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Thread: TMNT Repair Log

  1. #11
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    Cheaper programmers cant generally do non Jedec standard roms (I think it was Jedec). A simple example is a 2732 vs a 2532 with an adapter you can program 2532's as 2732's.
    The same goes with a 27c4096 to AM27C400 a simple adapter can be used. Most inexpensive modern programmers can do the more common 27C4096 which are not pin compatible with the AMD AM27C400. Its very confusing with the 4 meg 16 bit roms because some brands can be called 27c400 and have the same pinout as the 4096 and also not to be confused with the 8 bit variant.

    Never heard of or used adapters with dip switches to program these.

  2. #12
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    Quote Originally Posted by Arcade King View Post
    Never heard of or used adapters with dip switches to program these.
    See post 2 in this thread Along with this guide to using it. The guide is for a SNES rom on a 160 or 322, but the principle is the same. You get your larger rom and use a hex editor or rom utility to split it into 512kB chunks. Dip switches are for address lines A18, A19 and A20. 27C400 roms don't use any switches bar the chip-type switch being set away from 322. 27C800 chips use A18 (two chunks of 512kB), 27C160 chips use A18 and A19 (four chunks), and for the 27C322 chips you throw the type switch over to change the wiring, and use all three dips. You just have to remember where you're up to when programming.

    There are at least half a dozen different types of 27C4096 to 27C400/800/160/322 adapter out there. I bought one that turned out to be in beta, and had to redesign a chunk of it :/ You can make cut down version of the adapter with fewer switches to handle whichever chips you want, of course. It just seemed easier to me to get the 322 one so you can do them all.

    These would be standard version of these chips, i don't know anything about the 27C400 variants you're talking about. I've been programming SNES roms and Amiga kickroms with mine.

  3. #13
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    Yeah never had to do that luckily. Any byte swapping I can do with the programmer software or Hex editor and never had to do that with arcade roms.
    I get what you mean now though.

  4. #14
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    Quote Originally Posted by buttersoft View Post
    See post 2 in this thread Along with this guide to using it. The guide is for a SNES rom on a 160 or 322, but the principle is the same. You get your larger rom and use a hex editor or rom utility to split it into 512kB chunks. Dip switches are for address lines A18, A19 and A20. 27C400 roms don't use any switches bar the chip-type switch being set away from 322. 27C800 chips use A18 (two chunks of 512kB), 27C160 chips use A18 and A19 (four chunks), and for the 27C322 chips you throw the type switch over to change the wiring, and use all three dips. You just have to remember where you're up to when programming.

    There are at least half a dozen different types of 27C4096 to 27C400/800/160/322 adapter out there. I bought one that turned out to be in beta, and had to redesign a chunk of it :/ You can make cut down version of the adapter with fewer switches to handle whichever chips you want, of course. It just seemed easier to me to get the 322 one so you can do them all.

    These would be standard version of these chips, i don't know anything about the 27C400 variants you're talking about. I've been programming SNES roms and Amiga kickroms with mine.
    Yep, what he said.

    I wanted to get some practical experience in designing PCBs so that was the main reason I drew up the schematic and did the board layout.
    Namco Starblade - Taito Cocktail 14" x 3, 20" x 2 - NZ SI PtII Upright - Chase HQ DX, Taito Top Speed - Taito Grand Champion - Taito Safari - LAI SI Head to Head Cocktail - SI Cocktail Clone x 2, Pong Clone x 3

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