4 Dec
2011
4 Dec
'11
2:49 p.m.
For the compopsite output, fit 10uF or 47uF capacitors
in the 2 spaces
hidden by the modulator. Reduse the series resistor in the compostie
signal (I think it's R9 on the PCB) from 1k to 220 Ohms. Fit a DIN socket
Actually it's R8, I misremembered last night.
in place of the RF output socket (the fibreglass
insualtor of the latter
can be drilled out take a single-hole mounting DIN socket) and wire the
pins to ground, the right hand hole of R5 (audio) and hole E (video).
[..]
Another thing that would be useful, but I probably can
figure this out,
is the ppinout of the DA15 printer conenctor. It's clearly TTL level
parallel. There are 2 output ports, one 8 bits (data I assume), one 2
bits (I guess one of thsoe is strobe, what the other is I don't know) and
3 inputs (one is conencted to a pusle-stretcher, adn is prsumably Ack/,
one of the others is probably Busy).
I've doen a little more testing on thsi. By monitorign the 2-bitoutputs
and groudnign the inputs (TTL, so they float high), I think the ouptus
are Stv/ and Init/ (pulsed low briefly at the start of every printer
operation). The inputs seem to be Ack/, Busy and some kind of Error/
signal (Paper Out/ perhaps).
I;ev yet to wire up a cable from a DA15 plug to a 36 pin microribbon
plug, but that's something to do i ntyhe enar future. Then I can be sure
my connections are OK.
I still can't figure out how to set the numbers to dial though. Any ideas?
-tony