On Mon, Dec 14, 2015 at 6:32 PM, dwight wrote:
> Do remember when ordering 2114's that these are all NOS units
> and just about as likely to be bad as the ones in your unit.
Too true. NOS doesn't mean it's working.
> I don't know of any surplus place that has the ability to test them.
Or the i
If you need 6522 chip(s) please contact me off-list - I have more than I
need, would be happy to pass one along to a needy drive..
On Mon, Dec 14, 2015 at 5:32 PM, dwight wrote:
>
> Do remember when ordering 2114's that these are all NOS units
> and just about as likely to be bad as the ones in
Do remember when ordering 2114's that these are all NOS units
and just about as likely to be bad as the ones in your unit.
I don't know of any surplus place that has the ability to test them.
Most any of the places that I've dealt with will replace bad ones
but if dealing by mail order, it may not
They can be easily replaced with newer chips. But any work with it should
make you think about building a sd2iec hehehehe
(I gotta build one for me...)
Enviado do meu Tele-Movel
Em 14/12/2015 16:09, "tony duell" escreveu:
> >
> > I don't think any of the single-disk CBM drives used 2114s (but I
>
> I don't think any of the single-disk CBM drives used 2114s (but I
> agree - those are favorite suspects when present). I'm pretty sure
> all the units I've worked on have 6116-type 2K SRAMs or perhaps 6264s.
> I'd have to go back and check parts lists, but the older dual-drive
> units might h
On Sun, Dec 13, 2015 at 10:22 AM, tony duell wrote:
>>
>> I've done the obvious, reseating socketed ICs, checking the +12V and +5
>> rails, and checking the on-board CPU reset line. Does anyone have any tips
>> for what's best to try next?
>
> Didn't at least some versions use 2114 RAM chips? If s
On 12/13/2015 12:42 PM, Alexandre Souza wrote:
Had lots of 6522 and ROM failures here. I'd begin with rom replacement
Yeah, I did some swapping around. It seems that one faulty drive has ROM
problems, and the other has both a ROM fault *and* a dead 6522 in UC2.
cheers
Jules
Had lots of 6522 and ROM failures here. I'd begin with rom replacement
Enviado do meu Tele-Movel
Em 13/12/2015 16:34, "tony duell" escreveu:
> >
> > Yes, I've certainly seen that on the schematics, and was considering them
> > as a likely failure too - after opening cases though, my drives all s
>
> Yes, I've certainly seen that on the schematics, and was considering them
> as a likely failure too - after opening cases though, my drives all seem to
> have a single larger SRAM (even the Rev A board, so that's presumably "Rev
> A of the type that doesn't use 2114's" :-)
Yes, later versions
On 12/13/2015 09:22 AM, tony duell wrote:
I've done the obvious, reseating socketed ICs, checking the +12V and +5
rails, and checking the on-board CPU reset line. Does anyone have any tips
for what's best to try next?
Didn't at least some versions use 2114 RAM chips? If so, then check/change
t
On 12/13/2015 7:22 AM, tony duell wrote:
I've done the obvious, reseating socketed ICs, checking the +12V and +5
rails, and checking the on-board CPU reset line. Does anyone have any tips
for what's best to try next?
Didn't at least some versions use 2114 RAM chips? If so, then check/change
th
On 12/12/2015 08:27 PM, Mike van Bokhoven wrote:
Locked on LEDs and spindle motor would suggest VIA to me, though it's been
many years since I've looked at one. First thing I'd check is that there's
activity on the address/data buses.
I don't have a lot of test gear, but I suppose poking at A0
>
> I've done the obvious, reseating socketed ICs, checking the +12V and +5
> rails, and checking the on-board CPU reset line. Does anyone have any tips
> for what's best to try next?
Didn't at least some versions use 2114 RAM chips? If so, then check/change
those first
-tony
On 13/12/2015 2:01 p.m., Jules Richardson wrote:
I have four 1541's now, two of which seem to init OK, and two of which
sit there with the drive spindle constantly spinning and the access
LEDs lit, the latter behavior which I believe indicates a multitude of
possible microcontroller-related fau
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