Re: virtual hand jive and human factors

Hi Alan "R",

The 16C63's are good, I have a small cache of 16C73's. I don't have a
development system, so I might even test on the new 16F877's (when I get
them). 'F84 enough? Are you willing to share some code for the PIC and
the TSR? Hate to reinvent the wheel. I think Ballendo is interested
also. Are you using 'C' or .ASM?

I agree on using BIOS or DOS calls as much as possible. Are you
revectoring int 9 (? keyboard int) also?

Yeah, CPM BIOS work taught me a little. Wrote one for the MAD 300 'élan
processor ('386 imbedded) recently. And Socket Services, Memory
Manager, Data Acquisition...

Alan (KM6VV)


Alan Rothenbush wrote:

>
> Too many Alan's in this conversation .. I'm not sure which one of
> this is directed to, but here's a few thoughts.
>
> 1. I used a 16c63 in the pendant, but there's no need to use such an
> expensive one. Even a C54 will do the job. I just happen to have a bunch
> of c63s laying around AND a nice development tool, so I tend to use them
> for almost everything.
>
> 2. Since CNCPro DOES seem to use legal calls, I would strongly discourage
> poking values directly to a memory location, as that is generally considered
> "illegal". Moreover, it's unnecessary .. Int16h function 5 does exactly
> what's needed in an "approved" manner.
>
> I do know where you're coming from though .. I cut my teeth on 8080s running
> CPM. When I started writing PC code on 4.77 MHz PCs, I used every trick in
> the book to avoid using the BIOS for anything. Now that our computers are
> oh, 50,000 times faster, there's very little reason to NOT use the BIOS.
>
> 3. Little glitch in my pendant. CNCPro uses both KEYPRESS info as well
> as KeyUP ( and MAYBE KeyDOWN ) info. KeyPress codes are used for just about
> everything, near as I can tell, except that KeyUp is used during fast and
> slow jogs.
>
> That is, CNCPro will begin a jog when an arrow key is pressed, and continue
> a jog as long as an arrow key is pressed. Only upon a KeyUp event is the jog
> terminated.
>
> There is no good way to "legally" stuff KeyUp info into the keyboard buffer,
> meaning that when the pendant sends an "arrow key" to begin a jog command, the
> jog would normally continue on until the limit switches are tripped.
>
> Thankfully, there is a simple enough way out. CNCPro seems to monitor the
> ESC key at all times. When an arrow key on the pendant is released, I have
> the PIC send an ESC key as well. This terminates the jog.
>
> 4. > Simon Fraser University? BC?
>
> Yup !
>
> Alan
>
> --
>
> Alan Rothenbush | The Spartans do not ask the number of the
> Academic Computing Services | enemy, only where they are.
> Simon Fraser University |
> Burnaby, B.C., Canada | Agix of Sparta
>
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