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That makes sense!
So as LN, that makes you a dip in a plastic package? smile

Sometimes the codes before the date code include the die revision (DBU, WE, DGU, for instance), but many don't.

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A fellow with a power supply with a bad MC6805P2 found my notes on dumping Milton and emailed me a few more questions. Then he built a board that clones MC6805P2s to MC68705P3s: https://github.com/SandboxElectronics/MC6805P2_clone

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I got a Caprice Pro-Action Baseball game, which has a GI PIC 1655A-043, and an Acclaim 1943 LCD game, which probably has a Sharp SM5xx.

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Great smile I'll increase the priority on my imaginary TODO list for developing the PIC16 handheld driver.

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Been busy with work, but picked up an Electronic Stratego with a COP421L-JLE and a Waddingtons Wizard (full size) with a Toshiba TMP4310.

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Last year I ordered the patent wrapper for US4322074A, which has a ROM dump of the Mattel game Gravity. I also ordered the patent wrapper for US4162792A, which covers Auto Race and Football. That one has 6502 source code for the prototype of the Football game, but some data tables are missing and there's no description of the hardware.

I emailed the person whose name is on the printout, and he replied and told me that he custom-built the prototype and wrote the code himself, but was hesitant to send me any of the missing files.

I figured out the hardware by reading through the code, then built one. I filled in the missing pieces of code and fixed typos until I got it to work. There are still a few tweaks to make and some features could be added, but it plays pretty well.

I put all the info here: http://www.seanriddle.com/footballproto.html

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Originally Posted By seanriddle
I emailed the person whose name is on the printout, and he replied and told me that he custom-built the prototype and wrote the code himself, but was hesitant to send me any of the missing files.


That's odd, American engineers dating *that* far back tend to be fairly forthcoming with information - compared to their corresponding Japanese analogues, at least.

Oh well, the fact that you homebrewed up a "replacement" is still heroic.

PS. Your homebrew remake can possibly be preserved in MAME too, guidelines regarding non-arcades tends to be looser. See the 4004 Nixie Clock as an example. wink

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Yeah, I was hopeful he'd send stuff, but I respect his wishes. He was nice to reply in the first place. Dumb me, I didn't think then to ask any technical questions or see if he had any pictures. I emailed him a few days ago with a link to my page and asked, but I haven't heard back this time.

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Originally Posted By Stiletto
That's odd, American engineers dating *that* far back tend to be fairly forthcoming with information - compared to their corresponding Japanese analogues, at least.


Indeed. This being one recent example.

I will say that pretty much no source outside of what's in the patents has escaped Mattel Electronics to my knowledge - everyone there was unusually tight about that stuff. Apparently there's tons of it in Intellivision Productions' warehouse (including their 2600, Coleco, Apple II, and IBM PC ports), but they have Flashback consoles to sell so they aren't giving it out. The ex-programmers are usually willing to chat about technical details at length on the Intellivision podcast (and sometimes they mention the handhelds), but no source.

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Originally Posted By seanriddle

http://project-megs.blogspot.com/ ... shows Parker Bros Wild Fire with a TMS1400! I picked up another one recently and it has an AMI S2152 like the first one I got. The first one didn't work and I wasn't able to dump it, but this one works so I'll try to dump it again.

I inverted the SYNC output with a 4049 and connected it to the ROMS input, and the chip dumps the first 1K of ROM bytes (but nibble-swapped: outputs D7-D4 are ROM data bits D3-D0 and outputs D3-D0 are ROM data bits D7-D4). I haven't figured out how to dump the other 1/2K yet. The first 1K is identical to the ROM image in the patent.

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