Linux-Hams archive - June 1999: New SCC card design

New SCC card design

Jason Flynn (bbsqnwy.ytqe@randstad.com)
Thu, 03 Jun 1999 17:21:43 +0100

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!

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 ?

73 Jason

PS can anyone explain exactly what the bug in the
z8530 is that everone complains about ?

PPS can anyone point me to an online manual for
the 85C230?