The benefit of the 4064 on the internal monitor without the ability to display color gradations was severely restricted. The device was not a success and only rarely and mostly sold at schools. Only a few of them ever came into private possession, which makes it extremely rare for collectors. Technically, the 4064 is similar to the portable SX-64 and the normal C64 models. There was also a keyboardless game console called C64 Games System, as well as the computer-based Max Machine, which was based on C64 technology, but was only sold in Japan.
The 4064 is inspired by the appearance of the PET and CBM computers, but the keyboard from the C64 was used. In contrast to older PET models, the housing is largely made of plastic, only the lower part is still made of metal. The green monitor has a picture diagonal of 12 "and was also used for later CBM computers.
Since the C64 can display 16 colors, but the 4064 has only a green monitor, the colors printed on the keyboard (normally on front of the number keys) were removed. On the external monitor the display is shown in gray scale. Also noticeable is the additional, black sticker, which includes, among other things, the BASIC commands and adresses.
Most connectors are not very handy on the right side of the device but identical to those of the C64: the expansion port for cartridges, the video connector for external monitors (but only five pin instead of eight, as the first C64 board was used), the serial port for floppy disk drives and printers, a connection option for a datasette and the user port were available. At the front are the two joystick sockets. However, neither a mouse nor paddles can be operated with this because the SID, which evaluates the analog signals, is missing.
On the rear of the 4064 are the nameplate, power supply, fuse and on / off switch.
Inside the 4064, as in the case of the PET computers, the power supply is located to the left. The C64 board was installed to the right, explaining the location of the connectors on the right side. In contrast to the C64, the keyboard cable is significantly longer. Since the TV modulator is missing and the C64 needs to produce its video signal, a replacement circuit was implemented on a small board, to which the PET monitor is also connected.
A difference to the C64 is the kernal ROM, which has been adapted so that no more colors can be used. The power-on message has also been changed so that the computer starts up with the message COMMODORE 4064 BASIC V2.0. Note also the early production date of the chips, which lies between late 1982 and early 1983. Even if the ceramic ICs are very popular among collectors, the Kernal ROM of the 4064 with the designation 901246-01 (the C64 usually has the 901227 component here) was also produced with a plastic IC housing.
In addition to the modified kernal ROM and the missing TV modulator, the following changes have also been made: The SID chip (responsible for sound and paddle input) is missing completely so that the 4064 cannot generate any sound. Also the color RAM was removed, so no colors can be displayed.
Commodore used a revised version of the kernal ROM of the C64 in 4064. Since the 4064 cannot display colors, this was prevented. The power-on message has also been adjusted. On the right is the representation, as it is output at the external monitor connection. The display is green on the internal monitor.
Software test of the 4064 computer: "Le Mans", "BluREU"-Demo, " Micro Hexagon" and "C64anabalt".
The 4064 was also sold under the name PET 64.
Legends out of the Internet
On many websites, the 4064 or PET 64 is incorrectly referred to as "Teachers' PET". But the "Teachers' PET" was a PET / CBM computer (not a C64) with changed logo at its front. It was produced by Commodore for the "buy-2-take-3" offer and was given away at schools that took part in it. Especially in Canada, Commodore was successful in the education sector and partially controlled up to 67% of this market.
The big brother
The "Educator 64" is very similar in concept (a C64 in a PET / CBM housing), but is technically improved. It used a later version of the C64 board and offered the following features that the 4064 lacked: SID sound chip, TV modulator, internal green monitor with gradations, internal loudspeaker as well as a headphone output with volume control. The notes above the keyboard have been modified. On the nameplate on the backside, the Educator 64 is referred to as Model 4064 despite the modifications.
|Processor:||MOS 6510 (1,02 MHz)|
|Operating system:||BASIC 2.0|
|graphics chip:||MOS 6566/6567/6569 (VIC-II)|
|Resolution:||Up to 320 x 200|
|Size:||C64: 205 x 405 x 70 mm
C64c: 250 x 410 x 70 mm
The above shown computers are in the collection!
Compatible drives for the computer 4064: