--- Sam Laur <slaur@utu.fi> wrote:
> "Baltissen, R (Ruud)" wrote:
> > On the board is one IC unkown to me, a 6854...
>
> Lo and behold, Google gave me this link:
> http://www-uxsup.csx.cam.ac.uk/~bjh21/BBCdata/MC6854.pdf
> Seems to be a bit broken but anyway - HDLC/SDLC controller chip.
Makes sense. The 6850 is a serial chip, as is the 6851 and 6852 (found
one in a pile of parts last month - not sure what it came out of)
> No idea on whether you can get any chips anywhere. I'd guess not.
Probably not. Now... if you wanted to make a modern, network-end compatible
(not software compatible) device, you could use the Z8530. It is the same
chip found in the Mac and older Sun SPARCstations. We used to use them for
speaking HASP, 3780 and SNA to big IBM boxes. It's a little messy to hook
to a 68000 (and by extension, the 6502), and you do have to alternate
accesses (stuff a register number in one spot, then read/write that register
from the other spot), it is a decent chip.
-ethan
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