28 Apr
2010
28 Apr
'10
2:41 p.m.
On Wednesday (04/28/2010 at 07:51PM +0100), Tony Duell wrote:
I agree with you Tony. I have the original schematics that were included
with the board (and printed on 11x17 sheets), they match the schematics
in the manual for the board, and do not show any RS232 option. There is
a section in the book that shows how to wire up a 1488 and 1489 to build
such a converter but there is no place on the SDK85 board to do that.
They use one of the 1489 receivers as an inverter before driving the
TxD out one of the 1488 transmitters.
Anyway, probably beating a dead horse against a brick wall now as I
have verified the .bin file that Glen sent matches the listing in the
manual byte for byte so I have the bits I need. A couple 8755A are
in the mail and when I get those, will be good to go.
Thanks for the help.
Chris
--
Chris Elmquist
Yes, but the
SDK85 design you could jumper the IO for
RS232, 20ma or TTL.
OK, I am being dense... The schematics I have (which I will admit is
printed in a book, it's not an Intel original, but it does say
'Reproduced by permission of Intel Corporation') doesn't appear to show
any such links. It just shows 1-transistor buffer stages connected to the
SID and SOD pins.
Can you point me at a schematic of the SDK85 that does show these
jumpers, please.