Either the chip will be an MX1000QC-12 or a AM27C512 you will need to dissassemble the rom pack (just unclips or pops apart) from here you need a 32 pin PLCC adapter and a tl866 (link here). Once the ROM pack is open pop out that chip that is socketed it will be the ROM.
Use a RGBtoHDMI, make sure you have a pi Zero. Next is a matter of finding a screen that fits so in this case I believe this would work. What you will be doing is taping into the video signal in the analog board to feed a video signal to the RGBtoHDMI, from here its as simple as plugging in the...
Okay so here's something interesting, I disassembled the TechStep and have taken photos. From what you can see there are no SMD electrolytic capacitors ,they are all tantalums stock from Apple. Also fun fact the TechStep has a FPU it is a Motorola 68882. Something else I want to point out is...
Thank you I really appreciate it, everyone has worked hard on this. I wanted to win a prototype to see what all is different on the prototype ROM's and units but I imagine very little change except for maybe the devices name which was originally the TechTool before being replaced with TechStep...