bradleyb
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Posts posted by bradleyb
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Ah, I surmised something like that back in the day, but saw that my newly acquired speech synth had nothing that looked remotely like any provision for a connector on the board.
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On that note, are there any prototypes or pictures or rumors of other peripherals that would have used the same mold as the black/silver speech synth? what would that little door have ever been used for?
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Well it turns out that my disk controller (PHP1240) is bad. I swapped in another one and the floppy fired right up!
I'd like to figure out what's wrong with the first card though. maybe I can find the fault easier since I have a good one to compare with.
The PEB voltages are still too high though, so I won't be doing much with it until I can fix that. I'm going to start by replacing all the electrolytics.
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I unplugged and opened up my disk controller card, and noticed that the voltage regulators were still warm. On a hunch I checked the voltage on the PEB's bus, which I believe are supposed to be around +/-16V and +8V, and I found them to be more like +/-23V and +13V. Is that way too high or not a problem?
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If you're getting rid of the black keycaps, can I have your old CTRL key?
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OLD DSK1.TEST, results in no light on the drive, very brief flash on the controller, and an immediate I/O error 00
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I disassembled the whole PEB and cleaned it out, it had been stored in the original foam-lined cardboard box from TI, and there was little bits of foam everywhere. After reassembly, SIZE reported the expanded memory!
Still getting error 00 on the drives though. I was just going to ask about about the power requirement, because the 12V on one of them is powered by an external AC supply and rectifier board inside the case. I have the original documentation for the QUME kit and it describes setting it up and everything. The belts both look ok. The heads move freely as well.
I used to be familiar, I had one as a kid
Never had a PEB or any drives though. -
I just picked up a TI and PEB. While the console appears to work great, I haven't been able to get any of the expansion boards to work.
The PEB includes:
Flex cable interface
32x8 memory expansion
RS232 interface
Disk controller, with dual floppy drives (QUME 142)
When powering the PEB on, both floppies' spindles turn for a few seconds. Trying to access either floppy drive as described in the manual results in a brief flash of the disk controller's LED, but no activity on the floppy light, and a disk error 00.
Using the SIZE command only results in 13928 bytes free.
I imagine there is an easy way to do a loop-back test on the serial port, I just haven't found any instructions yet.
I'm wondering if these are common symptoms for a PEB that's been out of commission for a while, and what I should try next?
Thanks!
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PEB troubleshooting
in TI-99/4A Computers
Posted
I don't have Mini Memory, no. I'm still trying to figure out the darn PEB voltage problem. I replaced the capacitors, but there was no change.
I saw this at Thierry Nouspikel's page: "All voltages will be lower if cards are still present inside the box (approx +8, -16, +16V) than in a bare PE-box (+13, -25, +25V). This is normal."