Commodore Amiga - Page 287

••••••• * •• PART 4 - PORT SIGNAL ASSIGNMENTS FOR 8S20 .***********
Address BFFROl data bits 7-0 (Al2*) (int2)
PA7 •• game port 1, pin 6 (fire button*)
PAG .. game port 0, pin 6 (fire button·)
PAS •. RDY* disk ready*
PA4 •. TKO. disk track 00*
PA3
•• WPRO* write protect·
PA2 .• CHNG* disk change·
PAl .. LEO. led light (O=bright)
PAO •• CNL memory overlay bit
SP ••• KDAT
CNT •• KCLK
PB7 •. P7
PBG •. P6
PBS .. PS
PM •. P4
PB3 .. P3
PB2 •. P2
PBl. .Pl
PBO •. PO
PC ••• drdy*
F •••• ack·
keyboard data
data 7
data 6
data S
data 4
data 3
data 2
data 1
data 0
Centronics parallel interface
data
Centronics control
Address BFDRFE data bits lS-8 (Al3.) (int6)
PA7 •• com line om., driven output
PA6 •• com line RTS., driven output
PAS •. cam line carrier detect·
PA4 •• com line CTS·
PA3
•• com line OSR.
PA2 .. SEL Centronics control
PAl •. POUT paper out ---+
PAD •• BUSY busy ---+ I
I I
SP ••• BUSY cO!llllOdore -+ I
CNT •. POUT cO!IIIlOdore ---+
PB7 •. MTR.
PBG .. SEL3.
PBS .. SEL2.
PM •. SEL1.
PB3 .. SELO.
PB2
•. SIDE·
PBl. .DIR
PBO •• STEP*
t:I:j PC ••• not used
motor
select external 3rd drive
select external 2nd drive
select external 1st drive
select internal drive
side select·
direction
step·
F •••. INDEX. disk index·