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Heathkit ET-3400 Microcomputer Learning System Motorola 6800 Microprocessor Evaluation Board from the Late 70’s Simple Assembly Program Demonstration
The ET-3400 is an educational trainer from 1977. It is based on the Motorola MC6800 CPU. It came with a whopping 256 bytes of RAM (expandable to 512 bytes) and a 1K on-board ROM monitor program. The Trainer was sold by the Heath Company (Benton Harbor, Michigan) as a kit ($190), or factory assembled ($240).
Heathkit ET-
Input: Hex Keypad; Output six 7-segment displays
RAM $0000-$01FF (512 bytes)
The following describes the loading and execution of a simple assembly program that loads ACCA with $01 and ACCB with $0F, adds the two numbers in ACCA and saves the result ($01) at $00FF.
Assembly program: LDAA #$ LDAB #$0F ABA STAA $FF SWI
Machine code (in Hex) 86, 01, C6, 0F, 1B, 97, FF, 3F
Loading the program into Trainer memory RESET, AUTO, 0000, 86, 01, C6, 0F, 1B, 97, FF, 3F
Executing the program RESET, DO, 0000
Reading result EXAM, 00FF
Watch Video: http://youtu.be/Di3HnM-Q3f
