PLUS4 PRODUCT SPECIFICATION (Continued)
FEATURES
Built-in extended
BASIC 3.5
-- over 75 commands.
Built-in Machine Language monitor
-- over 12
commar.ds.
Built-in graphics andsound commands.
Screen window
capability.
Reset button (Warm
start). Built-in integrated
productivity
software.
PERIPHERALS
C1551 Fast Disk drive,
C1531 Datasette,
MPS 802 Dot
matrix printer, MPS 803 Dot
matrix printer,
DPS 1101
Daisy wheel printer,
C1802
color monitor.
OTHER PERIPHERALS
C1541
Disk drive,
MPS 801
Dot matrix printer,
C1702
color monitor.
PLUS 4 OVERVIEW
The Plus 4 system isbased on the 7501
microprocessor,
anHMOS version
of the 6510.
Video pro-
cessing is achieved
bythe 7360
TED chip. 64K bytes
of dynamic RAM areaccomplished
by 8 (64K
x 1) I.C.'s.
(See page
).The system program iscontained
in2 (16K x 8) ROMs.
The system supports
up to 128K x 8 of
ROMbanked in16K sections.
By software
control, through the 7360,
ROM can
be completely
banked out and RAM banked infor
atrue 64K of
RAM (minus 256 bytepages),
allow-
ing 60,671
bytes available for BASIC.
Keyboard and joystick
scanning are accomplished
by outputting
the row data onthe data buswhile
addressing aparticular
register inthe TED chip.
This will inturn cause the TED chip to latch the column
information.
Astandard
serial port supports
serial bus peripherals
such asthe
1541 disk drive andthe various
serial printers. Acassette
port isprovided andthe expansion
port supports ROM cartrdiges.
TTL serial
ASCII is intended
to drive anRS-232
adapter.
22
Summary of Contents for Plus 4
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