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Author Topic: A1200 motherboard fix  (Read 3733 times)

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Offline MilooTopic starter

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A1200 motherboard fix
« on: December 09, 2008, 11:42:03 AM »
Looking at :
 http://www.ianstedman.co.uk/Amiga/amiga_hacks/A1200_Mobo_fix/A1200-timingfix.jpg

It says to remove 123C and 125C but on the picture 123R and 125C are circled - which is right?
A1200/68882/AMD Slot A 1Ghz in EZPC case, Blizzard 060@66Mhz/SCSI IV, PortJnr, 194Mb fast ram, 4Gb CF HD, OS 3.9, Indivision AGA
 

Offline RedskullDC

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Re: A1200 motherboard fix
« Reply #1 on: December 09, 2008, 11:49:17 AM »
Remove the caps only. 123C, 125C

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Offline Tension

Re: A1200 motherboard fix
« Reply #2 on: December 09, 2008, 01:34:52 PM »
BEWARE!!! I TRIES FIXING MY A1200 MOBO WITH THIS BLOODY TIMING FIX, AND THE BOARD NEVER WORKED AGAIN!!!

Offline MilooTopic starter

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Re: A1200 motherboard fix
« Reply #3 on: December 09, 2008, 01:35:12 PM »
Damn I desoldered what was circled :-o
A1200/68882/AMD Slot A 1Ghz in EZPC case, Blizzard 060@66Mhz/SCSI IV, PortJnr, 194Mb fast ram, 4Gb CF HD, OS 3.9, Indivision AGA
 

Offline klx300r

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Re: A1200 motherboard fix
« Reply #4 on: December 09, 2008, 02:36:12 PM »
never understood what exactly this mod supposedly fixes :-?
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Offline jj

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Re: A1200 motherboard fix
« Reply #5 on: December 09, 2008, 04:57:14 PM »
It fixes timing isusses which cause locks and software failures on some accelerator boards.

This is usally with the faster Apollo cards as they are not buffered.

Where as never had trouble with blizzard cards cause they are buffered but subsequently run slower
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Offline BuzzBrain

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Re: A1200 motherboard fix
« Reply #6 on: December 09, 2008, 06:51:55 PM »
Hi


My A1200 (rev. 1d4) had lookups and other problems when I used a Apollo 1260 card.

Then I did the mobo fix.

Now my a1200 works like a dream :)

I'm happy with this mod.
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Offline orange

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Re: A1200 motherboard fix
« Reply #7 on: December 09, 2008, 07:18:47 PM »
I also used some of those hacks, and they fixed problems with Mtec 030 accel.
(the A1200 used to freeze with no reason before with 030)
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Offline MilooTopic starter

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Re: A1200 motherboard fix
« Reply #8 on: December 09, 2008, 07:30:19 PM »
Whats the cap that I've got to resolder, I cant find the one I desoldered :boohoo:
A1200/68882/AMD Slot A 1Ghz in EZPC case, Blizzard 060@66Mhz/SCSI IV, PortJnr, 194Mb fast ram, 4Gb CF HD, OS 3.9, Indivision AGA
 

Offline klx300r

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Re: A1200 motherboard fix
« Reply #9 on: December 09, 2008, 07:54:05 PM »
ahh ok thanks :-)  never had a lock up with my Blizzard 030 with my Rev1D4 board but good to know ;-)
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Offline AmigaMance

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Re: A1200 motherboard fix
« Reply #10 on: December 09, 2008, 08:39:24 PM »
Quote

JJ wrote:
It fixes timing isusses which cause locks and software failures on some accelerator boards.

This is usally with the faster Apollo cards as they are not buffered.

Where as never had trouble with blizzard cards cause they are buffered but subsequently run slower


 What i have read in various threads, is that the Appolo cards are indeed more prone to this problem, but every card with a 68040/68060 CPU can be affected by this.
 "Unfixed" motherboards can also cause problems with fast IDE interfaces.
A1200 PPC user.
 

Offline StevenJGore

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Re: A1200 motherboard fix
« Reply #11 on: December 09, 2008, 09:22:30 PM »
It's easier to use cardpatch and cardreset which can be found on Aminet. Much easier than hacking motherboards.

Steve.
 

Offline AmigaMance

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Re: A1200 motherboard fix
« Reply #12 on: December 09, 2008, 10:01:35 PM »
@StevenJGore
 I think you are off topic.
A1200 PPC user.
 

Offline clint

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Re: A1200 motherboard fix
« Reply #13 on: December 09, 2008, 10:19:41 PM »
@AmigaMance

StevenJGore is right, they do the same fix.

clint
 

Offline Damion

Re: A1200 motherboard fix
« Reply #14 on: December 09, 2008, 10:25:07 PM »
PCMCIA fix involves soldering a cap near Gayle (which is a different fix).