Kalawsky / Zero 18 40/80 column card

[TNT]

I bought the aforementioned 40/80 column card a while ago and finally had time to test it out. Unfortunately I don't have the manual so what better way to reveal it's secrets than to disassemble the ROM.

You can find the EPROM dump, disassembly and text file describing startup keys, SYS commands and some additional information at http://sid.fi/~tnt/vic20/zero18/

I will add some images of the board as soon as it's out of the oven as I wanted to clean it up a bit first

[eslapion]

I was asking if there is similarities between this cart and the Data20 / Protecto 80 which also happens to use a 6845 CRTC chip.

Apparently my post was deleted...

[TNT]

You asked at Lemon64

Different board layout, pretty much identical support chips which isn't surprising given MC6845's design. Zero 18 uses more glue logic.


If someone wants to add any of the information to Denial wiki then feel free to do so.

[TNT]

Wiki page 40 and 80 column boards updated. I also uploaded the charset EPROM contents to http://sid.fi/~tnt/vic20/zero18/