Subversion Repositories s80186

; Copyright Jamie Iles, 2017

;

; This file is part of s80x86.

;

; s80x86 is free software: you can redistribute it and/or modify

; it under the terms of the GNU General Public License as published by

; the Free Software Foundation, either version 3 of the License, or

; (at your option) any later version.

;

; s80x86 is distributed in the hope that it will be useful,

; but WITHOUT ANY WARRANTY; without even the implied warranty of

; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

; GNU General Public License for more details.

;

; You should have received a copy of the GNU General Public License

; along with s80x86.  If not, see .

cpu 8086

    times 1024 db 0

    ; An instruction with a modrm byte that writes to bp will implicitly use

    ; SS.  Make sure that subsequent instructions that don't have a modrm byte

    ; but default to DS don't think that they should be also using SS because

    ; BP was previously used.

    mov         bx, 0x2000

    mov         ss, bx

    mov         bx, 0x3000

    mov         ds, bx

    mov         bp, 0x100

    mov         word [bp + 0x100], 0xa5a5

    mov         ax, [bp + 0x100]

    and         ax, 0xa0a0

    mov         word [0x100], ax

    int3