MITS 2SIO serial chip?

From: Allison <ajp166_at_bellatlantic.net>
Date: Wed Dec 19 08:59:16 2001

From: Ben Franchuk <bfranchuk_at_jetnet.ab.ca>
>But then I find 6800/6809 code more readable than "You Know Who"


I kinda figured that. Just like I prefer Z80 opcodes to 8080 as they
are more regular in format.

>This will be simple polled loop with interrupts disabled regardless

>of what chip I use. I would love to have had DMA but I ran out resources
>for it. In fact DMA is rather messy as I don't tri-state the address bus


Polled loop has speed requirements and the problem of what to do
if the FDC never sees dat and has to error out.

>and would have to stop the CPU for a free memory cycle. If I was
>doing this on a I/O card I most likely would have a sector buffer
>their rather than dma.


The last design I did that way save for ram was cheap by then so
I did a full track buffer.

Allison
Received on Wed Dec 19 2001 - 08:59:16 GMT