Date   : Sun, 09 Jun 2013 13:22:57 +0100
From   : jgh@... (J.G.Harston)
Subject: 16-bit x86 assembler

I'm recreating the source for the 80x86 CoPro client ROM[1]. I was 
using the 80x86 assembler in BBC BASIC for Windows, but as it's a 32-bit 
assembler it emits 32-bit opcodes to run in a 32-bit environment, for 
instance:

    mov bx,&0033 gives 66 BB 33 00

instead of what I require:

    mov bx,&0033 gives BB 33 00

changing register names to ebx, etc., gives the correct opcodes for 
register-to-register operations, but the above then gives the 32-bit 
sequence:

    mov bx,&0033 gives BB 33 00 00 00

The source is too big to load into DOS BBC BASIC which has a 16-bit 
assembler. Are there any 16-bit x86 assemblers that people could 
recommend, either to run on RISC OS or DOS/Windows? Ta.

[1]http://mdfs.net/Software/Tube/80186/v100.src

-- 
J.G.Harston - jgh@...      - mdfs.net