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Cool, I'm glad it was useful - I just did it for fun. I think a flaky P/S killed several chips on this Apple, so I'm currently using 4 wall warts to power it until I replace the caps.

The Apple ][+ I got in 1980 had 48K with Integer BASIC in slot 0, and this one has a language card. I didn't realize how big of a hassle that is- all programs lock out reset, so you have to cycle power.

So I bought a prototyping card and built a multi-ROM switcher. Hitting reset jumps to code that waits a couple of seconds for you to press a digit from 1-7 and selects the chosen ROM image. If you don't press a digit, the last-chosen one is selected again. Pressing 8 clears RAM first. That way I can always break out, and either reboot or exit to the monitor.

I'm going to add a big SRAM to it and have it emulate one of the bigger RAM cards.

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I decapped an SCUS0488 LCD controller from Milton Bradley Microvision: www.seanriddle.com/scus0488.html

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I uploaded the Canon Multi 8 calculator info: http://www.seanriddle.com/tms1000.html#multi8

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Canon Multi 8 added to MAME and working, thanks =)

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Excellent!

I got a Sears Electronic Numbers Game. It has a 22(!) pin DIP labelled 69-10768A EIA 7939. I'm guessing it's a custom.

I've also got a couple of TMS0117s coming. They are pre-TMS1000 calculator chips that were used as math coprocessors. So the segment outputs are used for BCD and status instead.
https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19750006665.pdf

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The Numbers Game chip is a custom. The only info on the die is "MC121".

Incredible Brain Buggy arrived: TMS1000NLL MP0915 MS^7923
It's simpler than Big Trak; up to 24 steps of forward, left, right or stop, each for 1/2 to 2 seconds.

There are quite a few TMS chips on ebay: MP0190, MP3301A (Big Trak!), MP1276, MP1185, MP0158 (Entex Soccer), MP1122, and more.

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The original one is Bandai システムコントロールカー チーター
System Control Car: Cheetah

TMS0100 series is the 1st TI calculator MCU, used for example in the Datamath(TI-2500). We don't emulate it yet in MAME.

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I uploaded the info on Entex Space Battle and Incredible Brain Buggy: http://www.seanriddle.com/tms1000.html#brainbuggy

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Great smile I'll have them emulated soon.

For the buggy, how are the motors hooked up when steering? Does 1 wheel simply spin faster than the other?
Could you make a top-view photo of Space Battle PCB? This is to get the LED coordinates right in the internal artwork.

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There's one motor in the back that drives the back tires and one in the front that turns the front wheels left/right. The front motor is on an h-bridge so it can turn either direction, but the back one can only go forward. There's a spring on the front wheels to keep them straight when the car's not turning.

I added pics of the Space Battle PCB and the case.

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