Replacing existing pic

[Freman]

I'm positive there's no missed resistors or diodes in relation to the push buttons - as much as it's a very abbreviated schematic, the circuit really doesn't have much more - I can upload some scans of the board if you like, but I've actually decided to approach this a different way.

Originally I was going to sacrafice the remote control function to gain a serial interface, but what I've since decided to do is take the two outputs from the original pic and feed it into another pic - this will give me my serial interface and keep the remote control - without having to deal

Now I have a problem with frightfully slow interrupts - I've tested this in PIC Simulator and it works reasonably quickly there. In real life tho, this code interrupts 'eventually' usually 5-20 seconds later. I can't see why, I'm only tying it up for 10 ms then I've inserted an extra pauseus so it's got something to interrupt before/after before returning to serin.

Anyway I can speed up the interrupt to... between 11 and 100 ms?

' Configure the pic
@     device pic12F675, INTRC_OSC_NOCLKOUT, WDT_ON, PWRT_ON, MCLR_OFF, BOD_ON, CPD_OFF, PROTECT_OFF

N9600   CON     6

CMCON        = 7
ANSEL        = 0

Relay1       VAR GPIO.5
Relay2       VAR GPIO.4

SlavePower   VAR GPIO.2
SlaveRelay1  VAR GPIO.0
SlaveRelay2  VAR GPIO.1

Serial       VAR GPIO.3

B0           var BYTE

INPUT SlaveRelay1
INPUT SlaveRelay2
INPUT Serial

OUTPUT Relay1
OUTPUT Relay2
OUTPUT SlavePower

ON INTERRUPT GOTO slaveSpeaks
IOC            = %00000011
INTCON       = %10001000

' Turn on the original PIC
HIGH SlavePower

main:
    B0 = 0
    PAUSEUS 1

    SERIN Serial, N9600, 10, main, [1], B0

    ' The original PIC latches it's output, we want to reboot the original pic if we get something from the serial port to force it's outputs low
    IF B0 > 1 THEN LOW SlavePower
    if B0 = 2 THEN GOSUB subUp
    IF B0 = 3 THEN GOSUB subDown
    IF B0 = 4 THEN GOSUB subStop
    IF B0 > 1 THEN
        PAUSEUS 1000
        HIGH SlavePower
    ENDIF
GOTO main

DISABLE
subUp:
    LOW Relay2
    HIGH Relay1
    RETURN
subDown:
    LOW RELAY1
    HIGH Relay2
    RETURN
subStop:
    LOW Relay1
    LOW Relay2
    RETURN

slaveSpeaks:
    if SlaveRelay1 THEN
        GOSUB subUp
    ELSE
        IF SlaveRelay2 THEN
            GOSUB subDown
        ELSE
            GOSUB subStop
        ENDIF
    ENDIF
    INTCON = %10001000
    RESUME
ENABLE