Front view:
Rear view:
Bottom view, feet;
Two screws were hidden under the round calibration labels.
Bottom view, two rear screws hidden under the feet:
Side view, pull the sticky bits off:
Complete top board:
Ooh look, a 68B09E. The 63B40 is a programmable timer module serial I/O and the two 63B21 provide parallel I/O.
I don't know what the 80C51 microcontroller does. Maybe helps manage the front panel?
The oscillator is 16 MHz.
ROM (8k), RAM (8k HN27C64) and the IEEE interface:
The intel P8291A is the IEEE488 talker/listener interface, the DS75160AN and DS75161AN are the buffers in standard 0.3" wide DIP (unlike the Texas Instruments buffers).
I don't know what the logic chips below the CPU do.
The battery is a very healthy 3.45 volts.
Underneath is the analogue board. The two metal cans shield the RF stuff.
Close-up views
Discussions
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