23 Apr
2016
23 Apr
'16
5:46 p.m.
I think you two are talking different versions of the Elf: Eric is talking specifically
about the Elf 2000 whose circuit design has been modified considerably from the original
version Dwight appears to be referring to.
For my part, when I refurbished a period homebrew implementation (someone's high
school project) I relabeled the switches to indicate all 4 of the functional states of the
2 switches rather than the somewhat inexplicable "LOAD" and "RUN".
http://www.cs.ubc.ca/~hilpert/e/cosmacElf/index.html
On 2016-Apr-23, at 4:09 PM, dwight wrote:
Lf it were mine to make, it would be a spring return
momentary SPDT. NC would be ground and NO would be +5V,
as per the schematic.
I'm not sure what the manual says about it.
It is debounced with a jam latch, as per schematic.
Tinker Dwight
________________________________________
From: cctalk <cctalk-bounces at classiccmp.org> on behalf of Eric Smith
<spacewar at gmail.com>
On Sat, Apr 23, 2016 at 11:28 AM, dwight <dkelvey at hotmail.com> wrote:
I looked at the schematic pdf and it looks
right.
The ground lead is the NC.
It's an SPDT toggle. Neither the NC or NO pin of the switch should be
tied to ground; it's the common pin that's grounded. So for a toggle
switch, which side is NC and which is NO?
Anyhow, apparently if I'd read it more carefully, it is explained in the manual.