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Type: Posts; User: hjalfi

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  1. ...the solenoid hasn't failed. It just doesn't...

    ...the solenoid hasn't failed. It just doesn't like buck regulators.

    The plotter has (had) two 7805 5V linear regulators attached to a gigantic heat sink. I thought one had failed, so I removed...
  2. I've figured out that applying pressure to the...

    I've figured out that applying pressure to the stepper motor shafts in a particular direction cause the motors to start working again (suggesting a defunct bearing). Unfortunately, now the pen load...
  3. Update: the stepper motors appear to have failed....

    Update: the stepper motors appear to have failed. One of them grates when it rotates and I measured the torque on the other one and it's 0.4 mN.m, which is way way too small. I think the bearings...
  4. Alps mini plotter stepper motor not stepping

    I've just acquired a Tandy CGP-115, mint in the box, one of those ubiquitous four-color ALPS plotters which are so fiendishly unreliable. Mine doesn't work, of course, otherwise I wouldn't be here,...
  5. 6us for the step pulse width? That's... bigger...

    6us for the step pulse width? That's... bigger than I thought. And a closer look at the datasheet shows that the 1us figure is the minimum width. I also notice that the drive actually steps on the...
  6. I've tried it with and without terminators, in...

    I've tried it with and without terminators, in both positions in the cable, and with and without a 3.5" drive in the other slot. It behaves the same both ways. I have not tried it with a different...
  7. Stepper motor problems with Panasonic JU-475 floppy drives

    I took the FluxEngine to VCFe Zurich the other day --- only to discover that both my 5.25" floppy drives had failed, in the same way: grating noises while stepping the head, in that very...
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    It lives! Aha! Aaahaaa! That deblocking code...

    It lives! Aha! Aaahaaa!

    That deblocking code was *horrible*, and I spent ages tracing down heisenbugs which I *think* were due to a bad filesystem... I reran my mkfs tool, after fixing the bugs,...
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    I believe there's one report that the motor...

    I believe there's one report that the motor started but no data showed up on the controller, and one report of nothing happening at all, but the user reports were moderately vague so it's hard to...
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    User has said that they've tried two 5.25" drives...

    User has said that they've tried two 5.25" drives and two 3.5" drives, with similar results for both. I've asked them to check whether the 5.25" drives have explicit termination.

    My PSoC5 board...
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    What's with FDD cable termination?

    I've had two FluxEngine (<plug> http://cowlark.com/fluxengine </plug>) users report cases when a single drive would not respond to the controller, but two drives on the same cable would. This sound...
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    Oh, yeah, I forgot that (it's not actually in the...

    Oh, yeah, I forgot that (it's not actually in the 'documentation', and that bit is marked as reserved). However the motor doesn't actually come on when the program runs and it's cached.

    sfx: looks...
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    Even with the floppy drive motor off it still...

    Even with the floppy drive motor off it still chatters a little during a card read. I believe this is the stepper motor jittering.

    Sadly I've discovered that a CF card in Fuzix is out of the...
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    Bah, turns out you have to multiply attribute RAM...

    Bah, turns out you have to multiply attribute RAM addresses by two, but not common RAM. So I was writing to all the wrong IDE registers... It now works; I can initialise and communicate with CF...
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    Well, the good news is that I took the lid of my...

    Well, the good news is that I took the lid of my NC200, removed the card slider, and with a little programming I can now positively identify ATA PCMCIA cards via the attributes and when I read from...
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    They showed me a picture, and yes, it's a PCMCIA...

    They showed me a picture, and yes, it's a PCMCIA adapter. There's plenty of space inside the NC200 itself and the only modification is removing the cover because the bulge in a PCMCIA II card won't...
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    Compact flash on the Amstrad NC200

    So someone just emailed me regarding my CP/M port to the NC200 saying that they managed to plug a Compact Flash card into the thing --- turns out that it fits fine if you remove the plastic case....
  18. Is there a decent S100 emulator, allowing virtual...

    Is there a decent S100 emulator, allowing virtual cards to be installed, configured, etc?
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    Dial-up BBSes in Switzerland?

    Have a genuine acoustic coupler, plus a handset which will fit it; I'd love to try it out and see if it works. However, I live in Switzerland with ruinously expensive international call rates, and...
  20. Thread: Epson PX-8

    by hjalfi
    Replies
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    3,298

    Curses, yes. I recapped it, all except the bit...

    Curses, yes.

    I recapped it, all except the bit 3300uF capacitor which I couldn't find a replacement for, and there's no change in behaviour (the default firmware is ignoring incoming bytes);...
  21. Thread: Epson PX-8

    by hjalfi
    Replies
    24
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    3,298

    Huh, I thought TTL was TTL --- I have approximate...

    Huh, I thought TTL was TTL --- I have approximate knowledge of the digital stuff, but not so much about analogue. My datasheet for the AT28C64 doesn't have any explicit figures for impedance; what...
  22. They record digital signals on multiple channels....

    They record digital signals on multiple channels. The one I linked to streams data to a PC via USB, so it'll record an unlimited amount of data. Connect it to the data bus and you get a complete...
  23. Thread: Epson PX-8

    by hjalfi
    Replies
    24
    Views
    3,298

    Update: I got myself a AT28C64 EEPROM, pin...

    Update: I got myself a AT28C64 EEPROM, pin compatible with the PF-10's EPROM, and put some test code in it. This has confirmed that the UART is, in fact, working --- I can send bytes to the board,...
  24. Hey, I was just talking to someone on Reddit with...

    Hey, I was just talking to someone on Reddit with one of these! (/jk)

    I can't offer any additional advice but I can strongly recommend the cheap Chinese logic analysers like these:...
  25. Thread: Epson PX-8

    by hjalfi
    Replies
    24
    Views
    3,298

    Crazy thought: assuming the rest of the CPU's...

    Crazy thought: assuming the rest of the CPU's fine (the actual CPU bit works, but I don't know about the peripherals), I could patch in my own UART via the exposed address and data lines in the EPROM...
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