7 May
2025
7 May
'25
8:23 p.m.
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