GVP '030/ram/scsi accelerator problem?

[sprocket]

I'm uncertain how much of a problem I have but...

I have a GVP '030/ram/scsi card I got with some other items.  It was not installed and wasn't claimed to be working so I have no idea of its state.

At the moment it fails to function in a 2000 with the machine failing to boot with it in.  It doesn't cycle and keep trying to reboot, it just won't do anything.  On removal the 2000 boots fine.

I've looked at the jumpers per configs I've found, I've tried the board with and without a scsi drive attached.

Any ideas on troubleshooting this?

It may have a fault and require someone with more training to diagnose and fix if possible.  is there anyone around who looks at GVP stuff in the U.S. any more?

thanks.

[keropi]

mine died slowly the same way.... first it would not boot with ram enabled, and then no  boot at all... a2000 works OK now with an A2630... I had the 40mhz combo version, rev 4.03 ...

[sprocket]

maybe it's as simple as bad ram?

I think I'll try removing the sole simm installed and checking the jumpers again and see if it will work....

otherwise, I'm thinking scsi might be misconfiged somehow...or if there's some autoboot thing.

[rkauer]

 Probably a cold junction on the crystal killed the 030. Notice that any 68k CPU will die if it not receive a proper clock.

[countzero]

do you have another scsi+ram addon on that A2000 ? it might be a zorro2 space conflict. you can move GVP's ram into 030 extended space with jumpers.

[Argus]

A black screen means a cpu problem; so it's entirely possible you're suffering from the dreaded cold solder problem.  It could be just about anywhere; but a quick examination of the cpu socket and crystal oscillator may help.  It could also be one of the ttl chips or a pal somewhere on the board.  You could also try reseating the cpu chip and the small square custom logic chip on the accelerator board (it should be an AMD chip); you'll need a small jewelers tool and a PLCC chip extraction tool (Radio Shack has them).  If all else fails, JJ Boulet at Amiga Center fixed an old 68040 GVP Combo for me.  It had bad solder joints under the 68040, he replaced the PLCC chip holder for that big custom chip (mine was cracked/warped) and he also replaced a couple small buffer chips for me...works now.

[sprocket]

do you have another scsi+ram addon on that A2000 ?

nothing in the machine other then the GVP board.  I've tried it with the scsi connected and disconneted.  only extra ram is on the GVP.

[sprocket]

A black screen means a cpu problem; so it's entirely possible you're suffering from the dreaded cold solder problem. It could be just about anywhere; but a quick examination of the cpu socket and crystal oscillator may help. It could also be one of the ttl chips or a pal somewhere on the board.

entirely possible.

I'll keep playing with it.  reseating was on my list.  no cracks or anything broken that I can see.

there is a dark area on the metal plate behind the card.  My assumption was that normal component heat had done it but it may have been something worse.

[rkauer]

 Pictures?

[da9000]

rkauer wrote:
 Probably a cold junction on the crystal killed the 030. Notice that any 68k CPU will die if it not receive a proper clock.

Is this common or  documented someplace Rkauer? My experience with 68ks (mostly 68040s when it comes to playing with crystals) doesn't match up to them dying with improper clocks.

[sprocket]

the dark area was on the plate the hard drive was mounted to...likely from the drive.

nothing else 'looks' bad.

[banzai]

What Rev A2000 do you have? Some required that you pull the 68000 from the socket before installing any accelerators.

Ahh! From page 3 of my Combo 030 manual:

"Note: The 030-Combo board does not work in the very early A2000 models which have the old 4-layer motherboard made by Commodore in Braunschweig, Germany. These machines were mainly sold in Europe and were never officially sold by Commodore in the USA. GVP does offer other 68030 accelerator products which do work in these older A2000 machines."

RAM:

All mapped to 32-bit -> J10 & J13 shorted
Mixed mode autoconfig/32 -> J10 open, J13 shorted
4MB auto, rest as 32 -> J10 $ J13 Open

Jumpers: (*=default)
J3 -> Short=Disable MMU, *Open=MMU enabled
J4 -> *Short=No SCSI, Open=Autoboot SCSI
J6 -> Short=68K, *Open=030
(^ You can also hold down the left mouse button to re-boot into 68K mode using the boot68000 utility)
J9 -> *Short=EPROM enabled, Open=disabled

--RESERVED JUMPERS--
J7 *Short
J8 *Open
J11 *Open
J12 *Short
J14 (*Open on 22MHzCombo) (*Short on 33MHz)
J15 *Short
J16 (*Open on 22MHzCombo) (*Short on 33MHz)
J17 *Short
J18 *Short
J19 *Short
J20 (*Open on 22MHzCombo) (*Short on 33MHz)
J21 *Short pins 1-2 (bottom two)
J22 *Short
CN6 -> SCSI ACT LED
CN7 *Short pins 1-2
CN8 (*Short pins 1-2 on 22MHzCombo) (*Open on 33MHz)

GVP sold three versions of the Combo - the 22MHz, 33MHz, and the 50MHz. My manual covers the 22 and 33 (noted above), but no jumpers for the 50 are given. Sorry.

banzai

[sprocket]

What Rev A2000 do you have? Some required that you pull the 68000 from the socket before installing any accelerators.

nope..this is a revision 6.x motherboard...and does work with another GVP accelerator I have.

this is a 50 Mhz '030.

thanks.

[rkauer]

da9000 wrote:

rkauer wrote:
 Probably a cold junction on the crystal killed the 030. Notice that any 68k CPU will die if it not receive a proper clock.

Is this common or  documented someplace Rkauer? My experience with 68ks (mostly 68040s when it comes to playing with crystals) doesn't match up to them dying with improper clocks.

 Correcting: the CPU will die if it not receive a clock signal.