OldSkool Computer Cartridges/expansions/add-ons

Last Updated or created 2024-02-12

(Todo : add photos/designs )

Amiga:

Action Replay IIOwned since … 80s 90s?

Modded this one, as part of my modular
amiga system where i wanted to remake
every part onto 10×15 euro prints. So i could
swap things out for other boards.
Memory expansion512k .. missing in action
Go a new one in … ?
Boot selectorSwaps df0 and df1
DIY version was a wirewrap ic socket with a cross switch, now i have a Gotek buffered switching module with can be actvated with a keystroke.
(Gotek post)
Keyboard modHidden key (in the space of the stands, which triggered a extra key stroke)
Kickstart selectorA print you can insert in the ROM socket of your amiga. Had only 1.2 and 1.3.
Now there are many .. like diagnostic roms.
I made a altered 1.2 version .. which was unusable .. i f*cked it up
SID modAdded a sid parallel on the 8020 CIA chip
Gotek driver emulatorI made a arduino version to read disks. (Other post)
But this is a disk image drive emulator.
See Gotek post
Boot sector warnPiezo beeper which warned me when a boot sector was being written (virus alert)
Sound filter fixAmiga audio filter enhancer, using capacitors and resistors

C64:

Final Cartridge III
Led modMemory activation leds
KCS Power CartridgeSepp’s old cartridge?
Rom selectorDIY rom selector
Data Manager 2Can’t find anything on this one on other sites !?!?!
https://www.henriaanstoot.nl/2022/07/17/mystery-cartridge-c64/

Atari:

Vic-20:

Reset modDIY reset mod
ROM selectorDIY ROM selector
Many cartridgesSold in 2022, kept only some useful once’s

PC:

PC speaker modSpeaker to audio jack
Seek time monitorWhen a seek took too long, LEDs would light up, time to defrag!
Covox modA pre sound card parallel to audio resistor bridge.
Only a few demo’s and games supported this mod.
VGA to scartDisplay hack
VGA to Scart hack

Monitor:

Monitor modDIY horizontal flip using relays
Color modGreyscale / RGB switcher

Generic:

Joystick recorderrecorded movements when playing a game, so it could replay parts.