Subject: Re: [stella] EPROMs From: "B. Watson" <atari@xxxxxxxxxxxxxx> Date: Mon, 3 Sep 2001 02:25:16 -0400 (EDT) |
On Sun, 2 Sep 2001, Mark De Smet wrote: > The letter mixed in there can lead you the programming voltage. If > talking about 2732's, there are generally 3 types, 2732, 2732A and 27C32. > All three have different programming voltages. 2732 IIRC is 21.x V, 2732A > is 12.5V, and I think 27C32 is also 12.5V, but not sure(I wouldn't tell a > programmer that you have a 2732A if you are using a 27C32 though) > Hmm. The manual for my programmer (GTEK 7228, old as dirt I think), lists a bunch of manufacturers, and which menu option to choose for them. My 2732's are ST (SGS-Thompson) M2732AFI, which isn't listed in the manual. However, M2732 and M2732A are both listed, and they use the same menu option. Also the chips have `21V FAST' printed on them. I've been told that you can't permanently damage an EPROM by using too low of a programming voltage, so I will probably try 12.5 volts if I can figure out how. All you really get to do is choose a part number from a menu, which selects appropriate voltage, timing, and whatever else, for that chip type, but I don't see a way to tweak individual parameters. > voltage above that rated for the eprom. Unless your programmer is very > old, it should be able to handle all of the above types, with the > appropriate setting. Usually via the pc(either through pc program, or This thing looks pretty old. However, I got a great deal ($20) and a pretty large supply of 2716's, so once I get one of those programmed, I'll be ready to try one of the bigger chips. When writing a 2600 program for a 2K EPROM, I assume the 2K gets mapped to $F800-$FFFF? I was thinking of writing a small demo in 2K, so when I do get a cartridge board built, I won't blow up a good EPROM if I wire it wrong or whatever. > > Hope that helps, > Mark It does. Thanks. 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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