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Amiga computer related discussion => Amiga Hardware Issues and discussion => Topic started by: fragment on October 27, 2003, 05:01:59 PM

Title: A1200 hardware patches
Post by: fragment on October 27, 2003, 05:01:59 PM

There are some mysterious patches on my A1200 rev 2B motherboard. Can anyone identify these?

1. on the CIA chip (http://fragment.stc.cx/amigapatches/cia.jpg)
2. from clockport to paula (http://fragment.stc.cx/amigapatches/clock-paula.jpg)
3. and one resistor near the roms (http://fragment.stc.cx/amigapatches/next_to_roms.jpg)

I haven't had any problems with the machine, just curious  :-)

Title: Re: A1200 hardware patches
Post by: Ryu on October 27, 2003, 05:12:25 PM

cool, ive never seen such patches on any of the 2B mobo's Ive ever had :-) I have couple of patches on this 1D1 though....

Title: Re: A1200 hardware patches
Post by: bloodline on October 27, 2003, 05:15:35 PM

Quote

Ryu wrote:
cool, ive never seen such patches on any of the 2B mobo's Ive ever had :-) I have couple of patches on this 1D1 though....

The easiest way to see what they do, is to cut them and see what stops working!! :-D

Title: Re: A1200 hardware patches
Post by: Ryu on October 27, 2003, 07:35:25 PM

lol, im not quite mad enough to do that :-)

Title: Re: A1200 hardware patches
Post by: Madgun68 on October 27, 2003, 08:18:10 PM

I'll take a peek at some schematics here later and see if they do anything useful. The only thing I can say off hand is that it doesn't appear that the person who did these didn't have terribly good soldering skills.

Title: Re: A1200 hardware patches
Post by: Matt_H on October 27, 2003, 08:22:25 PM

Alternative method for the timing fix? Broken traces on the board patched by these leads? I'm just guessing...

Title: Re: A1200 hardware patches
Post by: bloodline on October 27, 2003, 08:24:48 PM

Quote

Ryu wrote:
lol, im not quite mad enough to do that :-)

Gah!!! The younger generation..! No balls ;-)

Title: Re: A1200 hardware patches
Post by: lempkee on October 27, 2003, 09:34:51 PM

1: its a keyboard fix afaik! , looks like the one i buyed from ebay? or amibench, it seems that was what it did , you could press more than the regular max keys at same time without blocking the keyboard, sadly that mobo died (sound dissapeared)

2 and 3 i dont know , but it looks like some one tried to do an timer cheat....
but i aint a tekkie at all , i will follow this thread as i am really curious!.

pps: the dood who soldered it used to much heat atleast! :D

Title: Re: A1200 hardware patches
Post by: CU_AMiGA on October 28, 2003, 01:31:01 PM

Interesting.......

Regarding the A1200 keyboard fix, would it be possible to use software to solve the problem or is it hardware only? I might try that! :-)