A1200 timing problems

[Matt_H]

My 1200T is driving me mad

Where do I even begin?
First, the machine can't seem to autoconfig when I have a PowerFlyer ZIV installed. It hangs during initialization; I can't even get to Early Startup Control.
Next, my Delfina Lite isn't recognized in my new ZIV bus. It worked in the Micronik bus.

Everything works without the accelerator, which leads me to suspect timing problems. I bought the system second hand before I towered it up, and there was already some work done on the motherboard. This was in 1997, and I can't recall if the concept of the timing fix existed then? I don't know what a properly fixed board looks like, so I'm not sure what the work is. If it is the timing fix, well, then my problems seem a little more serious. Can anyone offer some insight or detailed info on what the timing fix is supposed to look like on the board? My internet searches haven't been successful.

I've tested every jumper combination on the ZIV bus. Nothing seems to work.

System Specs:
A1200 1d4 w/ 3.1 ROMs
Blizzard 1260 w/ SCSI-IV (48Mb RAM installed)
Picasso II (Rev 1.4 - OLD)
Delfina Lite
X-Surf
PowerFlyer ZIV
OS 3.9.2

Thanks in advance

[lorddef]

It depends on which version of Budgie you have on the mobo. If you have a revision 1 budgie then two SMT capacitors (namely e123c and e125c) will have been removed from the underside of the mobo (underneath Alice).  If you have a version 2 budgie I think you should have one of the SMT resistors moved about in addition to this.

[Yogi27]

Hi Matt_H.

   I don't have any advice about your A1200T, but
I noticed that you said your A1200 mobo had some
modifications made to it.  Well, I have a A1200
motherboard (Commodore Rev 2B) sitting around
here.  It works, it just needs rom chips. I
took them out to put in my Amiga Technologies
A1200.  You can have it for the cost of shipping
it to you.  It has had no modifications done
to it, and maybe getting an original motherboard
might help.  You can contact me at yogi_amiga@yahoo.com.
I live in Chicago, so shipping should be nothing
if you want it.

Yogi27

[Matt_H]

@ lorddef

The Budgie chip says:
REV 0
391425-01
I think that's a Rev 1. I'll check the capacitors this afternoon. Thanks.

@Yogi27
That's very generous of you. I could use a spare board. I think I'll take you up on that offer. I'll send an email later today.

Eyetech has some information on this. Go to
http://www.eyetech.co.uk/

Click "SEARCH" in the menu and enter:
A1200 motherboard

Now click the "i" icon on the right. This will show you 3 links with information:

"Motherboard revision levels"
"Do you need the revision 2B or 1D4 motherboard fix" and finally
"Fully fixed new Amiga Motherboards in stock"

I hope this helps!
John.

[Matt_H]

[lorddef]

Yeah, thats rev 01