Problems getting my A1200 & a 12Guage 030 accelerator working with the 3.1 ROMs

[Zordar]

Hi,

I had a question regarding a problem I've been having with my old Amiga 1200 system & was hoping I could find someone
who might have a suggestion, or could at least point me in the right direction.

I finally took my Amiga A1200 out of mothballs, it's been sitting idle since 1997 & I was feeling a bit nostalgic.
The system includes a stock A1200 with a 12Gauge 030/882 50MHz accelerator with an 8MB memory SIMM, a 40MB hard
drive & 3.0 ROMs.  I hooked up everything, turned the system on & it booted just as it did 12 years ago.  I
figured, why not take the opportunity & give the system a bit of a face lift, so I got my hands on a pair of 3.1
ROMs, slapped them in, turned the system on, and.......nothing, no post, no drive clicking, no booting,
NOTHING! just a black screen.

I replaced the 3.1 ROMs with the original 3.0 ROMs, and the system booted up fine once again.  To make a long story
short, I traced the problem to the 12Guage itself, or more specifically, to the memory.  I found that the system will
boot up just fine with both the 3.1 ROMs & the 12Guage installed, but only if the memory SIMM is removed from the
accelerator!

I was wondering if anyone has/had a similar experience with the 12Guage.  I know the 12Guage was one of the very first
CPU accelerators available for the A1200 & was made well before 3.1 came out.  I tried researching this problem
on-line, but couldn't really find any information about the 12Guage itself, let alone this specific issue.  I'd
appreciate any suggestions or insight anyone might have regarding this problem, thanks.

John.

[Zordar]

Hi da9000,

Thanks, it's good to be back, I've been drowned in PC/MS garbage for far too long!  

I took your advice I looked through the forums for information regarding the A1200/12Guage issues, but
couldn't find anything.

Zordar.

[Zordar]

Hi Argus,

The 12Guage does have an old style socketed EPROM on-board, this EPROM has a sticker with the Writing: 22162A R1.0 0874.
I bet that the best chance of getting this card working with 3.1 is finding an updated version.  The problem is, I
don't even know if an updated version was ever made available, let alone finding a source that has/sells it.

Any idea what the writing on the EPROM means - I'm assuming "R1.0" is the version, and if a newer version was ever made
available?  Would it be possible to dump the contents of the EPROM & adjust it to play nice with 3.1 ? Thanks.

Zordar.

Argus wrote:
Yes, he's right, the 12-Gauge came out when 3.0 was all the rage.  They changed something in the 3.1 roms which made adding fast memory different so a bunch of the 1200 accelerators needed firmware updates or extra startup-sequence commands to add the fast memory.  This is a pretty well known problem with the 12-Gauge, though I never owned one myself.  They seem a bit rare.