a808@mindlink.UUCP (David R. Matthews) (04/11/90)
Maybe I'm off base, but I know that there are devices made specifically to convert parallel signals to serial, and serial to parallel. I have purchased a device to convert serial to parallel and tried to no avail to get it working. Maybe with a device like this and some well written software, you would have more luck than myself. If you like, I could find a supplier for these units. Again, maybe I'm off base.
gt4662b@prism.gatech.EDU (BRANHAM,JOSEPH FRANKLIN) (04/11/90)
In my quest to try and hook up an external terminal to my 1000, someone gave me a great idea. He claims that the parallel and serial ports on the 1000 are driven by two identical chips. What I'd really like to do is this: make a little board which plugs into where the chip which drives the parallel port which can make my parallel port act like a serial port at the flip of a toggle switch. Questions: 1) Does anyone know how much off-base this idea is? 2) Can anyone recommend sources of material about these chips and this section of the circuit board? Thanks in advance, -- <------------------------------------------------------------------------------> < FRANK BRANHAM | "I exist; therefore I am." > < Georgia Institute of Technology | -The Patchwork Quilt > < Internet: gt4662b@prism.gatech.edu | by August Derleth >
grr@cbmvax.commodore.com (George Robbins) (04/12/90)
In article <7881@hydra.gatech.EDU> gt4662b@prism.gatech.EDU (BRANHAM,JOSEPH FRANKLIN) writes: > In my quest to try and hook up an external terminal to my 1000, someone gave > me a great idea. He claims that the parallel and serial ports on the > 1000 are driven by two identical chips. > > 1) Does anyone know how much off-base this idea is? Pretty far. The modem control lines for the serial port are handled by one 8520, as are the parallel port data and control lines, however the actual serial transmit and receive data are handled by the Paula chip. This is a unique resource so your switch doesn't seem feasible. -- George Robbins - now working for, uucp: {uunet|pyramid|rutgers}!cbmvax!grr but no way officially representing: domain: grr@cbmvax.commodore.com Commodore, Engineering Department phone: 215-431-9349 (only by moonlite)
jms@tardis.Tymnet.COM (Joe Smith) (04/12/90)
In article <7881@hydra.gatech.EDU> gt4662b@prism.gatech.EDU (BRANHAM,JOSEPH FRANKLIN) writes: >In my quest to try and hook up an external terminal to my 1000, someone gave >me a great idea. He claims that the parallel and serial ports on the >1000 are driven by two identical chips. What I'd really like to do is this: > make a little board which plugs into where the chip which drives >the parallel port which can make my parallel port act like a serial port. > 1) Does anyone know how much off-base this idea is? Your friend had incomplete information. The serial port transmit and receive data is handled by Paula, the custom chip that also handles floppy-disk read and write, audio output, and analog joystick I/O. The parallel port is driven by one of the 8250 chips. The other 8250 chip is identical, but is connected to the slowly-changing RS-232 signals; DTR, RTS, CD, CTS, DSR, RI. You would be better off buying a multi-port serial board. -- Joe Smith (408)922-6220 | SMTP: jms@tardis.tymnet.com or jms@gemini.tymnet.com BT Tymnet Tech Services | UUCP: ...!{ames,pyramid}!oliveb!tymix!tardis!jms PO Box 49019, MS-C41 | BIX: smithjoe | 12 PDP-10s still running! "POPJ P," San Jose, CA 95161-9019 | humorous dislaimer: "My Amiga speaks for me."
valentin@cbmvax.commodore.com (Valentin Pepelea) (04/12/90)
In article <7881@hydra.gatech.EDU> gt4662b@prism.gatech.EDU (BRANHAM,JOSEPH FRANKLIN) writes: > >What I'd really like to do is this: > >make a little board which plugs into where the chip which drives >the parallel port which can make my parallel port act like a serial >port at the flip of a toggle switch. You can find serial to parallel and parallel to serial converters from multiple sources. The price ranges around $40. Pick up a copy of Computer Shopper and look around. Valentin -- The Goddess of democracy? "The tyrants Name: Valentin Pepelea may distroy a statue, but they cannot Phone: (215) 431-9327 kill a god." UseNet: cbmvax!valentin@uunet.uu.net - Ancient Chinese Proverb Claimer: I not Commodore spokesman be