Steve,
Thanks for the reply, but I'm not sure where these colons would go. ISR1 and ISR2 are actually each about thirty lines of code, what I wrote was just a summary. For example, ISR1 looks like this:


ORG 0003H
INC R0; ADD GOOD HIT TO COUNT
MOV A, R0
MOV B, #10
DIV AB
MOV DPTR, #400H
MOVC A, @A+DPTR
MOV TMOD, #20H; SET TIMER MODE
MOV TH1, #-3; SET TRANSFER RATE
MOV SCON, #50H; SET TRANSFER TYPE
SETB TR1; START TIMER
MOV SBUF, A; MOV QUOTIENT
DONE1: JNB TI, DONE1
CLR TI
MOV TMOD, #20H; SET TIMER MODE
MOV TH1, #-3; SET TRANSFER RATE
MOV SCON, #50H; SET TRANSFER TYPE
SETB TR1; START TIMER
MOV SBUF, B; MOV REMAINDER
DONE2: JNB TI, DONE2
CLR TI
RET1


Where would the colon go in this case?