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tnt23 · 06 November 2015, 20:12

I have had a closer look at my A3640 and it turned out that it had been upgraded from v3.0 to v3.2, however I don't see any 'cut and jumper' fix on U200 chip. There obviously had been some soldering done, probably the fix had been removed.

Somehow the board was working pretty stable (apart from SCSI issues). I have made cut and jumper fix again, does not seem to make any difference.

The board was said to be prepared for overclocking. Apart from socketed rezonator, there is a delay fix (5ns instead of 10ns). Could this lead to issues if 040 is still running at 25MHz? Should I try to restore 10ns tapping?

06 November 2015, 20:12	#9
tnt23 Registered User Join Date: Feb 2008 Location: Saint-Petersburg / Russia Posts: 324	I have had a closer look at my A3640 and it turned out that it had been upgraded from v3.0 to v3.2, however I don't see any 'cut and jumper' fix on U200 chip. There obviously had been some soldering done, probably the fix had been removed. Somehow the board was working pretty stable (apart from SCSI issues). I have made cut and jumper fix again, does not seem to make any difference. The board was said to be prepared for overclocking. Apart from socketed rezonator, there is a delay fix (5ns instead of 10ns). Could this lead to issues if 040 is still running at 25MHz? Should I try to restore 10ns tapping?