TimBuk2

[Timkorbs]

So I just bought a peripheral expansion box for my ti 99 4a. It has three cards including the 32k expansion. When I power the unit up, it keeps trying to access the disk drive continually and I can see that the 32k expansion light keeps coming on. when I pull the 32k expansion out and start it again, the disk drive initializes and stops running like it should. I can actually run programs that require the 32k expansion, but it keeps trying to run the disk drive and will not stop. I've opened up the expansion card and cleaned it and examined it but I can't find any problems. Any ideas on what I can do?

[+arcadeshopper]

14 hours ago, Timkorbs said:

So I just bought a peripheral expansion box for my ti 99 4a. It has three cards including the 32k expansion. When I power the unit up, it keeps trying to access the disk drive continually and I can see that the 32k expansion light keeps coming on. when I pull the 32k expansion out and start it again, the disk drive initializes and stops running like it should. I can actually run programs that require the 32k expansion, but it keeps trying to run the disk drive and will not stop. I've opened up the expansion card and cleaned it and examined it but I can't find any problems. Any ideas on what I can do?

Likely one of the 72ls chips is bad.. others will know which ones to check. easiest way to solve it is likely to replace them all with sockets and new chips till it works.. 

[Timkorbs]

I've never done that kind of work before. Does anybody know where I can find some instructional training and how that could be done? Thank you!

Edited October 18, 2020 by Timkorbs

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You'll definitely want to find a dead board to practice on before committing to do this yourself!

 

Not sure if either video mentions the need to keep soldering times short, as not to overheat the I.C.'s internal connections. Good practice is to wait a little while between pins.

[Timkorbs]

Thanks!