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

[Al Kossow]

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