27 Apr
2010
27 Apr
'10
2:34 p.m.
On Tuesday (04/27/2010 at 06:58AM -0700), Glen Slick wrote:
On Mon, Apr 26, 2010 at 4:01 PM, Glen Slick
<glen.slick at gmail.com> wrote:
Yes... Thanks again Glen. I haven't gotten back to the project but will
soon.
And Tony, you are correct on the serial interface. It is sourced by the
SOD pin of the 8085 and then a single transistor drives the current loop.
You need to invert this before feeding into a 1488 or equiv RS232
driver but that's no big deal. All the TTY I/O runs at 110 baud,
timed by busy loops in the firmware but that's not a problem either.
There's a routine in the ROM called "co" which will bit-bang chars out
the interface as well as one called "nmout" which outputs ascii-hex bytes.
But, since Glen sent me the ROM image, I'm set with the bits. Now just
need to burn an 8755.
Thanks again for the help guys.
Chris
--
Chris Elmquist
I was able to dump the 8355 and reprogram it into an 8755 for an
SDK-85 I have. ?I should be able to send you a dump for that later
today if someone else doesn't beat me to it.
I sent Chris a binary dump of the 8355 from my SDK-85. I haven't
uploaded it anywhere yet. If anyone else needs a copy I could send it
to them, or upload it somewhere.