| Posted By
manxmann
on 2019-08-26
14:11:38
|  Disk load fails
Hi Folks,
Question for those in the know. I have two (don't ask) apparently working +4's, I say apparently as both pass all tests from the DIAG264 cartridge and run the on-board 3 in 1 software.
Now the problem, I have a Pi1541 that I use with all my CBM machines , Vic/64/16/128 and 1 of the +4's and this solution works brilliantly. However on the other plus 4 I can load 'small' programs, such as FB16 and ieverything works perfectly however attempting to load anything larger, say Elite +4 and the load starts and never completes. No errors the +4 just sits there.
Hooking the Pi up to a monitor and I can see activity when the program starts to load then the data line falls silent.
I'm suspecting a partial CPU failure, the troublesome unit sports an early 7501 cpu and the working one the later 8501.
I've re-capped both machines and the CPU and TED are fitted with large heatsinks.
Cheers
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Posted By
crock
on 2019-08-26
16:08:36
 | Re: Disk load fails
Hi Manxmann, What version of Diag264 are you using, and do you use all the loopback plugs with it?
Rob
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Posted By
manxmann
on 2019-08-27
15:24:12
| Re: Disk load fails
Hey Rob,
Thanks for the reply. Looking at the back of the cart it says v0.94 PAL on the screen its says .94 BETA / build 201902241940 this particular cart doesn't seem to use the loopback harness.
I should really swap over the CPU's and see if the problem follows but I've been avoiding it as the heatsinks make extracting the chips somewhat awkward.
Simon
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Posted By
manxmann
on 2019-08-27
15:28:46
| Re: Disk load fails
Sorry I told a great big fib, this cart DOES test the ports, it flashes past a little quickly after the joystick test and I mustn't have been paying attention. 
I don't have / haven't made a hardness.
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