From: William Levak (wlevak_at_sdf.lonestar.org)
Date: 2008-07-12 06:20:25
On Mon, 7 Jul 2008, Ethan Dicks wrote:
> I don't mind drawing up schematics of the innards with something like
> EagleCAD, but I don't have a wiring diagram. Is that something that
> you might be able to provide as well? The docs I just read mentioned
> one chip inside besides the ROM, so it shouldn't be too complicated
> to describe.
I have traced out most of the non-6545 test device. The data lines and
a0-a10 go from the clip to the two ROM sockets. a13 and a14 are tied
directly to ground with no resistors. a11, a12, and a15 are controlled by
the 74LS138, and diode. I have not completely worked this out yet, but the
ROM sockets are for 2 2K ROM's.
The reset switch is between ground and the reset line.
The LED is in series with a resistor, between ground and +5V, and is just
a power indicator.
wlevak@sdf.lonestar.org
SDF Public Access UNIX System - http://sdf.lonestar.org
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