Reverse engineering vintage PCBs (wrt: 3B2 main board schematics)

Al Kossow aek at
Fri Jan 9 09:54:40 CST 2015

On 1/9/15 8:12 AM, Alan Hightower wrote:

> There doesn't seem to be any archived copy of the AT&T 305-490 "3B2
> Computer Technical Reference Manual" anywhere nor any indication if it
> included board schematics. Beyond that, I cannot find a hint of anything
> previously archived that would have schematic level information on any
> 3B2 computer. That's why I'm doing this.

In post-processing the I/O bus spec, I see there is a block diagram of the CPU
board in there

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