Specifications
TABLE
VII
QUARK
PIN
CONNECTIONS
AND
FUNCTIONS
(CONTINUED)
PIN
C-1
C-2
C-3
C-4
C-S
C-6
C-7
C-8
C-9
C-10
C-11
C-12
C-13
C-14
C-15
C-16
C-17
C-18
C-19
C-20
C-21
C-22
C-23
C-24
C-25
C-26
C-27
C-28
C-29
C-30
C-31
C-32
GROUP
DESCRIPTION
CRT
HorizontaL
sync
output
(BLUE
output
on
QUARK/1S0)
FULL-DUP
RS-232C
RxD
seriaL data input to
ACIA
FULL-DUP
RS-232C
DTR
output (driven
by
PIA
PS7)
FULL-DUP
RS-232C
CTS
input to
ACIA
CRT
Composite
video output
(COMPOSITE
SYNC
on
QUARK/1S0)
P3
VIA
PS2
paraLLeL
I/O
Line
P3
VIA
PSO
paraLLel I/O
Line
P3
VIA
PB4
parallel
I/O line
PAR
PTR
ParalLeL
printer
interface output
bit
4
PAR
PTR
Parallel
printer
interface output
bit
3
PAR
PTR
ParaLLeL
printer
interface output
bit
6
PAR
PTR
Parallel
printer
interface outputbit 1
PAR
PTR
ParalLel
printer
interface data strobe output
EXP
BUS
ZSOB
address
bus
A3
EXP
BUS
Z80B
address
bus
AS
DISK
Read
data input
from
floppy disk (active
low)
DISK
Direction controL output
to
floppy
DISK
SEL
2 floppy disk drive
select
(active
low)
~
__
(active
low)~·~--·
DISK
SEL
1
fLoppy
disk drive seLect
(act
i
ve
low)
DISK
Write data output to
fLoppy
disk drive (act i
ve
low)
P1
PIA
PA1
paralLel
I/O
line
(KBD1)
P1
PIA
PA3
paralleL I/O line
(KBD3)
P1
PIA
PAS
paraLleL I/O
Line
(KBDS)
EXP
BUS
Z80B
address
bus
AO
EXP
BUS
Z80B
data
bus
DO
EXP
BUS
ZSOB
data
bus
D2
EXP
BUS
ZSOB
data
bus
D4
EXP
BUS
ZSOB
data
bus
D5
DISK
FLoppy
disk write protect sense input (active
low)
RESERVED
Reserved for future hard disk version
RESET
Reset input (active
low)
POWER
+12
V reguLated input
1.
P1, P2,
P3
refer
to
general-purpose paralleL ports
1,
2,
and
3.
In standard
Quark
operating systems port
P1
is
configured
as
a standard encoded-keyboard data input, with
CA2
of the
PIA
as
the
keyboard
data strobe input.
2.
EXP
BUS
refers
to
the set of connections to the
ZSO
address,
data,
and
control
lines,
and
to the E-clock
and
external chip-seLect Lines.
These
lines
form
the Peripheral Expansion
Bus.
3.
DISK
refers
to
connections for the floppy disk drives.
4. All inputs
and
outputs for the
Parallel
Printer
(PAR
PTR)
interface are TTL-compatible.
S.
The
Full-duplex
Serial
Port
(FULL-DUP)
is
implemented
using the
ACIA
and
PB7
of the
PIA.
6.
The
SimpLex
Serial
Port
(SIMPLEX)
is
impLemented
using the
VIA.
7.
For
proper operation, the composite video output should be terminated
by
a bridging
7S
ohm
load at the monitor.
8.
Bit 0
is
the
least-significant,
bit
7 the most-significant.
MegateL
Computer
Technologies Toronto,
Canada
Appendix
Page
A-11