
Practical aids
to programming 145
vidual words in the simulator, but others will require the entire program
to be rewritten.
Eventually, the system is found to behave correctly under all condi-
tions.
At this point, a new PROM chip is plugged in to the PROM
programmer interface, and an exact copy of the contents of the ROM
simulator store is automatically burned into it. Finally, the simulator is
removed from the system and the PROM chip fitted in its place. The
system is now complete.
Unfortunately this method only works for small programs because
it is almost impossible to translate large programs by hand correctly.
More complex systems nee ...