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Forums > CSDb Discussions > Error message: "Found more than one drive on IEC bus" with C128D metal and recent demos
2017-11-08 11:26
Monte Carlos

Registered: Jun 2004
Posts: 249
Error message: "Found more than one drive on IEC bus" with C128D metal and recent demos

Sorry for this lamer question. I use an C128D(metal), currently (although i have used C64 for years until i got room problems with the complete setup).
I have attached a 1541 ultimate and changed the internal 1571 drive to device no 10 by cutting the solder pads. The ultimate has dev no 8. This way i can watch many, mostly old, demos with 1541U. However, the most current demos always complain about more than one drive being enabled. Ok, i thought, plugging off the internal 1571 from the mainbord should fix the problem. I was wrong. The loaders still complain about more than one drive.
Am i wrong with my understanding that plugging off the internal drive also disables the ATN signal?
2017-11-08 20:58
Krill

Registered: Apr 2002
Posts: 902
Unplugging a drive from the bus would of course remove all its signaling lines, including ATN. Drive presence detection is usually done by addressing them directly, and seeing if they respond, which involves all 3 lines, not just toggling ATN and seeing what happens.

Are you sure that all devices (including printers :D) on the bus, except for #8, are removed? And that the 1541U isn't multiplexing drives or so? :)
2017-11-08 21:24
Monte Carlos

Registered: Jun 2004
Posts: 249
I have the 1541U configured so that one 1541 on 8 is active, only. The drive to access USB stick directly is turned off, too.
Thank you for the hint with the printer. I'll check if virtual printer is off, too. No real printer, though.
2017-11-08 22:40
Monte Carlos

Registered: Jun 2004
Posts: 249
Software ICE drives and printers are off.
2017-11-09 10:44
Skate

Registered: Jul 2003
Posts: 469
Is it possible somehow you're running the PRG without mounting the disk? I remember having issues with directly selecting PRG file inside the D64 without mounting the D64 itself. This could be the problem but i'm not infront of my C64 at the moment, i'm only guessing.

You can try mounting D64 first, then running the disk with LOAD command to make sure.
2017-11-09 10:52
Krill

Registered: Apr 2002
Posts: 902
This will print 0 for present devices and something else otherwise:
FORN=8TO30:OPEN1,N,2:CLOSE1:PRINTN;ST:NEXT
What does it say on your mystery system? :)
2017-11-09 12:22
Flavioweb

Registered: Nov 2011
Posts: 344
The drive logic in a 128d is on board, or is "near" the mechanics?
May be that "unplug" the drive mean just unplug the mechanics but logic still active...
No?
2017-11-09 14:17
Krill

Registered: Apr 2002
Posts: 902
The C128D has discrete PCBs for main computer and drive, so the drive part should be completely unpluggable.
The C128DCR has both PCBs merged into one, but what this means for the disconnectibility of the drive portion, i can't say.
2017-11-09 15:22
Krill

Registered: Apr 2002
Posts: 902
Looking at the C128DCR (which is the metal C128D) schematics, it very much seems like there is no way of disconnecting the drive electronics from the serial bus, save cutting their traces.

Uploading a small program to the built-in drive that would disable interrupts and set ATNA according to ATN IN in a loop would probably solve your problem, but alas, i have no time right now to hack it up.
2017-11-09 16:24
Monte Carlos

Registered: Jun 2004
Posts: 249
If its not possible to plug of the drive, there should still be the possibility to cut the ATN line and insert a switch instead? After googling i found an howto on herdware, however there is some pic missing.
http://commodore128.mirkosoft.sk/herdware.html
Somebody knows what they mean with "threethrough-hole solder pads"?
2017-11-09 16:32
Krill

Registered: Apr 2002
Posts: 902
Would you really want to cut traces if there's a viable software solution? Poor C128.
 
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