ZX-81 bonus material and retrogaming! (Pimp My Eight, episode 4, part 4)

Pimp My Eight, Episode 4, Part 4:
A second ZX-81 has been pimped! Includes a tutorial on how to upload software into the ZX-81 via the audio port using a modern computer, phone or MP3 player, as well as plenty of really retro retrogaming.
CHECK OUT www.thebyteatt... FOR MORE.
USED IN THIS EPISODE:
USB headset adapter: Delock USB Sound Adapter 7.1.
MY KIT:
Weller WE1010 soldering station
ZD-915 digital desoldering station
Owon SDS1102 oscilloscope
Brymen BM235 multimeter
ZD-129A desk lamp with magnifying glass and 80 LEDs
Kontakt IPA spray can 600ml
Contact cleaner Kontakt S (step 1) and Kontakt U (step 2)
Aoyue 486 solder fume extractor
EP9993501 USB microscope
Ecobra 760 300 fiberglass pen
RS Pro (251-3637) no-clean flux pen
Jokaru Super 4 Plus wire stripper

[@gregskuza7166]

I sooo agree with you with the educational part of the ZX81. My first computer was a ZX81 with 16kb and I had no software for it but BASIC and imagination and it was everything I needed as a 10 year old kid.

[@XenonJohnD]

I love the low res version of the Gerry Anderson S.H.A.D.O UFO Interceptor in that game you were playing, which had a large missile attached to it's front end. That Sci-Fi series was set in the future - 1980, good choice of inspiration for a ZX81 game.

[@lizziedavis1618]

What a beautiful little computer, amazing job on the upgrades!

[@thebyteattic]

Cheers!

[@Spider_Rico]

This is amazing! I wish I could have this done to my Timex Sinclair 1000.

[@thebyteattic]

Thanks!

[@stickybandit2346]

Could not find any free software on RWAP. And you can solder a joystick jack to the keyboard connections.

[@joefish6091]

It would nice to have a new larger keyboard and case for ZX81 and Spectrums. Just a generic retro 8bit case and unwired keyboard.

[@pablopicaro7649]

Someone must have developed a method to directly load the SRAM with program data. It was done by Commodore long ago, with the 1541 disk drive (that was more powerful then then Vic20) .

[@eriksteckelbruck7586]

Do you have any information onto which pads you have to solder the RAM pins in a Issue One ZX81 ? You are the first person I notice that is using pads on top . Thanks in advance

[@thebyteattic]

Those are VIAs. Regrettably, no, I don't think I have an issue one.

[@eriksteckelbruck7586]

@@thebyteattic ah I thought the ZX81 RAM upgrade you are showing in this video is an Issue One PCB ?

[@thebyteattic]

Sorry, I mistook the video you are commenting on. Those are indeed pads, the ones used by the diode array. I show where they are in the previous episodes of this series, just have a look there.