ZD-Bug 1.0 commands (ON+PRGM to popup):
F1 ----- Convert hex byte to decimal and ASCII
F2 ----- Change ROM page (with up, down)
F3 ----- Edit (move bar under byte with arrows, <enter>, new value, <enter>)
F4 ----- Goto address
F5 ----- Find (type in starting address, ending address, and then item to look
         for, <enter>)
EXIT --- Exit popup
MORE --- Display the values of registers when popup opened
         ON+LEFT - Execute until an interrupt is called (pseudo-STEP function,
                   must be used in MORE screen)
LEFT --- Reduce contrast
RIGHT -- Increase contrast
UP ----- Scroll up 1 line
DOWN --- Scroll down 1 line
GRAPH -- View program's display
ON+GRAPH - Copy program's display to Graph Memory (screen capture)
ON+CUSTM - Crash to ZShell (use ONLY from TI-OS or when calc locks)
ON+CLEAR - Unload and exit from ZD-Bug
COMMA -- Change program delay (with up, down, but this can be wierd)
LOG ---- View Graph Memory
DIVIDE - Scroll up 1000h
TIMES -- Scroll down 1000h
MINUS -- Scroll up 1 screen
PLUS --- Scroll down 1 screen