21 Oct
2015
21 Oct
'15
11:48 a.m.
On 2015-Oct-21, at 3:19 AM, Rod Smallwood wrote:
VT 100's have one weak point. The monitor is a
bought in part from Ball Bros.
The Ball supplied drive board burns up a diode and cap. It will be obvious on inspection
of the board.
I have never been able to get a circuit diagram or I'd do a replacement board.
Needless to say the DEC parts are mde of sterner stuff
The VT100 FMPS from bitsaver's:
http://www.mirrorservice.org/sites/www.bitsavers.org/pdf/dec/terminal/vt100…
has schematics for two different monitor boards (pages PDF.43 & PDF.58), the first
indicated as being from Ball Bros.
Does that cover it?
Dates on the Ball Bros version look like 78, while the other looks like 79.
(Anecdotally: didn't have any problems with the power supply or monitor on the VT278
when it was powered up after many years.)