M-tec T1230/28 RTC

[Mauro73]

Hi,

I've bought a PLCC coprocessor for this card and I was wandering if it needs a crystal/oscillator too.

The guy who sold me the coprocessor is the same who made the accelerator board (so he says) and he told me that there were no need of a crystal/oscillator.

But I see the pictures of this board no the hardware database and I can clearly see the oscillator mounted together with the math coprocessor.

I'm a bit confused :-?

I've tried to instal the 68882 plcc without the oscillator (I don't own any) but the A1200 crashes.

May be I've to try some jumper setting or may be the hard drive is not compatible... who knows?

Thank you in advance for your advices

Mauro

[countzero]

you don't need the oscillator unless you want to run them at different frequencies.

[Mauro73]

countzero wrote:
you don't need the oscillator unless you want to run them at different frequencies.

Ok, then I've to understand why the A1200 crashes as soon as I power it on :-(

Mauro

[countzero]

maybe there is a jumper which enables oscillator for FPU. you may need to set it off.

[Mauro73]

countzero wrote:
maybe there is a jumper which enables oscillator for FPU. you may need to set it off.

The jumpers on the board are divided into two groups. Here they are with my settings:

------------
first group
------------
Turbo (open)
MEM3  (open)
CACHE (open)
MEM2  (closed)
MEM1  (closed)
MEM0  (closed)

------------
second group
------------
Async (open)
28MHz (closed)
14MHz (open)
RTC   (closed)

[rkauer]

 Reading the manual (thanks God, my german is not dead, already), I found your settings correct.

 So my suspicions are pointing to a dead FPU.

 BTW: if you have a full 030 (non-EC), close the "turbo" jumper, it enables data and instruction caches on the CPU!