korn0051 Posted December 29, 2019 Share Posted December 29, 2019 Hi everyone, I've been piecemealing together a full 4A system for a couple years now, and my latest addition is leaving me stumped. I've searched through the forums and didn't see anything that quite answers my questions, so I'll throw it out here if there's an expert that knows. I have the PEB with the RS232 card. The cord is a 25-pin (at the PEB) to 36-pin (at the MX-80). All seems good and well, I power up the MX-80 and get the POWER, READY, and ON LINE lamps. But when I turn on the PEB, the READY lamp turns off. Another oddity: if I disconnect the TI-99 from the PEB and turn on the PEB, the READY lamp stays on. I'm guessing it is either an issue with the pinout of the cord or the DIP switch settings on the MX-80's main board. Any recommendations of cables or DIP settings from others that have the MX-80? Thanks! Aaron Quote Link to comment Share on other sites More sharing options...
+arcadeshopper Posted December 29, 2019 Share Posted December 29, 2019 Hi everyone, I've been piecemealing together a full 4A system for a couple years now, and my latest addition is leaving me stumped. I've searched through the forums and didn't see anything that quite answers my questions, so I'll throw it out here if there's an expert that knows. I have the PEB with the RS232 card. The cord is a 25-pin (at the PEB) to 36-pin (at the MX-80). All seems good and well, I power up the MX-80 and get the POWER, READY, and ON LINE lamps. But when I turn on the PEB, the READY lamp turns off. Another oddity: if I disconnect the TI-99 from the PEB and turn on the PEB, the READY lamp stays on. I'm guessing it is either an issue with the pinout of the cord or the DIP switch settings on the MX-80's main board. Any recommendations of cables or DIP settings from others that have the MX-80? Thanks! AaronThe cord should be this one for centronicshttps://iec.net/product/ti99-4-parallel-printer-cable-5/25 pin is serial not parallel on the TI card the parallel port is below itSent from my LM-G820 using Tapatalk 1 Quote Link to comment Share on other sites More sharing options...
atrax27407 Posted December 29, 2019 Share Posted December 29, 2019 You are trying to connect the serial port (25 pin) to a Centronics parallel interface (36 pin) on the printer. Any standard Centronics parallel cable will work assuming you have it plugged into the parallel interface on the RS232 card. Quote Link to comment Share on other sites More sharing options...
+Vorticon Posted December 30, 2019 Share Posted December 30, 2019 You need a special parallel printer cable with the proper connector for the RS232 card parallel port. You can purchase one here: https://iec.net/product/ti99-4-parallel-cable-to-smith-corona-printers-5/ Quote Link to comment Share on other sites More sharing options...
Omega-TI Posted December 30, 2019 Share Posted December 30, 2019 It appears you cannot save any money with Hello Cables this time. ? I've got one that's been sitting in a closet for years. I'll probably never use it again. Quote Link to comment Share on other sites More sharing options...
+Ksarul Posted December 31, 2019 Share Posted December 31, 2019 You actually want the standard printer cable for an EPSON, not the Smith Corona or Okidata cables. The latter two had some logic in the cable to reverse polarity of some of the control signals (Hold, IIRC) and to synthesize some of the missing control signals. Bonus is that it costs less. . . 1 Quote Link to comment Share on other sites More sharing options...
Ed in SoDak Posted December 31, 2019 Share Posted December 31, 2019 (edited) 42 minutes ago, Ksarul said: You actually want the standard printer cable for an EPSON. . . Wow, that's almost identical to the one I put together 30-some years ago (Pic is from iec link above). Not a bad price either, plus you don't have to look up the pinout or strip and solder the fine ribbon conductors. -Ed And my tagline seems unusually appropriate here in this thread. Edited December 31, 2019 by Ed in SoDak 1 Quote Link to comment Share on other sites More sharing options...
+Vorticon Posted December 31, 2019 Share Posted December 31, 2019 10 hours ago, Ksarul said: You actually want the standard printer cable for an EPSON, not the Smith Corona or Okidata cables. The latter two had some logic in the cable to reverse polarity of some of the control signals (Hold, IIRC) and to synthesize some of the missing control signals. Bonus is that it costs less. . . Did not know that. Thanks for the info Quote Link to comment Share on other sites More sharing options...
korn0051 Posted January 2, 2020 Author Share Posted January 2, 2020 Thanks everyone for the cable advice. I have a parallel/parallel cable on order. I'm thinking between that and the patchy documentation on DIP switches that should solve the issues. Once I have the cable and get the DIP switches set, I'll post that for the next poor soul trying to connect devices. 1 Quote Link to comment Share on other sites More sharing options...
fabrizio Posted January 5, 2021 Share Posted January 5, 2021 On 12/31/2019 at 3:59 AM, Ed in SoDak said: Wow, that's almost identical to the one I put together 30-some years ago (Pic is from iec link above). Not a bad price either, plus you don't have to look up the pinout or strip and solder the fine ribbon conductors. -Ed And my tagline seems unusually appropriate here in this thread. do you have the schematic of this cable ? 1 Quote Link to comment Share on other sites More sharing options...
+arcadeshopper Posted January 5, 2021 Share Posted January 5, 2021 http://www.mainbyte.com/ti99/hardware/cables/printer.html Quote Link to comment Share on other sites More sharing options...
+acadiel Posted January 5, 2021 Share Posted January 5, 2021 I’m looking for a serial card for one of these if anyone has one not being used. Quote Link to comment Share on other sites More sharing options...
GDMike Posted January 6, 2021 Share Posted January 6, 2021 20 hours ago, fabrizio said: do you have the schematic of this cable ? Same here, just like what I had. Must if been popular. Quote Link to comment Share on other sites More sharing options...
Ed in SoDak Posted January 7, 2021 Share Posted January 7, 2021 Sorry! I wired it up in the mid-'80s using the Epson and TI RS232 manuals. If there's anything, at best it's a handwritten note in the bottom of one of the boxes containing bits and pieces of my old TI stash. Easier to dig out the cable, open the printer connector and trace wires. 1 Quote Link to comment Share on other sites More sharing options...
Omega-TI Posted January 12, 2021 Share Posted January 12, 2021 I have a bunch of things taking up space that I want to get rid of (as a package deal only). Contents: 1) An RS-232 cable. I do not know which printer it works with, so you'll probably have a 50/50 chance of it working out of the box. 2) A TI RS-232 Y-Cable 3) A Lantronix UDS-10 with power supply. 4) A modified TI RS-232 card you'll have to perform an operation if you want it to run as RS232/1 again. CLICK ON IMAGE TO ENLARGE VIEW If you're interested, and live in the lower 48 states, send me a PM. I'll let it all go for $150.00 (which includes shipping). Sorry, PayPal only. Everything was working when I pulled it from my system after I switched to the TIPI. Quote Link to comment Share on other sites More sharing options...
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