OT: Any assembler peeps out there?

[guddler]

[ukvac] OT: Any assembler peeps out there?
Very OT i know, BUT can anyone tell me what the hex is for the two-byte
command JMP (unconditional) - if there is a two byte command version!

x86 Z80 assembler....

Thanks,
Guddler.

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[John Bennett]

Re: [ukvac] OT: Any assembler peeps out there?
On Thu, Jul 05, 2001 at 11:48:10AM +0100, Guddler wrote:
> Very OT i know, BUT can anyone tell me what the hex is for the two-byte
> command JMP (unconditional) - if there is a two byte command version!
>
> x86 Z80 assembler....

x86 and Z80 don't use the same opcodes, you know ...

Assuming you mean JP, then the unconditional version on the Z80 is 0xC3
followed by two bytes for the absolute address to jump to. Those bytes
are in little-endian order.

If you mean JR for a relative jump, then you want 0x18 followed by the one
byte signed offset to jump to.

<plug>
There's an (almost) complete Z80 instruction set listing on my website,
http://www.cantrell.org.uk/david/tech/cpc/cpc-firmware/z80index.pl
</plug>

--
David Cantrell | david@cantrell.org.uk | http://www.cantrell.org.uk/david

If a job's worth doing, it's worth dieing for



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DATA Imported from archives: originally posted by David Cantrell (david@cantrell.org.uk)

 

[dz1n3]

Re: [ukvac] OT: Any assembler peeps out there?
theres several but....

JP nn (PC <- nn)

"11000011 xxxxxxxx xxxxxxxx"
"C3 xx xx"