Programming the KENBAK-uino

Here I (silently) program the Kenbakuino with a simple program which just adds 1 to the displayed number, in an infinite loop. It's too fast to really see, the LEDs are a blur, so I use one of my extensions to slow it down. Note that when entering the program, sometimes I choose to use the CLR button to reset the number to 000 before entering a new value, other times I modify what's already there.

The operations are

003 (enter 3 octal)

SET (sets the address to 3)

004

STOR (this sets the memory at the address (3) to 4 and increments the address. Location 3 is the program counter and it's now set to point at the next byte, the start of the program)

103 (this is the "ADD constant to register A" op-code)

STOR

CLR (set the entry to 000)

001 (this is the constant to add to A)

STOR

134 (this is the "STORE A at address" op-code)

STOR

CLR (set the entry to 000)

200 (this is the address to store A, 200 is the output register)

STOR

344 (this is the "JUMP unconditionally to address" op-code)

STOR

CLR (set the entry to 000)

004 (this is the address to jump back to -- the start of the program)

STOR

 

STRT (the program runs, but too fast to see)

STOP (stop the program)

BIT-4+STOP (slows the CPU down)

STRT (the incrementing is visible now)

 

 

Done