View Full Version : Value of the TI99/4?

April 2nd, 2009, 09:42 PM
I have in my "collection" a Texas TI99/4, I know that these are a bit harder to find than the more common TI99/4A but my question is how much harder? The 4A model doesn't fetch any remarkable sum of money when sold so how much more should I expect to get if I sell the TI99/4?

April 3rd, 2009, 04:21 AM
I've seen 4's go anywhere from $50 to $250 on ebay seemingly for no reason than they did! Same condition, same accessories, basically the same machine!

To me, a decent price for a decent condition working machine would be around $75-100.

Of course, the value of a particular machine is determined by how much the buyer is willing ot pay and how much the seller wants.

Good luck if you decide to sell it.


April 3rd, 2009, 04:55 AM
Several factors affect the value of a 99/4. Early in the production run there were a couple of variants that did not last long. All of these used a different power supply and most of them had a slide switch instead of the Solid State Software label at the front of the cartridge port. The slide switch was for the internal speaker under the grille behind the cartridge port. This was dropped pretty fast. All total, TI sold something in the vicinity of 50-75 thousand 99/4s, according to a news article I read back in 1981 on computer market share. The article concluded that there was no good reason to buy one because there would never be much of a third-party software market for a machine with such low sales numbers.

Condition and presence of the original box also make a difference--very few 99/4 boxes survived, so they've become somewhat of a collector item.

As Curtis noted, $75-$100 is a good range for the later versions, with the earlier ones with the cartridge port slide switch going for closer to $200. I have both major varieties in my collection.

One other item of note: machines with manufacture date codes in 1979 are usually higher priced in their category than those with later codes, and both varieties were in production together until at March 1980 at a minimum, as my slide switch keyboard was made at the beginning of that month.

April 4th, 2009, 10:05 AM
Thanks a lot for your answers!

April 9th, 2009, 10:09 AM
One just sold within the last 2 days on Ebay for around $85 in good condition.