Sharp MZ-5500 Tehnical Manual

14. PSG (Programmable Sound Generator)
One channel of the PSG is provided for the MZ-5500/5600 series to generate
eight o~tave, triple chords, and it has the following configuration.
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AY-J-81ll...
I öl< () Iro,., flJC
' ~~-I!---+
[öwl( {ro ...
IAf!i.
rVL
BDIR
Bel
A
!3 t----t---t
C
x-r
t-5."
~
J,.
SF'eak.er-
(3H)
Re~et
-----------(1 RHn
Al.d:ö
5JT
iA'1G
S
DA?
'
SL~
SL 1
t--Sl2.
J--sL3
M~N
4HHi ' I CLÖlk
HA61
HAl
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Fig.14-1 PSG cireuit
Operational theory
°The figure above shows the AY-3-8912. PSq which can
address of 230H - 23FH.
As there are 16 registers in the PSG, control is do
cornrnand in the above 1/0 address. Those registers
as to enable to know the current state and d, ata
be
are
in
ne b
accessed by
permitted to
the memory.
y writing the
the
cont
read
Once
1/0
rol
so
1 h
registers have been prograrnrned, eontrol is done via those registers to
generate sound and manage it and the CPU is therefore open for other jobs.
°Not only the PSG ineorporates the sound generating funetion, but, it also
has the 8-bit parallel 1/0 port on which the mini-f loppy di sk in ter f nee
drive select sfgnal (SLO-SL3), motor-on signal, and address bank selec t
signal (AOOOOH-BFFFFH) are sent.
°Three sound signal outputs (A, B, C) from the PSG are ORed in the anD10?
mode to drive the speaker via the TA7313 Audio Amplifier and sent. through
the AUDlO OUT jack via the emitter follower transistor.
°The pin configuration and functions are shown in the next page.
°pSG related 10CS
The following three modules are provided for the lOCS whi ch co ntr o l s t ll P PS G.
For detail, refer to Section Three, Software. For detail of the rSG, refer
to the PSG Descriptions published by GI.
MUSIC:
Drives tIte PSG with the contents of the musie note.
ElviUSIC:
Data are direetly set in the ehannel A of the PSG to generate sound.
ZMUSIC:
Similar as MUSIC.
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Sharp MZ-5500 Specifications

General

Brand	Sharp
Model	MZ-5500
Category	Desktop
Language	English