VTech Precomputer 1000 schematic

 I stumbled across the VTech Precomputer 1000, learned that it's based on a z80, and looked for a schematic. I couldn't find one, so I took a crack at drawing one myself. I haven't validated it, and there are some things still to figure out, so consider it a rough starting point.

DrumFire DF500 Schematic

    Here's one more analog drum schematic that I've redrawn. I worked from the drawing found here, and changed the layout for clarity.