Problem with crashing on 16mb SIMM on GVP 1230/40 accelerator

Boom^ · 04 January 2014, 21:28

Hi, I have an Amiga 1200 (CBM vers with 3.0 ROMS) with a GVP 1230 accelerator on it. Like the image shown here except mine is a 40mhz 030 on it.

The accelerator card originally came with 2x 1mb simms on it. But I wanted to upgrade to more RAM. So I put in a 16mb GVP 64pin SIMM from a reputable dealer.

I have configured the card jumpers as shown in the above picture. Basically only J5 and CN5 on.

The problem is, when i switch on, the Amiga starts to boot, gets as far as the first flash of the HD light (got a compact flash card) and then the power light starts flashing and it either gets stuck in a reboot loop or freezes altogether.

I've tried alsorts of configurations, RAM in different slot, different jumper settings etc and just cant get it to work. If I remove CN5 then the Amiga boots fine, but only registers 8MB of the 16MB on the card. Now although it seems fine, ie I can fill the ram disk up without crashing. If I run a WHDLoad game that is AGA, WHDLoad will guru meditate. (Before it would say it couldn't allocate enough memory when i only had 2mb fast ram)

So I'm a bit stuck now why its crashing. I cant get to the early boot menu, it seems to crash just before thats due to appear. I've tried removing everything including the IDE flash card, but it still wont get to a bootable stage. It gets damned close tho!

As anyone seen this sort of behaviour from these GVP Accelerators before?

Kin Hell · 05 January 2014, 14:10

As a bit of a hardware Engineer, I'd be inclined to think the 16Mb GVP SIMM is at fault. The manual does say put the bigger of two SIMM's (when using both slots) in the first slot. - Try reverse Engineering & put one of your 1Mb SIMM's in Slot 1 & the 16Mb one in slot 2. - Do check jumpers too before powering up.

What happens now?

Boom^ · 05 January 2014, 17:21

Hi,

Thanks for your response. I have double checked jumpers, they are configured as per the picture above.

If i swap them round, ie 1mb simm in slot 1, and 16mb simm in slot 2, it gets a bit further. Ie i can get the early boot menu up. It shows teh expansion board as working and i can see my HD partitions.

However if i boot it up (even with no startup-sequence) it loads for a bit then freezes, and i have to reboot. This is before any amigados screen comes up.

Kin Hell · 06 January 2014, 06:05

Sounding like a duff SIMM fella. Trying another SIMM is going to be your only other option I guess. Perhaps another Jaws II user might offer to try the SIMM for you.

Boom^ · 12 March 2014, 18:22

Sorry to bump an old thread. I just wanted to conclude it by saying everyone was correct. The SIMM was duff. I returned it to the reseller and got a full refund on it. My hunt for a working SIMM will go on

Thanks all for your suggestions!

04 January 2014, 21:28	#1
Boom^ Registered User Join Date: Sep 2009 Location: Estepona, Spain Posts: 38	Problem with crashing on 16mb SIMM on GVP 1230/40 accelerator Hi, I have an Amiga 1200 (CBM vers with 3.0 ROMS) with a GVP 1230 accelerator on it. Like the image shown here except mine is a 40mhz 030 on it. The accelerator card originally came with 2x 1mb simms on it. But I wanted to upgrade to more RAM. So I put in a 16mb GVP 64pin SIMM from a reputable dealer. I have configured the card jumpers as shown in the above picture. Basically only J5 and CN5 on. The problem is, when i switch on, the Amiga starts to boot, gets as far as the first flash of the HD light (got a compact flash card) and then the power light starts flashing and it either gets stuck in a reboot loop or freezes altogether. I've tried alsorts of configurations, RAM in different slot, different jumper settings etc and just cant get it to work. If I remove CN5 then the Amiga boots fine, but only registers 8MB of the 16MB on the card. Now although it seems fine, ie I can fill the ram disk up without crashing. If I run a WHDLoad game that is AGA, WHDLoad will guru meditate. (Before it would say it couldn't allocate enough memory when i only had 2mb fast ram) So I'm a bit stuck now why its crashing. I cant get to the early boot menu, it seems to crash just before thats due to appear. I've tried removing everything including the IDE flash card, but it still wont get to a bootable stage. It gets damned close tho! As anyone seen this sort of behaviour from these GVP Accelerators before?

05 January 2014, 14:10	#2
Kin Hell 0ld0r Git Join Date: Mar 2009 Location: Cornwall, UK Posts: 1,570	As a bit of a hardware Engineer, I'd be inclined to think the 16Mb GVP SIMM is at fault. The manual does say put the bigger of two SIMM's (when using both slots) in the first slot. - Try reverse Engineering & put one of your 1Mb SIMM's in Slot 1 & the 16Mb one in slot 2. - Do check jumpers too before powering up. What happens now? Last edited by Kin Hell; 06 January 2014 at 06:00.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
GVP 1230 Turbo+ Jaws Problem	broddr	support.Hardware	5	30 October 2013 09:48
Want to Dismantle :) GVP 64Pin 4MB or 16MB SIMM	Zetr0	MarketPlace	8	04 September 2008 14:08
Added SIMM to ZIP adapter, now 16MB Fast RAM	tonyyeb	support.Hardware	18	01 September 2008 10:59
WTD: Want to Dismantle - GVP 64Pin 4MB or 16MB SIMM	Zetr0	MarketPlace	11	08 July 2008 18:53
Kickrom 3.1 and GVP 1230+ problem	winloze99	support.Hardware	4	30 December 2005 20:06

05 January 2014, 17:21	#3
Boom^ Registered User Join Date: Sep 2009 Location: Estepona, Spain Posts: 38	Hi, Thanks for your response. I have double checked jumpers, they are configured as per the picture above. If i swap them round, ie 1mb simm in slot 1, and 16mb simm in slot 2, it gets a bit further. Ie i can get the early boot menu up. It shows teh expansion board as working and i can see my HD partitions. However if i boot it up (even with no startup-sequence) it loads for a bit then freezes, and i have to reboot. This is before any amigados screen comes up.

06 January 2014, 06:05	#4
Kin Hell 0ld0r Git Join Date: Mar 2009 Location: Cornwall, UK Posts: 1,570	Sounding like a duff SIMM fella. Trying another SIMM is going to be your only other option I guess. Perhaps another Jaws II user might offer to try the SIMM for you.

12 March 2014, 18:22	#5
Boom^ Registered User Join Date: Sep 2009 Location: Estepona, Spain Posts: 38	Sorry to bump an old thread. I just wanted to conclude it by saying everyone was correct. The SIMM was duff. I returned it to the reseller and got a full refund on it. My hunt for a working SIMM will go on Thanks all for your suggestions!

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)