Subject: Re: [stella] baubles.bin v0.001, was Re: Stella Photoshop colorpalette and question From: "B. Watson" <atari@xxxxxxxxxxxxxx> Date: Sun, 9 Sep 2001 03:39:58 -0400 (EDT) |
Partial Success report... I've now got a cart board (made of a dead Pitfall cart) that I can plug a 27256 into, with any game burned to the first 4k of the EPROM, and it will actually play on a 2600... What I actually did was to solder a 24-pin socket into the 24 pins on the cart board, then plug a 28-pin socket into that, with selected pins bent out so they don't make contact (the 27256, like most (all?) other EPROMs, has an active low chip enable, and also has a separate active low output enable. The /OE pin is where A11 would normally go...) The thing looks awful, it's a patchwork of jumper wires and hot glue, I think I'll call it FrankenCart... The next steps (not necessarily in this order): - Fix my colortwk.bin so it works on a real Atari (works fine in PCAE and z26...) - Wire DIP switches with pull-up resistors to the top 3 address lines, so I can use the rest of the EPROM. - Play lots of River Raid!!! - Build a bank-switched version for 8k rom images. - Get back to work on my crappy game, make it non-crappy... For the bank-switched version... I don't know the standard way to do this, but I have a few 13-input AND gate ICs, and lots of invertors, so I should be able to wire all the address lines to the inputs of the AND gate (and the unused input to Vcc), and invert the appropriate ones, until I have a gate that will trigger when the magic memory location is accessed. Then I need a what, a flip-flop or something, to control the A12 line of the chip? My roommate and I built this thing together, he's in the other room trying to build another one, with DIP switches, right now... So I should go help. Adieu, Brian --- If a trainstation is the place where trains stop, what is a workstation? - Archives (includes files) at http://www.biglist.com/lists/stella/archives/ Unsub & more at http://www.biglist.com/lists/stella/
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[stella] baubles.bin v0.001, was Re, Jake Patterson | Date | [stella] sorry bout that..., B. Watson |
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