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Re: Microdrives not working and now neither oqtadrive
Posted: Wed Jun 22, 2022 10:22 am
by Ruptor
bola_dor wrote:how can I rule out the ZX8302 ? I have a cheap handheld oscilloscope that can help (up to 20Mhz)... ( I think I should borrow a better one if I have to check the crystal)
And check RAW signals look OK and get to the destination on oscilloscope since those were the bent pins. 20 MHz is old gear that is good enough for this old tech.
Re: Microdrives not working and now neither oqtadrive
Posted: Mon Jun 27, 2022 1:16 am
by bola_dor
xelalex wrote:Hi Ernesto,
could you run the OqtaDrive daemon with debug log level and do a dir mdv1_ or a load and post the log here or send via PM? Maybe we can infer something from that.
And to clarify, you have OqtaDrive connected to the external connector, removed the internal drives, and bridged COMMS IN to COMMS OUT in both internal drive connectors?
If you haven't done already, also set DRIVE_OFFSET_QL to 0 in oqtadrive.ino, just to rule out that automatic offset detection is misbehaving.
Alex
Hi Alex,
I'll try to get the log.
QL is identified properly. just for the test I mounted an mdv image to all units mdv1 to mdv8.. just in case.
I didn't bridge any pins anywhere at the internal connectors...
But it did work at least once like that.
Exactly what pins should I link? I don't remember seeing that on the documentation but gives me some hope....
Re: Microdrives not working and now neither oqtadrive
Posted: Mon Jun 27, 2022 1:20 am
by bola_dor
Ruptor wrote:bola_dor wrote:how can I rule out the ZX8302 ? I have a cheap handheld oscilloscope that can help (up to 20Mhz)... ( I think I should borrow a better one if I have to check the crystal)
And check RAW signals look OK and get to the destination on oscilloscope since those were the bent pins. 20 MHz is old gear that is good enough for this old tech.
I'll see to that!!!!
It's a handheld Hanteck. Not old but cheap
I've used it extensively with the Spectrum an zx81 clones I have. Is just I saw the related Crystal being about 32Mhz...
Re: Microdrives not working and now neither oqtadrive
Posted: Mon Jun 27, 2022 3:31 am
by bola_dor
Well there you have it..
The orange wire from conector mdv1 pin1 to conector mdv2 pin 2 re-established the connection from ZX8302 pin 34 to 4A on the microdrive external connection.
Also checked for continuity from pins 19 and 21( the one previously bended) to 1B and 1A ...
And
It worked!!!
It was easier than I thought thanks to your gide!!!!
Now I am happier than a two tailed dog
Re: Microdrives not working and now neither oqtadrive
Posted: Mon Jun 27, 2022 8:06 am
by xelalex
Cool!
Happy to see it working. I'll add a note to the project README, that points out the need to bridge the two pins when removing drives from a QL.
Re: Microdrives not working and now neither oqtadrive
Posted: Mon Jun 27, 2022 9:58 am
by Derek_Stewart
Hi,
If the link wire is not installed, does that mean, the Oqtadrive can not be mapped as MDV1 or MDV2, only being able to use MDV3-MDV8?
Re: Microdrives not working and now neither oqtadrive
Posted: Mon Jun 27, 2022 10:07 am
by xelalex
Without the bridge, the drive daisy chain is broken, and nothing would work, be at OqtaDrive or an external real drive. For example, if you remove MDV1 from the QL and don't bridge pins 1 and 2 in its PCB socket, MDV2 will stop working.
Re: Microdrives not working and now neither oqtadrive
Posted: Mon Jun 27, 2022 12:25 pm
by Pr0f
I think the link just moves the Current Microdrive train 'closer' to the Zx8302
So if you bridge the link in the header for MDV1 - MDV2 will actually become MDV1 - if you bridge MDV2 as well - then MDV1 will be the first external drive. The select signal just gets clocked through available devices.
Re: Microdrives not working and now neither oqtadrive
Posted: Thu Jun 30, 2022 5:09 am
by bola_dor
Whithout the links MDSELDN won't reach the edge connector. At first I used a long wire from mdv1 IN to mdv2 OUT. The I realized that this way, mdv1 led indicator was skipped...