Neat drawing. I see the LT1081 is obsolete, basically a RS232C to TTL dual transiever IC. One needs to find an alternative.
LT1081 Specs
I would use a Max 232 for the above it is a direct pin for pin replacement and there are lots of them available.
MAX 232 to LT1081 Alternative
Maybe I ought to build one and prove it seeing we still have a toshiba in production in our plant.
I would google the Max232 for lots of circuits and base it around the very well drawn circuit of jrwb4gbm
LT1081 Specs
I would use a Max 232 for the above it is a direct pin for pin replacement and there are lots of them available.
MAX 232 to LT1081 Alternative
Maybe I ought to build one and prove it seeing we still have a toshiba in production in our plant.
I would google the Max232 for lots of circuits and base it around the very well drawn circuit of jrwb4gbm