1.D.4 A1200 Timing Fault

[scafe]

I know that pre-1995 commodore manufactured A1200's suffer from a number of manufacturing faults in the form of a timing fault and some sort of CC-RESET fault on the GAYLE custom chip. However my board is not usual, having experienced no problems with my A1200 i was unbeknownst to this fault, but when checking the info printed on the board i was shocked to find i owned a Commodore manufactured 1.D.4 revision board which is the revision known to have this fault. However my board is dated 1996 not 1992 as pictures on the net would suggest, and has the layout of the later Amiga International maufactured boards. To add firther confusion to the matter my board is fitted with 3.0 roms rather than 3.1's and is accompanyed by a number of patch wires which appear to have been soldered at the factory to my rom chips? Why has this been done as out of all the images of A1200 board's i have seen none have this on the rom chips :-? I did buy this A1200 new around mid 1996, could this be an old Commodore mainboard repaired by Amiga International during the takeover?

[bloodline]

Weird...  :-?

[Staticman]

scafe wrote:
I did buy this A1200 new around mid 1996, could this be an old Commodore mainboard repaired by Amiga International during the takeover?

Yes it certainly looks that way.

[StevenJGore]

scafe wrote:
...and is accompanyed by a number of patch wires which appear to have been soldered at the factory to my rom chips?

Now that's interesting...

I've had five separate A1200's in my possession over the years, and only one had the patch wires soldered to the ROM chips (short green wires to be precise). The A1200 that had these soldered wires was bought in late 1993, but I can't remember the motherboard revision. Out of my four other A1200's, three were Commodore A1200's and one (my pride and joy!) is an Amiga Technologies A1200. None of them have soldered wires.

What exactly do the wires do?

scafe wrote:
...pre-1995 commodore manufactured A1200's suffer from a number of manufacturing faults in the form of a timing fault and some sort of CC-RESET fault on the GAYLE custom chip.

Until I read this thread, I hadn't even heard of this, but I'm assuming that these faults aren't too serious? How are the above faults evident or noticeable during everyday use of the machine?

Presumably my AT A1200 doesn't have them?

Steve.

[scafe]

StevenJGore wrote:
Presumably my AT A1200 doesn't have them?

Steve.

 Thats right the Amiga Technoligys version removed these faults however with the inclusion of new EU laws the RF module on the board was replaced causing incompatibilitys with some Televisions as far as i know this is only the case with the later boards and only affects older TV's connected via the RF port

[amigamad]

2 of my a1200,s are  1.D.4 versions i have never had a problem with them even with my ppc card and graphics card,s clockport serial adaptor and ide interfaces .I think the amiga Technoligys a1200 i have is a revision 2b .

[scafe]

amigamad wrote:
2 of my a1200,s are  1.D.4 versions i have never had a problem with them even with my ppc card and graphics card,s clockport serial adaptor and ide interfaces .I think the amiga Technoligys a1200 i have is a revision 2b .

great!! thats ace because i've just ordered one of those EZIDE 4 way interfaces from eyetech and i was worried it would refuse to work with my A1200 mboard, and i can gather from yours that its safe to order and add the accelerator, scandoubler, and EZKBD interface that i plan to add as soon as i get some money flowing.  :-D

[Stedy]

The Rev 2B A1200 motherboard also has timing problems, I have first hand experience of this!

Take a look at:

http://www.haigh1.freeserve.co.uk/Apollo_crashing.htm

I have an Apollo 1240 and Commodore rev 2B motherboard, would not boot until I removed the capacitors.

You may be OK, it seems to depend on the accelerator you have and some Amiga Technologies boards were fixed.