Commodore VIC-20: replacing the kernel ROM

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Australia The Clueless Engineer
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Published on ● Video Link: https://www.youtube.com/watch?v=waSm8kAird8


Duration: 15:14
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When watching YouTube on a computer, the "L" key is your friend ... skips 30s ahead ;)

"Quick" video on how to use a 23-to-27 adaptor board to replace the 2364 kernel ROM in your VIC-20 with a 27xxx EPROM ... in this case a 27c128 with the original 8KB kernel as well as JiffyDOS.

Extra bonus ... using a CMOS EPROM reduces power consumption and heat (those 2332 & 2364 ROMs get damn hot!).

Normally I would also solder on a socket for the 27128 but as I was installing this in a VIC with PET-style keys, the ROM adaptor board would've been too tall. So I had to solder the 27128 EPROM to the adaptor board directly (after first programming it).

SukkoPera's 23-to-27 ROM adaptor:
https://github.com/SukkoPera/Open2327RomAdapter

JiffyDOS purchase/download:
http://store.go4retro.com/jiffydos-vic-20-kernal-rom-overlay-image/

Retro Innovations also do a 2364 replacement board:
http://store.go4retro.com/rom-el-2364-flash-rom-replacement/

Replacement decals:
https://www.etsy.com/shop/lukparts



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Tags:
Commodore
Commodore VIC-20
VIC-20
JiffyDOS
VIC20
Commodore VIC20