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Old Yesterday, 10:12   #21
hooverphonique
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Quote:
Originally Posted by Nightshft View Post
I searched and found a picture of the AR1 pcb, which I took in 2021. I then sold the cart, so sadly I can't take more pictures or remove the 4 stickers.

As already stated the two 27c256 are 32kB Eproms. "-20" probably means 200ns iirc. Back then I read them and I remember that the contents exactly matched (same hash) the AR1.bin file that's floating around the web (for usage with Winuae I think).
On one of the chips with stickers, "PAL" is peeking out, so those are probably the 4 PLD's I called above.. So it looks like the mk 1 is a through hole part version, and the later ones surface mount. They probably added an extra PLD for some fixes/features.
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Old Yesterday, 13:45   #22
Jope
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Quote:
Originally Posted by Nightshft View Post
I searched and found a picture of the AR1 pcb, which I took in 2021. I then sold the cart, so sadly I can't take more pictures or remove the 4 stickers.
It looks very similar in design to the ProAccess http://amiga.resource.cx/exp/proaccess.

Two 8kx8 SRAMs and a pair of EPROMs to get 16 bits of width.

Also both had the FDOS disk format, the codebase must have been rather similar
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