6522 VIA Questions

Date: 2001-08-28 08:42:43

Hi All,

For an up coming project I's considering using this chip, but I would like
to verify some of the hardware functions before committing to it:

I need the following functionality:
1) 8bit latched input, controlled by a line from the peripheral
2) 8bit bufferred output, controlled by a line from the peripheral
3) serial register, loaded by CBM, and shifted by the peripheral, but only
by one bit, then reset by the CBM upon next load.

The choice I'm facing is whether to use the 6522 or the 8255. The 8255
doesn't have a serial port (will need TTL chip), but has a bi-directional
mode on port A which saves on a external 74373/573 buffer that I would need
with the 6522.

Is either chip more attractive from a C64 interfacing point of view?

Regards, Nick


The contents of this email (including any attachments) may be
privileged and confidential. Any unauthorised use of the contents
is expressly prohibited. If you have received this email in error,
please advise us immediately (you can contact us by telephone
on +61 8 9441 2311 by reverse charge) and then permanently
delete this email together with any attachments. We appreciate
your co-operation.

Whilst Orbital endeavours to take reasonable care to ensure
that this email and any attachments are free from viruses or other
defects, Orbital does not represent or warrant that such is explicitly
the case

(C) 2000: Orbital Engine Company (Australia) PTY LTD and its

       Message was sent through the cbm-hackers mailing list

Archive generated by hypermail 2.1.1.