<storage> A 3.5-inch floppy disk drive for the Amiga.
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<computer> (C128) An expanded Commodore 64. The C128 was Commodore
Business Machines' last commercially released 8-bit computer. However, they did
prototype the Commodore 65 and Commodore SX64.
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Commodore 128 » Commodore 1541 » Commodore 1570
» Commodore 1571
<storage> The best know floppy disk drive for the Commodore 64. The 1541
was a single sided 160 Kb drive but converting to flippy disks would give
another 160 Kb.
The disk drive used Group Code Recording and contained a 6502 processor as a
disk controller. Some people wrote code for it to vibrate the head at different
frequencies to play tunes.
The transfer rate was about 300 bytes per second. The 1541 used a bit-serial
version of the IEEE 488 parallel protocol. Some third-party speed-ups could
transfer about 4 kilobytes per second over the interface, and some "fast
loaders" managed up to 10 kbps.
The Commodore 1570 was an upgraded 1541 for use with the Commodore 128.
comm mode « Commodore 1010 « Commodore 128 «
Commodore 1541 » Commodore 1570 » Commodore 1571
» Commodore 1581
<storage> Commodore Business Machines's allegedly "advanced" disk drive
for use with the C128. It is basically a 1541 with the capability to use "burst
loading" (like the Commodore 1571), and lots of new bugs.
The Commodore 1571 was a double-sided version of the 1570.
Commodore 1010 « Commodore 128 « Commodore 1541 «
Commodore 1570 » Commodore 1571 » Commodore 1581
» Commodore 64
<storage> Commodore Business Machines's "advanced" disk drive for the
C128. It was the double-sided version of the Commodore 1570 disk drive but,
unlike the 1570, worked quite well.
The 1571 supported "burst mode" loading when used on a C128 in native mode,
which increased the transfer speed from 1541 speed to about three kilobytes per
second (about a 10-fold increase). The 1571 could be told to emulate a 1541 for
use with a C64 or 1541 disks.
Bugs in early releases of the 1571 ROM affected access to the second side of the
Commodore 128 « Commodore 1541 « Commodore 1570 «
Commodore 1571 » Commodore 1581 » Commodore 64 »
<storage> Commodore Business Machines's 3.5 inch disk drive for the
Commodore 64 and Commodore 128. The drive stores 800 kilobytes using an MFM
format which is different from both messy-dos 720 kb, and the Amiga 880 kb
The 1581 supports a poor imitation of directories which are really just
partitions and largely unused. It also supports burst loading like the Commodore
1571, but is actually faster as it is better designed. It has 3160 blocks free
The 1581 is the highest density C64 serial bus drive made by Commodore. However
Creative Micro Designs (CMD) make the FD2000 (1.6MB) and (until recently) the
FD4000 (3.2MB) 3.5" disk drives. GEOS users like 1581s as they are very fast
when used with GEOS.
See also Commodore 1541, Commodore 1571.
Commodore 1541 « Commodore 1570 « Commodore 1571 «
Commodore 1581 » Commodore 64 » Commodore 64DX »
<computer> (C64) An 8-bit Commodore Business Machines personal computer
released around September 1981. Prototypes were (apparently) made before
Christmas 1980 (and shown at some computer fair).
The CPU was a 6510 from MOS Technologies (who were a wholly owned subsiduary of
Commodore at this time(?)). The C64 had 64 kilobytes of RAM as standard and a
40-column text, 320x200 pixel display generating composite video, usually
connected to a television.
DMA-based memory expanders for the C64 (and C128) allowed 128, 256, and 512 kb
of RAM. Several third party manufacturers produce accelerators and RAM expanders
for the C64 and C128. (Some, risking a holy war, compare this to putting a brick
on roller-skates). Such accelerators come in speeds up to 20MHz (20 times the
original) and RAM expanders to 16MB.
The C64's 1541 5.25 floppy disk drive had a 6502 processor as a disk controller.
See also Commodore 65.
["Assembly language programming with the Commodore 64", Marvin L. De Jong].
Commodore 1570 « Commodore 1571 « Commodore 1581 «
Commodore 64 » Commodore 64DX » Commodore 65 »
Commodore Business Machines
Commodore 1571 « Commodore 1581 « Commodore 64 «
Commodore 64DX » Commodore 65 » Commodore
Business Machines » Commodore SX64
<computer> (Or Commodore 64DX, C65, C64DX) The last 8-bit computer
designed by Commodore Business Machines, about 1989-1991. The C65 boasts an ugly
collection of custom integrated circuits which makes even the Amiga hardware
The core of the C65 chipset is the CSG 4510 and CSG 4569. The 4510 is a 65CE02
with two 6526 CIAs. The 4569 is equivalent to a combination of the 6569 VIC-II
and the MMU of the Commodore 64. The C65 also has a DMA controller (Commodore's
purpose built DMAgic) which also functions as a simple blitter, and a floppy
controller for the internal Commodore 1581-like disk drive. The floppy
controller, known as the F011, supports seven drives (though the DOS only
supports 2). The 4510 supports all the C64 video modes, plus an 80 column text
mode, and bitplane modes. The bitplane modes can use up to eight bitplanes, and
resolutions of up to 1280 x 400. The palette is 12-bit like the Amiga 500. It
also has two SID's (MOS 8580/6581) for stereo audio.
The C65 has two busses, D and E, with 64 kilobytes of RAM on each. The VIC-III
can access the D-bus while the CPU accesses the E-bus, and then they can swap
around. This effectively makes the whole 8MB address space both chip ram and
fast ram. RAM expansion is accomplished through a trap door slot in the bottom
which uses a grock of a connector. The C65 has a C128-like native mode, where
all of the new features are enabled, and the CPU runs at 3.5 megahertz with its
pipeline enabled. It also has a C64 incompatibility mode which offers approx
50-80% compatibility with C64 software by turning off all its bells and
whistles. The bells and whistles can still be accessed from the C64 mode, which
is dissimilar to the C128's inescapable C64 mode.
Production of the C65 was dropped only a few weeks before it moved from the
Alpha stage, possibly due to Commodore's cash shortage. Commodore estimate that
"between 50 and 10000" exist. There are at least three in Australia, about 30 in
Germany and "some" in the USA and Canada.
Commodore 1581 « Commodore 64 « Commodore 64DX «
Commodore 65 » Commodore Business Machines »
Commodore SX64 » COMmon Algorithmic Language
Commodore Business Machines
<company> (CBM) Makers of the PET, Commodore 64, Commodore 16, Commodore
128, and Amiga personal computers. Their logo is a chicken head.
On 29 April 1994, Commodore International announced that it had been unable to
renegotiate terms of outstanding loans and was closing down the business.
Commodore US was expected to go into liquidation. Commodore US, France, Spain,
and Belgium were liquidated for various reasons. The names Commodore and Amiga
were maintained after the liquidation.
On 1995-04-21 CBM was bought by Escom AG, a German company and production of the
Amiga resumed. Production of the 8-bit range alledgedly never stopped during the
time in liquidation because a Chinese company were producing the C64 in large
numbers for the local market there.
Commodore 64 « Commodore 64DX « Commodore 65 «
Commodore Business Machines » Commodore SX64 »
COMmon Algorithmic Language » Common Applications
<computer> A "portable" Commodore 64. Shaped vaguely like a seat cushion,
this cumbersome experiment in transportable computers had a detachable keyboard
on one end which, when removed, revealed a 6" monitor and a 5 1/4" floppy disk
drive. The curious combination of a bulky design and microscopic display are the
most likely cause for the SX64's discontinuation.
[Processor? RAM? Dates?]
Commodore 64DX « Commodore 65 « Commodore Business
Machines « Commodore SX64 » COMmon
Algorithmic Language » Common Applications
Environment » Common Applications Service Element