Autopsy:

This is my homebrew C2N232 Interface.

from Marko Mäkelä’s homepage:

The C2N232 is a small RS-232 interface that can be plugged to the cassette port of an 8-bit Commodore computer:

• PET series: 2001, 3000 series, 4000 series, 8000 series, 200 series
• PET-II series: CBM 500, 600 or 700 series (P500 or the B series)
• Commodore VC-20, VIC-20 or VIC-1001
• Commodore 64, 4064, 64c or 64G
• Commodore 128, 128D or 128DCR
• Commodore 264 series: 16, 116, plus/4 or 232

source: Marko Mäkelä’s Homepage

Autopsy:

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from Wikipedia:

The Commodore 8050 and Commodore 8250 were dual unit 5¼” floppy disk drives for Commodore International computers. They used a wide rectangular steel case form similar to that of the Commodore 4040, and used the IEEE-488  interface common to Commodore PET/CBM computers.

The 8050 was a single sided drive, whereas the 8250 could use both sides of a disk simultaneously. Both used a “quad” density format storing approximately 0.5 megabyte per side. The density of media was similar to later PC high density floppy disks, but the 8050 and 8250 could not use PC high density disks reliably. Since “quad” density disks were rare even at the time, users quickly found that typical double density floppy disks had enough magnetic media density to work in these drives.

These drives were not dual mode, so they could not read or write disks formatted by the more common lower capacity Commodore 1541 or Commodore 4040 models.

Some variants of these drives existed. The Commodore 8250LP was the 8250 in a lower profile, tan-colored case. The Commodore SFD-1001 was a single drive version of the 8250 in a Commodore 1541 style case (similarly to the Commodore 2031LP), often used by bulletin board systems for their physical similarity to 1541s and high capacity and speed.

source: wikipedia

Autopsy:

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from Wikipedia:

The Commodore PET (Personal Electronic Transactor) was a home/personal computer produced by Commodore starting in 1977.  It was a top seller in the Canadian, United States, and United Kingdom educational markets, and was Commodore’s first full-featured computer and would form the basis for their entire 8-bit  platform.

n the 1970s, Texas Instruments was the main supplier of CPUs for use in calculators. Many companies sold calculator designs based on their chip sets, including Commodore. However, in 1975 TI increased the price to the point where the chip set alone cost more than what TI sold their entire calculators for, and the industry they had built up was frozen out of the market.

Commodore responded by looking for a chip set of their own they could purchase outright, and quickly found MOS Technology, Inc. who were bringing their 6502 microprocessor design to market. Along with the company came Chuck Peddle’s KIM-1 design, a small computer kit based on the 6502. At Commodore, Peddle convinced Jack Tramiel that calculators were a dead-end. Instead they should focus on making a “real” machine out of the KIM-1, and selling that for much higher profits. Tramiel demanded that Peddle, and Tramiel’s son, Leonard, create a computer in time for the June 1977 Consumer Electronics Show, and gave them six months to do it.

The result was the first all-in-one home computer, the PET. The first model was the PET 2001, including either 4 KB (the 2001-4) or 8 KB (2001-8) of 8-bit RAM. It was essentially a single-board computer with discrete logic driving a small built-in monochrome monitor with 40×25 character graphics.

The machine also included a built-in Datassette for data storage located on the front of the case, which left little room for the keyboard. The data transfer rate to cassette was 1500 baud, duplicated for safety, giving an effective rate of 750 baud. The 2001 was announced at the ‘77 Winter CES in January 1977 and the first 100 units were shipped in mid October 1977.

However they remained back-ordered for months, and to ease deliveries they eventually cancelled the 4 kB version early the next year. Two more machines were released in the PET series. The CBM 8000  included a new display chip which drove an 80×25 character screen, but this resulted in a number of software incompatibilities with programs designed for the 40 column screen, and it appears to have been unpopular as a result.

The machine shipped with 32 kB standard as the 8032, but allowed another 64 kB to be added externally. Later the upgrade was installed from the factory, creating the 8096.

source: wikipedia petlibrary.tripod.com

• PIN 1 = Common (GND)
• PIN 4 = Free
• PIN 2 = 14.6v (AC)
• PIN 5 = Free
• PIN 3 = 14.6v (AC)

Click here for my Commodore Modem 8010.

autopsy:

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This is my first Modem, this is a Acoustic coupler modem for Commodore PET but i could use it with a IEEE488 Interface for the Commodore 64.

Description:

• Country: USA
• Most Common: Usa
• Rarity: Rare
• Year: 1979-1983

from Wikipedia:

Prior to the deregulation of telephony in many countries of the world, it was illegal to make an electrical connection to the telephone network.

Also, in many households, telephones were hard-wired to wall terminals before connectors like RJ11 and BS 6312 became standardised. With the increased use of computing, acoustic couplers were used to connect modems to the telephone network. Speeds were typically 300 bits per second, achieved by modulating a carrier at 300 baud. The first such device was the ACOUSTIC DATA COUPLER 300 MODEM from 1968.

The practical upper limit for acoustic-coupled modems was 1200-baud, first made available in 1985 with the Hayes Smartmodem 1200A.

source: wikipedia

Autopsy:

Description:

• Country: USA
• Most Common: Usa/Europe
• Rarity: Rare
• Year: 1977

from Wikipedia:

The Commodore 1530 (C2N) Datasette, was Commodore’s dedicated computer tape recorder.

It provided access to an inexpensive storage medium for Commodore’s 8-bit home/personal computers, notably the PET, VIC-20, and C64. A physically similar model Commodore 1531 was made for the Commodore 16 and Plus/4 series computers.

The Datasette contained built-in analog to digital converters and audio filters to convert the computer’s digital information into analog sound and vice versa (much like a modem does over a telephone line). Connection to the computer was done via a proprietary edge connector (Commodore 1530) or mini-DIN connector (Commodore 1531). The absence of recordable audio signals on this interface made the Datasette and its few clones the only cassette recorders usable with CBM’s machines, until aftermarket converters made the use of ordinary recorders possible.

source: wikipedia