View Full Version : Ti 99/4

December 31st, 2017, 09:33 AM
Grabbed this right away as my last purchase of 2017:

https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.com%2Fulk%2Fitm%2F22 2776287475

I think this is a pretty awesome deal.. esp. if the monitor is included, but even if not. I cannot remember what the last original 99/4 sold for, but I figure if the 4a is worth $20-30 then I paid $70 for it.

Have asked for clarification on the monitor.. I think that is why the shipping was $80.

January 3rd, 2018, 04:57 PM
Neat, nice score! I see 4A's come up locally now & then but have never seen a /4. They're definitely a lot rarer. Hope that monitor survives the shipping intact if it does get sent.

Also I had no idea the North Pole was in Alaska :P

January 3rd, 2018, 05:27 PM
You'd prolly pick on someone round here who didn't know where Vancouver island is...

I hope for that price that you got the monitor, all the necessary accessories, and that everything works.

I had enough experience with a /4 when they were new that I can't fathom having one now. Even the /4A frustrates me because I have an idea how much better it could have been. I do kind of wish that I had a PEB and space for one.

January 3rd, 2018, 07:46 PM
Definitely a good price for the /4 all by itself. They usually go for between $180 and $220 each, without the monitor. That is the original Panasonic /4 monitor too. Those are usually about $100 each, sometimes a bit more.

stephen frey
January 4th, 2018, 07:45 AM
I had a TI99/4. Was my first computer that I didn't build from scratch. Around $1100 in 1979 as I recall. But I got some of the expansion modules. Eventually had the 32k memory, the dual serial port, the disk drive controller with two drives, and the speech module. I did a lot of programming with the system. Got the Editor/Assembler, extended BASIC, LOGO, Multi-Plan, and a bunch more. Did most of my programs in the extended BASIC. When the TI99/4As were selling at a reduced price so I got one of those and that is what I actually used the most. Gave the /4 to my sister's son and after he grew up and moved out she got rid of it. Wish I had known she would do that before hand. would have got it back. One of my claims to fame is the development of Graphic Programming, now called function block programming in the HVAC industry. Where you create programs but placing symbols representing functions like AND (logic gates.., SIGNAL selectors (MUXs or switches and Hi Lo signal selectors), ADDERS, (math functions...) PID control, Analog and Binary Inputs, Analog and Binary Outputs, Analog and Binary Variables etc on the screen and connect them to represent a diagram of the control system you want to produce. The Graphic Program Generator is then run and it produces the program for that control system which is then loaded into the controller. That is the way most control programs are produced in the HVAC industry today. The TI99/4A was good for this because of the graphics capability. You could do sprites and you could make your own characters. I used the extended BASIC and created my first GPG system. I later listed it out to the serial port and captured the program on an IBM PC. Corrected for some of the differences and produced a version in IBM BASIC, then Microsoft BASIC, then Quick BASIC then Visual BASIC. I now sell an upgraded VB version that works on Win 98 through Win 10. It is a general purpose Graphic Program Generator that can produce just about anything depending on the attribute files associated with the symbols used in the drawings. I used the TIs for controlling LAB experiments by building interfaces that worked over the serial ports. I used it as a terminal for other computers for a while and also built an EPROM programmer for it that I used to program a lot of home brew and work computers. I wrote several assemblers and disassemblers for various microprocessors using it. So I could write programs for the 8048 series controllers for instance. So, the TIs have a special place in history for me. I have two TI99/4As and all the expansion modules still and get them out for STEM events on occasion. The built in BASIC is a good first programming experience for the students.

January 4th, 2018, 08:39 AM
So the seller, who has 0 feedback.. msged that he could not produce a shipping label or something with paypal and cancelled the order, and wants me to paypal him directly.. hmmm

January 4th, 2018, 12:55 PM
So the seller, who has 0 feedback.. msged that he could not produce a shipping label or something with paypal and cancelled the order, and wants me to paypal him directly.. hmmm

Sounds very fishy...