> -----Original Message-----
> From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf
> Of John Coppens
> Sent: Friday, August 22, 2014 12:30 PM
> To: piclist@mit.edu
> Subject: Re: [EE] Z80 dis-assembly assembly - preferred tools
>=20
> On Sat, 16 Aug 2014 21:49:20 +0700
> Justin Richards <justin.richards@gmail.com> wrote:
>=20
> > Now lastly the re-assembled file is 2 bytes larger than the original
> > 4096 as compared with 4098.  It needs to fit into a 4K EPROM.
>=20
> It's been many a year since I programmed Z80, but I seem to remember
> there are 2 and 3 byte jumps. If the destination address is after the
jump, the
> assmebler doesn't have any option but to use the 3-byte address as it
> doesn't know yet how far to jump. Unless you promise in the source code
> that the jump will be 'near'
>=20
> John

Z80 assemblers are aware of this issue and generally have two different
opcodes:

JP	Z,xxxx	- 3 byte absolute jump
JR	Z,xxxx   - 2 byte relative jump

~ Bob Ammerman
RAm Systems


--=20
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