Last Updated August 17/00
6502 Single Board Computer Alarm System Photos.
6502 Single Board Computer
The 6502 S.B.C. was constructed on a Vector wirewrap card with a 22 pin edge connector.
Back View of Alarm System
The 6502 S.B.C. and an optoisolator board were mounted inside a small panel.
The optoisolator board was used to interface alarm switches to the SBC.
Front View of Alarm System
The front of the panel has a Control switch to select the mode of operation, an Alarm
LED and Power LED indicator, and Reset and Test push buttons.
Opto Isolator Board
This is the optoisolator board which is used to interface alarm switches
to the 6502 S.B.C. It also has an Alarm relay on it, and Watchdog Pulse outputs.
Back View with Cards Removed
Both the 6502 and optoisolator board have 22 pin edge connectors. This made for easy removal
of the cards to install the firmware Eprom.
Terminal Strips for Alarm Switch Inputs
Barrier terminal strips at the
top of the panel are used to connect the alarm switches and alarm horn. The unit is powered
with 5 Vdc and 12 Vdc. The 5 Vdc is for the 6502 S.B.C. and the 12 Vdc is for the Alarm switches.