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11 April 2026

UniPak 2B pinout module 351B-104BD repro

Written by S11
The Data I/O 29 series is a vintage line of high end EPROM programmers, which had various programming pack options including the UniPak 2B with ZIF sockets for some specific device types and a swappable pinout cartridge – it...
Read More about UniPak 2B pinout module 351B-104BD repro
Tech / Repair
05 February 2026

BeebJoy programmable joystick interface for BBC computers

Written by S11
I grew up at a time where the BBC Computer Literacy Project was in full swing. It was a joint effort between the UK government and the BBC who worked with Acorn to develop a machine aimed at educational...
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Games, Tech / Repair
14 August 2024

Cheetah “Sweet Talker” speech add-on for ZX81

Written by S11
My first computer was a ZX81, even at the time it was rather outdated and only one other person at school had one, but it’s what we could afford and I loved it. Very much a hobby / enthusiast...
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General
15 July 2024

Nichibutsu X-Rate DVD system footage (NSFW)

Written by S11
The X-Rate system very similar to the High Rate system, but the IDE control / video playback board is replaced with a board which controls a DVD player via IR pulses, similar to the much older VHS and Laserdisc...
Read More about Nichibutsu X-Rate DVD system footage (NSFW)
Arcade, Games
13 July 2024

Blog restored

Written by S11
Well it’s back, but I had to update loads of components and replace the theme, everything is “kind of there” but I need to fix all the video links by hand one article at a time and check all...
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General
04 January 2024

Iskra 122 (12x?) series calculators – PCB expander / transit board

Written by S11
The Iskra 122 is a 1970s-80s Russian industrial & scientific calculator which uses nixie tube displays.  I’ve repaired and restored a couple, but one PCB I’ve been struggling to fix.  Since the board live in a densely packed cage...
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Tech / Repair
15 October 2023

Hardware macro click mouse with variance (Nikke)

Written by S11
There are plenty of mice with macro functionality on the market, some very precise or with full step sequences, but none that I can find allow you to add variance and if you ask the companies or on support...
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Games, Tech / Repair
29 May 2022

Toshiba SD-B100 DVD information / service / repair

Written by S11
The Toshiba SD-B100 DVD player is the model used by Seibu CATS video mahjong systems (and some Konami bemani games), it’s a broadcast quality unit actually designed by Sanko supporting serial control.  There’s an IR receiver present but as...
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Arcade, Tech / Repair
15 May 2022

Old scans added to the archive

Written by S11
I found some scans I hadn’t actually processed and uploaded from before the scanner failed – just added them!  
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Arcade
21 April 2022

Irem (ELNA) capacitor update – Madonna cabs

Written by S11
If you have an Irem Madonna cabinet you’ll find that there’s a credit board clipped to the left side of the coin box casing – M79. It’s got the same problem as the game boards, two were bad on...
Read More about Irem (ELNA) capacitor update – Madonna cabs
Arcade, Tech / Repair
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