Zippy v1.1
By Andy McFadden (fadden@uts.amdahl.com)

Public domain software -=- Free distribution encouraged
______________________________________________________________________________


Zippy is a ProDOS 8 SYS program which allows you to change the settings of
the ZipGS accelerator.  It can do everything that the Zip CDA can, and I
think it looks prettier, too.

Using Zippy is pretty much self-explanatory.  All options work on a single
keypress.  For example, "S" (upper or lower case) will toggle the speaker
delay, turning it on if it was off and off if it was on.  The "E" and "D"
keys don't toggle; they simply enable and disable the ZipGS.  All of the
available commands are shown at the bottom of the display.

After you change the settings to your liking, press <RETURN>, and the changes
will be made.  If you decide that you don't want the changes after all, press
<ESCAPE> and Zippy will quit without changing anything.


If you use a program selector like ProSel, you can automate enabling and
disabling of the board.  Zippy checks the startup buffer when it begins, and
if it sees a word beginning with "E" or "D", it enables or disables the board,
respectively.  It then quits immediately.  So, from ProSel, you could use
a screen entry like:

    Title:    Zip Disable
    Prefix:   ?ZIPSTUFF
    Program:  ZIPPY
    Startup:  DISABLE

Selecting this entry would cause Zippy to disable the board, and then quit
back to ProSel.


I have included the complete source code for people who might want to modify
it to do other things, like maybe use it as a pre-boot for games (so it
would reset the speed and execute the game, all in one step).  The screen
display routines may also be of interest to assembly programmers who want
to get more color into their programs.  (Applesoft programmers should refer
to the "Fancy Text" demo I did a few months back; it's probably archived as
"fancy.bsq".)

Zippy v1.1 determines the ZipGS's maximum speed the same way that the ZipGS
application does (see the source code for details).  To simplify processing,
Zippy rounds the maximum speed down, so that a 7.5 MHz board would appear
as 7 MHz (as far as I know though, all boards are sold with integer speed
ratings).  Note that the speed rating is only for display; even if it's dead
wrong, the program will still behave correctly (speeds are set in increments
of 6.25%, regardless of the maximum).

Note also that the cache size is for display purposes only, and WILL be wrong
if you have a split cache mod.  It uses whatever value is returned by the
board, which uses whatever the dip switches are set to.  So if you have a
64K cache and set the dip switches to 32K to do the split mod, Zippy will tell
you that you only hae 32K.


Zippy was written in 3 sessions of roughly two hours each, so the code has a
certain ad-hoc quality about it.  I make this statement so that people don't
think ALL my programs come out looking like this one. ;-)

DISCLAIMER, ETC:
Once again, this program is in the public domain, and may be distributed in
any way you like.  It's not copyrighted, it's not freeware, it's just plain
PD.  I waived all my rights, but in return I waive all responsibility for the
performance and maintenance of this program.  If it trashes your hard drive,
I'll feel bad, but it's not my problem.  If you want the product improved, go
ahead and improve it.  (this sounds a little harsh, but I want to make it
clear so that nobody sicks their vampires on me...)

That's all, folks...