Re: Strange Problem Amiga 2000

On 10/06/2018 07:33 PM, Mia Magnusson wrote:
> Den Sat, 6 Oct 2018 19:20:38 +0200 skrev Gerrit Heitsch
> <gerrit@laosinh.s.bawue.de>:
>> On 10/06/2018 06:38 PM, Rainer Buchty wrote:
>>> On Sat, 6 Oct 2018, Gerrit Heitsch wrote:
>>>
>>>> Anyone having an idea what might be the cause? The GOTEK delivers
>>>> the data faster (meaning less latency, datarate is, of course, the
>>>> same as with a floppy drive).
>>>
>>> There's at least one machine, the PPG Waveterm, that requires a
>>> pulse stretcher to "digest" the GOTEK read-data output. If that's
>>> also the underlying issue here, you might want to attach a monoflop
>>> there to make the 1-pulses a tad longer.
>>
>> Well, once I get over the initial possibility of a crash, everything
>> loads and writes fine. And with a KS 1.2 ROM I don't have any
>> problems at all. That kind of indicates that the data delivered by
>> the GOTEK is no problem for PAULA to digest and decode.
> 
> I might had missed something, but did this problem appear when you
> installed the GOTEK and was it known to work before you installed the
> GOTEK?

As I wrote... The GOTEK only makes it more likely to happen, but it also 
happens with a normal floppy drive and disk.


> Are this revision of Amiga 2000 really known to generally "work"? (Of
> course they did work as they were delivered back then, but are various
> expansion cards and upgrades known to be compatible)?

Well, this version is using an early version of the Zorro bus, the whole 
logic implemented in PALs and TTLs and not a BUSTER chip as in the later 
A2000 where AGNUS came in 84pin PLCC instead of 48pin DIP. There are 
some problems with the bus protocol on the Zorro slots.

The main difference is that if you use a CPU card with this A2000, you 
have to remove the 68000 from the mainboard.

But then, I am not using a CPU card or any kind of expansion card in it 
and I either have to use the right CPU (the ST 68000) when using KS 1.3 
or just use KS 1.2 with any 68000 to have no problems at all.

  Gerrit