30 Jan
2002
30 Jan
'02
2:42 p.m.
--- Pete Turnbull <pete(a)dunnington.u-net.com> wrote:
My PDP-8/E uses 12V or 14V bulbs, running off an 8V
(nominal) supply.
Yes... different bulbs, different circuits.
Other models may very well be different, though.
The PDP-8/E uses TTL logic. The R-series stuff does not. The
supply rails are +10VDC and -15VDC... not the same.
The pre-TTL stuff apparently uses 28VDC bulbs with a wire base,
running off a nominal 12VDC. They obviously learned something
from their early products.
-ethan
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