27 Apr
2010
27 Apr
'10
12:14 p.m.
Tony Duell wrote:
It does not. The DSK85 does bit bang through the SID and SOD pins
on the 8085 CPU.
On Monday
(04/26/2010 at 06:31PM +0100), Tony Duell wrote:
Yes indeed. That will be plan B if Dave is unable to read his 8355 in
his PROM programmer.
The tty interface on this SDK-85 was built for 20mA current loop so I'll
have to either rework that to RS232 or invent a new method to offload.
But not a big deal really.
I would be _very_ supprised if that serial interface doesn't sue some
TTL-level serial chip (or bit-banged through a TTL level port) followed
by a current loop interface.
I
don't suppose anyone has a spare 8355 with SDK-85 monitor burned in
it do they?
Alas not. But if the device works if you cool it, can't you read it
out
when it's been cooled? Surely the SDK-85 has some kind of I/O port
you could dump it to. And then burn the bits into an 8755 as you suggested.
In which case, since you need output only, grab the
TTL leve signal at
the input to the coverter and feed it into something like a MAX232 (or a
1488 if you have +/-12V suppleis around).
No need. The SDK can be via jumpers wired with run RS232 levels
for terminal. A minus 5 to 12 Volt supply is required but we are
talking a few milliamps.
The intel i8085 manuals had the schematic for the SDK85.
Allison
-tony