Specifications

; main sound loop here
loop
sta $e848
nop
inca
until eq
; turn sound off
Ida #$00
sta $e84a
sta $e84b
swi
end
"sound1.b09" which causes enough delay to render a
sound audible. I suggest you look for
it (you'll learn a lot while looking); if nothing
seems to work, see the end of this column.
Now that we've examined the rudiments of producing
sound in 6809 assembler, perhaps you will want to
try your hand at composing some simple songs. Try
creating a table of notes for the X register and
a table of delays for the Y register. The tabled
references will let you play sequences in turn to
create a song.
The next two articles will be devoted to two trouble spots: structured pro
programming statements, and determining the correct branch statement to use. The
topics will be presented without quizzes. Note: Your 6809 delay is: SYNC.
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AM INDEX : COMING UP* This issue, we print an index of all Gazette issues
PRINTING APL, TWO NEW from No. 2 through this one. It is not page-numbered,
DISKS, A STARTER-PAI and can be removed from this issue if you want to file
it in a 3-ring binder. We'll keep on printing Vol. I
until we have enough pages to fill a 1.5-inch ring binder; then we'll start with
Vol. II. Next issue, we have excellent material by Terry Peterson and Reg Beck
on how to send the APL character set to MX80 and FX80 printers. AND: coming up,
Terry Peterson's and Gary Ratliff's extended monitors on an ISPUG utility disk,
together with a bunch of finished machine-language utility programs you can pick
and choose from, AND a new 'Starter-Pak' which tells beginners how to start us
ing SuperPET, with a tutorial disk (all the things the manuals do not cover, and
which drove all of us up the wall when we first cranked up SuperPET). Both pack
ages are just about finished; the Starter-Pak is designed especially for use in
schools, and may be copied by schools for use by teachers and students. Please
don't order either disk/manual until we announce they are ready.
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Prices, back copies, Vol. 1 (Postpaid), $ U.S.
No. 1: not available No. 4: $1.25 No. 7: $2.50 No. 10: $2.50
No. 2: $1.25 No. 5: $1.25 No. 8: $2.50 No. 11: $3.50
No. 3: $1.25 No. 6: $3.75 No. 9: $2.75
Send check to the Editor, P0 Box 411, Hatteras, N.C. 27943* Add 30% to prices
above to cover additional postage if outside North America. Make checks to ISPUG
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APPLICATION FOR MEMBERSHIP, INTERNATIONAL SUPERPET USERS' GROUP
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SuperPET Gazette, Vol.I No.11
-179-
December 1983/January 1984