On Wednesday, May 7, 2025 at 0:50, Steve Lewis via cctalk wrote: > But back on the original Wang question: I still can't find high > resolution images of it's CPU board. According to 1991 discussion here > on the 2200B, there is also mention of the system not really having an > instruction set, BASIC was all it could do since it was "hard wired."
Section 4 of the "2200 Systems Maintenance Manual" here: http://www.wang2200.org/docs.html ...contains the theory of operation of the CPU. Subsection 4.2 is the "General Instruction Set Description." The BASIC interpreter is contained in ROM providing 20-bit instructions that are executed by the hardware. The "Wang 2200 CPU schematics" here: http://www.wang2200.org/schematics.html ...show that the ALU is a single 74181, implying essentially a 4-bit processor. -- Dave
