Pico Garry 2350 Part 4: Memory Read Select
Following on from the previous part in this series I now turn to /ROMEN and /RAMRD signals, collectively called Memory Read Select. When the CPU wants to read from memory the gate array has to decide whether that read should come from RAM or ROM. This decision is based on the memory bank being accessed …. Read More
CPC ZERO Part 0: Intro, CPU and ROM
Reverse engineering the Amstrad CPC Revision Zero PCB made me wonder exactly what a 6502 based Amstrad would look like. So I have begin a project, which I’m calling the CPC ZERO, to design such a machine. The prototype PCB is so broken that it doesn’t give much of a starting point for a system, …. Read More