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CBM B128-80 Serial Bus

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  CBM B128-80 Serial Bus by Bill Degnan - 04/15/2013 10:19
CBM B128-80 with Fast Bus cartridge
CBM B128-80 with Fast Bus installed to allow a person to switch from a serial-type disk driveand an IEEE drive. In this case I am switching between a CBM 8050 IEEE-type drive, and a VIC 1541 serial drive (on top of the monitor). Click for larger view.


A closeup of the two required components of a Commodore B Series "Fast Bus" system. On top of the B-128 is the Serial Bus Interface converter box. This is the device that switches betweem serial and IEEE drives. A RAM expansion cartridge is installed into the B128, in this case a new 24K RAM cart in bank 15 ($2000-7FFF) and handles the serial bus RAM space. The original carts covered $2000-2FFF (not pictured). The Fast Bus program is loaded from diskette on the 8050. (CBUG 84). Click for larger view.


B-128 Serial Bus Interface
Closeup of the B-128 Serial Bus Interface, which allows a person to toggle between a serial drive and an IEEE drive, or reset the serial port. Click for larger view.


More on this soon.

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  B128 Serial Bus Photo by Bill Degnan - 04/17/2013 16:29
CBM B128-80 Fast Bus cartridge pcb
Photo of the PCB of the B128 Serial Bus. Click for larger view.


More photos

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  Fast Bus Update by Bill Degnan - 08/12/2013 14:32
Put up set up instructions that came in the box here

Power up test: Perform the following instruction: PRINTPEEK(56321) The number returned should be 59.

CBUG disk #84 appears to have all Fast Bus-centric programs on it.

CBUG articles

Tells you more how the 24K cart plus Fast Bus, and software works.

One thing I learned is that you can actually copy from serial drives to IEEE drives. The system assigns the IEEE devices as 4-23, Serial devices 24-30.

IEEE printer 4-7
IEEE drives 8-23
Serial printer 24-27
Serial drive 28-30



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