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About flip

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    Chopper Commander

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  1. Hi, Bad RAM is one possibility, but one or more bad ROM chips is also a possible. Do you have any cartridges you can try? If that works, it would mean that the lower ROMs and RAM are OK. If you have the multicart, this can actually replace the entire ROM set and if that works, it would mean the RAM is OK. If no cart works, you'll need to look at replacing the RAM... It'd be happy to help out, if needed. Let me know... FliP
  2. [I thought I had answered this, but it seems to be missing, so maybe I forgot to submit?!?] anyway, your system has a faulty RAM chip - the Studio II has a whopping 512 bytes of RAM. Half of this is working memory - the other half is for the video. They're 4-bit chips, meaning you need two of them for 8 bits: one handles bits 0-3 and the other one 4-7. One of the ones that handles the video is broken, so that you only see half the bits drawn. It's an easy enough fix, if you know how to (de-)solder. You'll need to source a CDP1822 (or equivalent). If you can't find one for a reasonable price, let me know and I should be able to help... I forgot which chip it is on the mainboard, but I can find out if you're planning to try and fix it. FliP p.s. it's unlikely a faulty power supply caused this - these chips are 40 years old and can fail...
  3. I'd be very curious to see how that could be done: it does not seem to possible to add extra RAM via the cartridge port (R/W signal is missing for example). Short of putting nearly the full system (including the CPU) on a cartridge, it doesn't seem very feasible. At best, it would be a very crippled Cosmac VIP, with < 512 bytes RAM to play with? FliP
  4. Yes - it’ll work just fine without a shell... PM me for more details though i’m travelling over the WE so i will probably only reply somewhere next week! FliP
  5. And there's no pre-order list, nor will there be one.
  6. Awesome - that one works like a charm! Thanks. FliP
  7. Has anyone managed to put Loderunner on a flash cart? Is it possible it uses some weird and exotic block size that's currently not supported? Or am I missing something? cheers, FliP
  8. if you have 10 shells left, any colour, i'd be happy to add them to the pi hat order FliP
  9. Hi, The Visicom is actually substantially different from the Studio II (and the color clones) in both hardware and software, despite using the same processor and video chip as the Studio. You might be disappointed with the MPT-02's joysticks: they simply sit on top of the keypad, which in itself is a lot worse than that of the Studio... The multicart is still available, as @stupus pointed out without a shell. PM me for details... FliP
  10. Hi, Long shot, but does anyone have a good quality photo of the inside of an MPT-03 console? Cheers, FliP
  11. The photo has a revision 'B' mainboard, meaning it is very probably a pre-production one. The earliest ones i've seen, the #131 (iFixit teardown) and #155 are revision 'C' boards... The datecode on the CPU (7640) suggests it was put together after week 40 in 1976. Interestingly, two of the ROMs have different serial numbers: 84932 & 84933 are the same as in production machines, but the game roms are 84934 and 84935 - in production machines, they were 85456 and 85457... And the pixie chip has handwriting on it, suggesting it also was a pre-production! Cool find! FliP
  12. Don't think that was ever a condition for the multicart... everyone can have the design, files and all but I asked that they would not be sold commercially. Wouldn't count selling off a single one in an auction as 'commercial'... FliP p.s. congrats on the baby - sad that you have to sell stuff, but i'm sure it'll be worth it!
  13. The multicart hardware itself is still available... Don't think i've posted anything to the contrary? The only thing I don't have is shells/boxes: you'll have to provide your own, but it comes with stickers for the shell and a little manual... FliP
  14. Awesome work on the Test Cart, ED - no wonder it needs a beefed up power supply with all those extra chips... I assume it switches back and forth between the on board ROM and those on the cart to compare them... For the multicart: perhaps you missed the post above, but by patching 4 bytes, you can get the tester to run on the multicart. These are the patches needed, assuming the test cart starts @ 0x0400 0x0417 0x43 --> 0x07 0x041F 0x42 --> 0x06 0x0422 0x40 --> 0x04 0x0601 0x41 --> 0x05 I've attached a patched binary of the test cart that runs on the multicart - it runs all the tests, but gives an error for the roms, depending on whether these are mapped to the cartridge or to the onboard chips... So it doesn't check the full hardware, but the ram and keyboard tests should work... FliP
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