Been trying too get some serial communication working between my Tandy 102 & TI-99/4a. Have been doing these sorts of projects for years. The null modem cable I use works with my Tandy 102 with:
- Transferring files to and from Android using a USB OTG cable, a disk emulator called mComm on my Android Nexus 5, USB->Serial converter, null modem cable
- Transferring files to and from Ubuntu Linux using an app called desklink, USB->Serial converter, null modem cable
Am fairly confident my null modem cable is a good one. Got a website detailing some of the stuff interfacing the Tandy with things over the years (seriously needs an update)
Idea was too try & transfer a TXT file stored on a DSK file on the CF Card of the nanoPEB to the Tandy 102.
First step was too put each machine into Terminal mode to see if I can echo out commands in full/half duplex on both machines.
I set up the Tandy to receive in 38N1D, which is 300 baud, send chars using 8 bits data, No error checking parity, 1 pulse at end of each char, disable remote control of data output. Then set the Tandy 102 TELCOM app into Terminal Mode
I then tried both the Terminal Emulator II and the Mass-Transfer 4.3 application on the XB 2.7 module.
- Terminal Emulator II - 300 baud, No parity, tried Full and Half, RS-232 #1 in terminal mode
- Mass-Transfer 4.3 - 300 baud, RS-232 #1, trying different combos of line feed toggle, echo etc in terminal mode
I literally get no response at all at either end. No data is transferred between either.
What are the changes the RS-232 on the nanoPEB is faulty? Can anyone see any obvious issue with my settings? Does the TI need a special null modem cable?