Here is a description of the desktop version, called C128-D. The computer was also available as a keyboard computer named C128. In the desktop version, the power supply, the C128 PCB board and the floppy drive 1571 are mounted in one case. The keyboard was externally connected and can be placed flexible. There are two versions (C128-D with plastic case and C128-D CR in metal case). The 1570/1571 was specially developed for use with C128 computers.
The C128-D in the first version used a plastic case. It used the same motherboard as the keyboard computer C128 and has a built-in floppy 1571 mechanics in one case. The floppy PCB board was specially developed for the C128-D. Even the power supply is installed, which has a fan. The keyboard is external. Practical: On this version you can mount the keyboard to the bottom and it also has a carrying handle for easy transport.
Later there was a version with a metal case. The C128 board and 1571 board were combined into one board, which helped save the cost. In this model, therefore, three processors are accommodated on a printed circuit board (C64/C128: 8502, CP/M: Z80 and Floppy: 6502). Thus, this version is called C128D-CR (CR stands for reduced cost). With a few modifications, this version was a bit incompatible, but had more video memory for the C128-chip VDC. Sadly the carrying handle and possibility to mount the keyboard onto the bottom disappeared. This version comes without a fan.
The plastic model has the power switch in it's left side. Behind that is a carrying handle so you can easily transport the computer! The metal model has the power switch on ot's back left. The carrying handle and the keyboard holder disappeared.
On the right side bowth modes have connections for the external keyboard, two joysticks and two reset buttons for the floppy and the computer itself. The C128-D CR has the Datasette port on this side too. Notice the space for the keyboard on the plastic model. At the metal model are the connections (and the entire board) further below, because the space was not lost for the keyboard holder.
The back has the same connections as the computer keyboard computer version of the C128. From right to left: Power switch (only metal model), power connector (the power supply is installed), user port, RGBI output (80-character mode), TV modulator, video port, serial port, port for Datasette (only C128-D plastic) and expansion port. On the plastic model you can mount some cables. The C128-D in the metal version has the nameplate on the rear.
The bottom of the C128D. Left is the simple metal version. Right is the plastic version. Practically, that you can mount the external keyboard here. Together with the handle that is a very innovative and simple solution to transport the computer. The nameplate is on the underside of the computer at the metal version of it is attached to the back.
Here the two versions compared. The C128-D in the metal version (below). Thanks to the revision and the elimination of the keyboard support, this model is flatter than the plastic version (above)
The C128-D compared with the (almost) simultaneously published Amiga 1000. The models look very similar. While the C128-D is in the plastic version can mount the keyboard only in transit, it is possible to store the keyboard under the computer after work with the Amiga 1000. But a secure transport is not possible. There was also a prototype of the C128-D with built-in 3 1/2" drive, which looks very similar to the Amiga 1000.
The inside of the C128-D (plastic version): Installed the board of the normal, flat C128 keyboard computer. Also the shielding metal is the same. On the front sits the power supply, including the fan. Right behind the drive mechanics sits the board of the 1571. Due to the many boards, cables and shielding the computer is very difficult to open.
The C128-D plastic version uses the same board as the C128 computer. Only difference is the keyboard connector on bottom right corner, the additional floppy reset button and the cable connector to the 1571-board on the top. The board is quite large, has many traces in the middle. In the metal box there is the video chip of the C64, the VIC-II and the C128, called VDC. The SID is right next to the metal box. On the board you can also find the MOS 8502 processor and a Zilog Z80 (for the CP/M mode). Top left is a free socket for optional extensions. On the bottom left corner there are total of 16 chips for 128 KB RAM.
Here is the inside of the C128 D-CR (metal version): Here was a new, revised motherboard installed. It contains all the elements of the C128 and 1571 board. The board of the computer is more accessible and contains three processors (Z80, 8510 and 6502). Thanks to the metal case a shielding is no longer necessary. The built-in switching power supply requires no fan. The drive mechanism is seated front right. With only four screws, the computer can be opened easily and quickly.
The C128 has the best BASIC, which was used in Commodore home computers. Version 7.0 has many improvements and is greatly expanded. Shown on the right is the green startup screen of the 40 character mode.
The 80-character mode requires a special RGB cable and is generated by the VDC chip. The writing is light blue on a dark background.
In 80 characters mode it is possible to start CP/M. This is loaded from disk. When you turn on the computer and a disk is inserted in the floppy drive, it will be automatically started. The font is pink on a black background.
BASIC 2.0 is used in C64 mode. It will be started if you hold down C= key at power up or if you enter the command "GO 64" in BASIC 7.0. Most of the C128 were used for c64 mode only bbecause there was not much special software for the C128 and CP/M was already outdated.
3D ModelI don't created these 3D models. I have edited and maybe converted the models only. They are downloadable for free from:
|Launch price:||500 Dollar|
|Processor:||MOS 8502 (2 MHz) and Z80A (4 MHz)|
|Operating system:||BASIC 2.0 und 7.0 sowie CP/M|
|graphics chip:||6569 (VIC-II) and 8563 (VDC)|
|Resolution:||Up to 640x200|
|Soundchip:||MOS 6581/8580 (SID)|
|Sound:||3 voices, mono|
|Size:||430 x 360 x 110 mm|
RGBI (80 characters)
|expansions inside:||Chip socket for programs / enhancements|
The above shown computers are in the collection!
Compatible drives for the computer C128: