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Monte Carlos
Registered: Jun 2004
Posts: 358 |
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? |
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Krill
Registered: Apr 2002
Posts: 2969 |
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? :) |
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Flavioweb
Registered: Nov 2011
Posts: 463 |
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? |
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Krill
Registered: Apr 2002
Posts: 2969 |
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. |
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Krill
Registered: Apr 2002
Posts: 2969 |
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. |
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Monte Carlos
Registered: Jun 2004
Posts: 358 |
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"? |
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Krill
Registered: Apr 2002
Posts: 2969 |
Would you really want to cut traces if there's a viable software solution? Poor C128. |
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Krill
Registered: Apr 2002
Posts: 2969 |
Also, does the little BASIC line above report a drive on #10, as is expected? |
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Monte Carlos
Registered: Jun 2004
Posts: 358 |
Can't try it at the moment with my two year boy next to me. Will try in the evening. |
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Monte Carlos
Registered: Jun 2004
Posts: 358 |
Yes, it shows drive on ID 10.I ridiculously just unplugged the mechanics.btw:hw hack would not be the worst solution for me if it permitted a durable, unproblematic operation of 1541u with my 128dcr. |
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Krill
Registered: Apr 2002
Posts: 2969 |
If running a small "shut up everybody who's not #8" program before watching that demo is too much, wellÂ… yeah. :) |
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