[Coco] the bit-banger
gene.heskett at verizon.net
Fri Jul 11 18:14:20 EDT 2008
On Friday 11 July 2008, Chuck Youse wrote:
>Does anybody _really_ use this in a *S9 setup?
ATM I am Chuck. I needed a printer & you can't buy one that understands ascii
now for several years. So I grabbed a usb<->serial adapter and a couple of
long usb extension cables, and I'm feeding /p to this box at 9600 baud, where a
script watches that usb port and collects the data. When the data stops, it
turns around and sends it to lp3, which is a 110 dollar brother laser printer
sitting on the top shelf of the coco's desk.
Sort of Rube Goldburgish, but it worked till a lightning strike right on top of
me sent a surge, and the coco isn't on the same power leg as everything in this
room is, so it blew the adapter. I bought some more just like it, but somehow
that one is sending trash and I haven't had the time to scope it out and see
if /p is still at 9600 baud, I had to play with tuneport because it was closer
to 15kbaud originally.
>I'm sorely tempted to
>disconnect the interrupt line (SERINT) from the GIME chip in my system
>and hook it to the cartridge port so I can generate FIRQ* from the
>expansion bus... and no, I can't just tie the interrupt to FIRQ*
>directly, I need a means to enable/disable the interrupt individually.
>The ability to dynamically change it between FIRQ* and IRQ* is also
>ridiculously useful (for the FDC anyway).
>Mind you, _I_ don't use the bit-banger (I use a UART for RS-232, use of
>the bit-banger REALLY eats CPU cycles), but I'd rather find the
>least-intrusive mod for others who might want to use this FDC ..
>I'll also see if using the interrupt mechanism on PIA1 is feasible.
>Coco mailing list
>Coco at maltedmedia.com
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