Hi Jason.
> I've been looking into designing a new SCC card for packet and
> making the PCB masks freely available on the 'net. I've
> currently got a USCC and a S5SCC card and I've had a good look
> at how each of them work. I feel that a PCI based card is beyond
> my capabilities so I'm talking ISA!
As long as it's possible to select ANY interrupt line, rather than
being limited to the low interrupts as so many designs are, ISA only
is fine from my point of view. I have a BayCom USCC card here, and
it's useless because of its insistance on using either IRQ5 or IRQ7 as
both are already occupied!!!
> I came up with a few points I wanted to discuss with people:
> 1) What IC would be a good move 85C230 or 16C3x or
> something different again ?
> 2) What is a good way of getting the data of the SCC IC?
> ISA DMA? DMA into on card memory mapped RAM ?
> 3) What are the issues with running both channels of a Dual
> channel IC in DMA mode?
> 4) What are the issues with running full duplex and DMA ?
> 5) Can anyone explain exactly what the bug in the z8530 is
> that everone complains about ?
> 6) Can anyone point me to an online manual for the 85C230?
Sorry, I can't help with any of those.
Best wishes from Riley.
+----------------------------------------------------------------------+
| There is something frustrating about the quality and speed of Linux |
| development, ie., the quality is too high and the speed is too high, |
| in other words, I can implement this XXXX feature, but I bet someone |
| else has already done so and is just about to release their patch. |
+----------------------------------------------------------------------+
* ftp://ftp.MemAlpha.cx/pub/rhw/Linux
* http://www.MemAlpha.cx/kernel.versions.html
