The CBM-II models were Commodore's last effort to
capture the business market with it's superior proprietary technology.
This line actually did fairly well in the small
business realm, but was eventually scrapped for the PC-clones. This
line includes the B500, B128, B256, B128-80HP, B256-80HP in the U.S.,
and the CBM 500, 610, 620, 700, 710, and 720 in Europe. The 610 and 620 correspond
to the B128 and B256 respectively, while the CBM 710 and 720 correspond
to the B128-80HP, and B256-80HP respectively.
All the machines in this line are distinguished by the MOS 6509 processor,
Commodore BASIC 4.0 (like that found in the later
CBM/PET computers, the Commodore "SID" sound chip, an RS232-C port, IEEE-488 peripheral
compatibility, and 80 column text video capability. Shown here on the
right is the 128k B128 computer.
The B128, B256, B500, CBM 500, CBM 610, and CBM 620 constitute the "Low Profile" CBM-II
machines. A single integrated unit featuring a full business keyboard,
numeric keypad, and 12 function keys. The B128 pictured above
includes 128K of banked memory (64K maximum
in each bank).
Statistics, features, and B128 resources:
Expandable to 256k internal, 704k external
CBM Basic 4.0
MOS Technology 6545 CRTC
9" Monochrome display
40 columns x 25 rows
MOS 6581 SID
3 voice stereo synthesizer/digital sound capabilities
Male edge-connector IEEE-488 port
Male edge-connector CBM Datasette port
Female RS232 port
Round DIN CBM Monitor port
Female edge-connector CBM-II/PET-II expansion port
1 RCA audio port
Power and reset switches
Full-sized 102 key QWERTY
19 key numeric keypad!
4 direction cursor-pad
Personal Note:The CBM-II line are personally very
cool to me. I used to sit and
write little BASIC programs on these things, but they fell out of favor
as my collection grew, so now they are all boxed up. The B128 I acquired
on a tip from another collector.