BCL Molecular BCL Molecular BCL Molecular

| Model | Released | Usage_ | Features | Storage_ |
|---|---|---|---|---|
| Mark 4 |  | SOP, Livestock Markets, Paper merchants, Plumbers merchants. | Developed after the demise of BCL by ABS computers. Basically a 6ME in a new cabinet with lead acid battery backed static RAM instead of ferrite core. , Programming still done in octal notation machine code in longhand using coding sheets. | Core Memory or static RAM, Introduced the CDC Hawk 9427H disk drive, up to 4 supported per controller, max 2 controllers and/or a large multi-platter CDC D8000 removable disk drive. |
| Mark 5 | 1984 | SOP, Livestock Markets, Paper merchants, Plumbers merchants. | Basically a re engineering of the 6ME processor to remove redundant stack logic and reduced to 3 boards with a printed circuit backplane instead of the costly wire wrapped backplane used for earlier models. , Hardware re-design by Systemation Developments K. A. Howlett (Keith Alec b1943 son of W A Howlett)with assistance in the final test stages by G. Boote. Cabinet design by Business Computers Systems Ltd. Hardware designed and manufactured by Systemation Developments for Business computers Systems. | Initially large-format Ampex ferrite core memory then static RAM, both introduced by Systemation Developments. , Later Bank switching memory introduced (32K 18 bit words base memory plus up to 8 X 32K banks). , First sold with CDC Hawk 9427H drives later CDC Lark 2 disk drives. Memory and new RS232 4 port I/O card (Quad I/O) by K. A. Howlett, Lark 2 disc controller by J. Adams. Up to four CDC Lark or Amcodyne drives per controller, max 2 controllers. |