Example:

START: TIA F ; put F into A register
 AO           ; display value of A register
 CAL SHTS     ; play short beep (can omit "CAL")
 JUMP START   ; restart if flag set
 JUMP #02     ; go to third nibble in code (flag was set by first JUMP)

Quick Reference:

All opcodes set flag except in the circumstances mentioned.

Source here.

• KA (0): hex key→Ar and flag clear if hex key pressed
• AO (1): display Ar on 7-seg LED
• CH (2): Ar↔Br, Y↔Z
• CY (3): Ar↔Yr
• AM (4): Ar→[50+Yr]
• MA (5): [50+Yr]→Ar
• M+ (6): [50+Yr]+A→Ar; flag clear if no overflow
• M- (7): [50+Yr]-A→Ar; flag clear if no underflow
• TIA x (8x): x→Ar (immediate x)
• AIA x (9x): Ar+x→Ar (immediate x); flag clear if no overflow
• TIY x (Ax): x→Y (immediate x)
• AIY x (Bx): Ar+x→Yr (immediate x); flag clear if no overflow
• CIA x (Cx): flag clear if x=Ar (immediate x)
• CIY x (Dx): flag clear if x=Yr (immediate x)
• JUMP xy (Fxy): jump to xy if flag set
• CAL RSTO (E0): clear 7-seg LED
• CAL SETR (E1): turn on LED #Yr
• CAL RSTR (E2): turn off LED #Yr
• CAL CMPL (E4): bitwise complement Ar
• CAL CHNG (E5): Ar/Br/Yr/Zr↔A'r/B'r/Y'r/Z'r
• CAL SIFT (E6): right shift Ar; flag clear if Ar was odd (!)
• CAL ENDS (E7): end sound
• CAL ERRS (E8): error sound
• CAL SHTS (E9): short sound
• CAL LONS (EA): long sound
• CAL SUND (EB): play note in Ar (from 1 to E)
• CAL TIMR (EC): delay (Ar+1)*0.1 sec.
• CAL DSPR (ED): display [5F][5E] on the LEDs
• CAL DEM- (EE): decimal subtraction
• CAL DEM+ (EF): decimal addition