Specifications
-------
TABLE
VI
SUGGESTED
VALUES
FOR
THE
SAM
CONTROL
REGISTER
VIDEO
MEMORY
fVERT
MODE
F6
F5
F4 F3 F2
F1
Fa
ADDRESS
RANGE
---
60Hz
ALPHA
a a
1 1 1
a a
3000-3FFF
60Hz
ALPHA
a
1 1
1
1
a a
7000-7FFF
60Hz
ALPHA
1
a
1 1 1
a a
BOClO-BFFF
60Hz
ALPHA
1
1
1 1 1
a
a
FOOO-FFFF
60Hz
GRAPHICS
a a
1
1 a a
a
2000-7FFF
60Hz
GRAPHICS
0
1 1 1
a
a
0
6000-BFFF
60Hz
GRAPHICS
1
a 1 1
0
0
a
AOOD-FFFF
50Hz
ALPHA
0 0
1 1 0 1 1
2COO-3FFF
50Hz
ALPHA
a
1
1
1
0
1
1
6COO-7FFF
50Hz
ALPHA
1
a
1
1
a
1
1
ACOO-BFFF
50Hz
ALPHA
1 1 1 1 0
1
1
ECOD-FFFF
50Hz
GRAPHICS
0 0
1
0 a
1
0
080D-7FFF
50Hz
GRAPHICS
a 1
1
0 0
1
0
48OD-BFFF
50Hz
GRAPHICS
1 0 1 0 a 1 0
8800-FFFF
Notes:
1.
The
starting
address is calculated
from
the
polynomial
SA=(F6)*215+(FS)*214+(F3)*213+(F2)*212+(F1)*211+(FO)*210.
Thus
the
starting
address is the binary
number
(F6)(FS)(F3)(F2)
(F1)(FO)00
0000
0000.
---
2.
The
final address is the
first
16k
boundary
following the
starting
address in
Alphanumeric
mode,
or the
second
16k
boundary
following the
starting
address in Graphics
mode.
3.
Bit
F4
in the
SAM
Control Register
must
always
be one.
4.
On
Quarks
with
128k
memory,
the
Video
Memory
is located in the
memory
bank
determined
by
bit
0 of the I
register.
5.
In
Graphics
mode,
the
starting
address
must
be
on
a
3k
boundary.
------_.
---_._-----,--------------,----
TABLE
VII
QUARK
PIN
CONNECTIONS
AND
FUNCTIONS
PIN
GROUP
DESCRIPTION
--------------------------------------.-------.--------.-.-.0---
A-1
CRT
Ground
A-2
CRT
VerticaL
sync
output
(RED
output
on
QUARK/150)
A-3
FULL-DUP
RS-232C
transmit data
from
ACIA
(full-duplex port)
A-4
SIMPLEX
RS-232C
transmit data
from
VIA
A-5..
FULL-DUP
Ground
A-6
P3
VIA
PB1
paralLel
I/O
line
A-7
P3
VIA
PB3
parallel
I/O
line
A-8
P3
VIA
PB5
parallel
I/O
line
A-9
PAR
PTR
Parallel
printer
output
bit
7
A-10
PAR
PTR
ParalLel printer output
bit
5
A-11
PAR
PTR
Parallel
printer
output
bit
2
A-12
PAR
PTR
Parallel printer output
bit
a
A-13
PIS
PTR
Ground
for
parallel/serial
printer
A-14
EXP
BUS
User
chip select output (active
low)
A-15
EXP
BUS
E-CLK
output
A-16
DISK
Ground
Megatel
Computer
Technologies Toronto,
Canada
Appendix
Page
A-9