A1200 motherboard fix

[Miloo]

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?

[RedskullDC]

Remove the caps only. 123C, 125C

Red

[Tension]

BEWARE!!! I TRIES FIXING MY A1200 MOBO WITH THIS BLOODY TIMING FIX, AND THE BOARD NEVER WORKED AGAIN!!!

[Miloo]

Damn I desoldered what was circled :-o

[klx300r]

never understood what exactly this mod supposedly fixes :-?

[jj]

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

[BuzzBrain]

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.

[orange]

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)

[Miloo]

Whats the cap that I've got to resolder, I cant find the one I desoldered :boohoo:

[klx300r]

ahh ok thanks :-)  never had a lock up with my Blizzard 030 with my Rev1D4 board but good to know ;-)

[AmigaMance]

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.

[StevenJGore]

It's easier to use cardpatch and cardreset which can be found on Aminet. Much easier than hacking motherboards.

Steve.

[AmigaMance]

@StevenJGore
 I think you are off topic.

[clint]

@AmigaMance

StevenJGore is right, they do the same fix.

clint

[Damion]

PCMCIA fix involves soldering a cap near Gayle (which is a different fix).