previously on the VCF forum https://forum.vcfed.org/index.php?threads/commandex-keyfax-videotex-terminal-keyboard.1239255/

It does look like a keyboard for a viewdata system, a phone style keypad along with call and hangup keys. The surprise key is unusual though.

Also appears in 1991 spring/summer https://christmas.musetechnical.com/ShowCatalogPage/1991-Sears-Spring-Summer-Catalog/1477

1990 Sears Christmas catalog page 660 has the SR 1000 printer, it seems this was a Sears branded printer https://christmas.musetechnical.com/ShowCatalogPage/1990-Sears-Christmas-Book/0660

They ar soldered into the pcb. Try searching for CR2430 tagged cells, Google only wants to show me uk suppliers but here's an example https://uk.rs-online.com/web/p/button-batteries/1882133

Looking up the FCC data on that label I get the following FCC IDENTIFIER: AKX28YC-130SK Name of Grantee: Shinwa of America Inc Equipment Class part 15 Class B Computing Device Peripheral Grant date was 08/30/1988 So the printer in the ebay listing was made by Shinwa but has been rebadged...

While browsing ebay I saw this, it has 4 buttons on the right one of which is blue and the smoked cover comes almost to the front. https://www.ebay.co.uk/itm/404397756223?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=5OfiY-LZQuy&sssrc=4429486&ssuid=zwa3JGfGRy-&var=&widget_ver=artemis&media=COPY

Lichess allows computers to play human players if you create a bot account https://lichess.org/blog/WvDNticAAMu_mHKP/welcome-lichess-bots

It also claims DEC bought Data General in 1999, in reality it was EMC who bought Data General.

They do still exist, this is company in the UK which I used a kit from years ago. https://www.intertronics.co.uk/product/crc201-1402-land-repair-kit/ Here's an ebay link for something similar, I'm sure there must be a North American importer...