Two statements from assembly - trying to convert the code in PBasic Pro

[Mike, K8LH]

The PBP instruction you're looking for might be "goto INTHAND", but, I wonder if there's really any need to jump to another program area for interrupt handler code?

[Megahertz]

Hello Mike, Yes you do need to go to another location of memory when interrupts get involved.
I read the datasheet of the 16f676 and it does say the whole memory is only one page, so I don't know why PCLATH needs touching, I also checked the ISR routine example in the datasheet and it does not mentions anything about the PCLATH. Only saves WREG & STATUS.

[Mike, K8LH]

Hi Megahertz,

Was the original assembly language program written for a 16F676? Also, what is the source for the original assembly language program, please?

Cheerful regards, Mike

[Megahertz]

This was written for 16F676 only originally. The source I don't know but I got it from my friend at UNI, we both are trying to understand the context saving part of it.