Hi,
From my Help Disk, no source of document.
I did post this article recently
"Rev 3640 board V3.0.
This revision will not work in A3000's at all (unknown if this also applies to the A3000T and A4000T) because of a conflict with the DMA handling of the onboard SCSI controller and some Zorro cards.
Although it will work with A4000's. A bug in the design allows the board to grant DMA access to more than one device, causing the machine to hang.
There is also a problem with the STERM* signal that can cause sporadic crashes with some cards such as the Cybervison 64. The PAL or GAL chip located at U209 should be -01.
The A3640 was used as the standard processor card in A3000T's, A4000T's and A4000's shipped with 040's. There are three revisions of this card in common use.
The A3640 does not have provision for installing memory directly onto the accelerator, however a 3rd party product called the X-Calibur provided this feature.
At least some A3640s suffer from a serious bug that can drastically reduce the life of the accelerator.
Three capacitors on the board were soldered in the reverse position which can cause them to leak electrolyte over a period of time. These capacitors are labelled C105, C106 and C107. You can verify this by locating position U103, just below the oscillator. Vcc (5V) and G(nd) should be printed on the device.
Check using an ohm meter for a connection between VCC and the black side of the capactors, similarly check for a connection from G to the other side of the capacitors."
Regards, Michael
aka rockape
