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Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01YDRjtmAiNpo5mK5N3d7QwZ

content/museum/gespac-gescomp-720-730.md

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+---
+title: Gespac Gescomp 720 / 730
+categories:
+- Computers
+types:
+- Professional Computer
+origins:
+- Swiss
+years:
+- '1982'
+cpus:
+- '6800'
+params:
+  name: Gescomp 720 / 730
+  image: /media/museum/photos/gespac_gescomp-720-730_1s.jpg
+  company: /companies/gespac
+  company_name: Gespac
+  specs:
+  - label: NAME
+    value: Gescomp 720 / 730
+  - label: MANUFACTURER
+    value: Gespac
+  - label: TYPE
+    value: Professional Computer
+  - label: ORIGIN
+    value: Swiss
+  - label: YEAR
+    value: ? 1982
+  - label: KEYBOARD
+    value: Full stroke keyboard with numeric keypad and function keys
+  - label: CPU
+    value: 6800 / 6809 / Z80
+  - label: RAM
+    value: 64 KB
+  - label: GRAPHIC MODES
+    value: 256x192
+  - label: COLORS
+    value: 'yes'
+  - label: SOUND
+    value: unknown
+  - label: BUILT IN MEDIA
+    value: 2 x 5.25'' disk drives (400 KB or 800 KB each) + optional 5 MB Winchester hard disk
+  - label: OS
+    value: GESDOS (6800-6809), CP/M 2.2, GESBOS (Z80)
+  - label: POWER SUPPLY
+    value: Built-in PSU
+  tabs:
+  - photos
+  - adverts
+  photos:
+  - title: GESCOMP 720-730
+    subtitle: ''
+    text: ''
+    image: null
+  - title: GESCOMP
+    subtitle: ''
+    text: |-
+      Model not really known, but this is one is based on a 6809 CPU.
+
+      Thanks to F1FCO for this picture
+    image: null
+  adverts:
+  - title: FRENCH ADVERT (JUNE 1982)
+    subtitle: ''
+    text: ''
+    image: null
+  oc_id: 1340
+  source:
+    url: https://web.archive.org/web/20230609210709/http://www.old-computers.com/museum/computer.asp?c=1340
+    date: '2023-06-09'
+---
+
+GESPAC SA was a Swiss company who designed the G-64/96 Bus in 1979. This interface bus concept provides a simple way to interface microprocessor modules with memory and peripheral modules on a parallel bus. The G-64/96 Bus uses a simple, yet modern and powerful interface scheme which allows a higher level of functionality from the single height Eurocard form factor. The low overhead of the G-64/96 Bus interface greatly eases the design of custom boards by the User. This is why, even many years after its invention, the G-64/96 Bus is still widely used in the industry.
+
+The G-64/96 bus concept supports the following features:
+
+\- Processors manufacturer independent interface - 8 and 16-bit data transfers - Up to 32 Mbyte addressing capability - Multiple DMA operations - Non-vectored and vectored interrupts - A parallel decentralized arbitration scheme (G-96: multi-processors) - A message passing mechanism (G-96: multi-processors)
+
+In 1982, GESPAC SA released two computers based on the G64 Bus: Gescomp 720 and Gescomp 730, mainly targeted as industrial use.
+
+These modular systems could use a wide variety of G64 compatible boards. They could be powered by a 68000/6809 CPU, or a ZX80 CPU or a 8085 CPU !
+
+Depending on the CPU installed, the computer could run different operating systems:
+
+\- 68800-6809 -> GESDOS, offering an editor, macro-assembler, Basic, Graphical Basic, 6809 emulator, IEEE 4888, Centronics printer interface\
+\- Z80-8085 -> CP/M 2.2, mainly used for wordprocessing and CP/M tools\
+\- Z80 -> GESBOS, offering a GESBOL interpreter, GESBOL compilator + many professional applications.
+
+Each computer had 64 KB RAM and came in different mass storage configurations:\
+\- two 5.25'' floppy disk drives (400 KB each)\
+\- two 5.25'' floppy disk drives (800 KB each)\
+\- one 5.25'' floppy disk drive + 5 MB Winchester hard disk
+
+Apparently the computer had a colour graphic card offering 512x256 pixels resolution.
+
+In 1982, GESPAC NETWORK was available. It was a communication network solution for Gespac Bus based systems. Up to 32 computers could be connected, to a maximum distance of 300m and with a transmission speed rate of 800 KB/s.
+
+<table> <tr> <td></td> <td>We need more info about this computer ! If you designed, used, or have more info about this system, please send us pictures or anything you might find useful.</td> <td></td> </tr> </table>