Search Posts:

The CGRS Front Panel System


Return to Threads

  The CGRS Front Panel System by Bill Degnan - 11/24/2007 00:06
CGRS Microtech introduced their front panel 6502 single board computer interface in 1977.

I have not found any articles or ads for this product yet.

"..The CGRS FRONT PANEL is a direct memory access (DMS) type microcomputer control panel. It is totally hardware based microcomputer control that independently supplies static logic levels to perform various control functions and does not depend on microcomputer operation.

MEMORY READ AND WRITE: The CGRS FRONT PANEL can read or write into any memory location by halting the microprocessor and directly generating the address bus and control bus signals. The address bus signals and the data information from the memory are displayed on seven-segment hexadecimal displays. Information to be loaded into memory is entered on the eight data switches in binary form and loaded into memory when a load operation is executed.

SINGLE CYCLE PROGRAM EXECUTION: The CGRS FRONT PANEL can control the microprocessor to allow it to execute its program a single cycle at a time. This allows the user to watch program flow in detail and immediately recognize incorrect operation. The program can be stopped at any time to read or load memory.

FULL SPEED OPERATION The CGRS FRONT PANEL allows the microprocessor to execute its program at full speed. The program can be stopped at any time for single cycle operation or memory operations.

SYSTEM RESET: The CGRS FRONT PANEL includes a system reset that is used to restart program execution.


  CGRS system by Jack Rubin - 02/23/2008 20:54
I have one of these systems along with docs. Anything specific you want to know? Someday, it will be a VCF project, but not Too Soon Now.




Buy a Commodore Computer Poster

Popular Topics and FAQs

  • Commodore B Series Tips and Tricks
  • Aerocomp TRS 80 M 1 Expansion Unit DDC
  • Items Wanted
  • Lobo Max 80
  • Zenith Z-19-CN
  • Prototype PET 2001 photo
  • Using Toggle Switches to Analyze Memory
  • Commodore Disk Archive Project
  • PET 2001 Prototype at Gametronics 1977
  • Jim Butterfield Photo
  • IMSAI 8080 With Processor Tech. Cutter
  • Secrecy is the keystone of all tyranny
  • Cromemco System Three
  • Northstar Horizon - Boot Problem
  • Computer History and Restoration Links
  • Commodore BX-256-80 - 8088 Co-processor
  • S-100 board testing with Z-80 ICE
  • Donner 3500 - an early portable computer
  • Digital (DEC) PDP 11/05 NC Assembly
  • Univac 1219 rescue
  • Fido BBS listing node list 6-13-1986
  • PDP 8e
  • MITS 88-2 SIO (2SIO) for BASIC
  • Visual Technology Inc Model 1050
  • Amiga 2500 Restoration
  • The Evolution Of IBM Computers
  • Replacement teletype print hammer head
  • Archiving and Copying Software 101
  • Computers Built 1940 - 1950
  • CBM B-520 (a.k.a B256-80 or B500 256)
  • RCA COSMAC Microkit
  • Commodore 64K C-116 Mods
  • MITS 8800b Turnmon 9600 baud
  • Catweasel, 8in and 5 1/4
  • Raspberry Pi as Gateway to Internet
  • Digital PDP11 late 1969 early 1970
  • PDP 11/40 72 inch cabinet model
  • PDP 11/40 Industrial 11 model
  • Digitial MicroVAX 3100 30 System
  • Digital VAX 4000-200
  • Commodore 64 / 1541 DRIVEKNOCK
  • Booting the System Using RL02 drive
  • PACS: Reflections by Kathleen Mauchly
  • Tele-Graphic Computer Systems Inc.
  • Commodore B Series SID Jukebox?
  • Installing Core into PDP 11/40
  • Setting Up OpenVMS 7.1 DNS CLERK
  • Felt-Tarrant Comptometer Model J
  • NextStation Color
  • Digital Rainbow (PC100-B2)
  • 1970 Compusad Compulogical Tutor
  • Archiving Papertapes Using DSI NC 2400
  • 1976 P.C.C. Features the MAI JOLT 6502
  • 1961 Beckman DEXTIR Computer
  • UNIVAC 1 and UNIVAC File Computer 1
  • Past Issues:

    PDP8rew top left cardview3

    This image was selected at random from the archive. Click image for more photos and files from this set.