There are a couple of things to watch out for when doing the
conversion.

The reset vector on the C(F) 84 = 000h. The C54 = 1FFh
The OPTION register has extra bits assigned. (6 and 7)
The STATUS register page select bits refer to RAM on the 84 and
on the C54 refer to ROM These are now assigned PCLATH, but are unused
on the 84
The FSR register is 8 bits wide in the 84 and on 5 wide in the
C54.
PortA has an extra bit (RA4)
PortB has pullups
RAM location 7h is unimplemented in the 84
The TRIS and OPTION instructions should be changed as per Microchips
mention of avoiding their use. These registers are addressable in the
84
There are extra instructions available in the 84.
Return, Retfie, Addlw, Sublw
ROM address 0004h is an Interrupt vector.
RTCC changed to TMR0 and shared with RA4.


Tony


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