EMU8086 adds value to wrong register
var1 db 1h, 2h
var2 db 2h
MOV AL, [var1 + 1]
MOV [var2], AL
If I emulate this code, I see EMU8086 set up AH (not AL) part of register AX. Why?
nasm emu8086
asked Nov 25 '18 at 12:52
Bartłomiej StasiakBartłomiej Stasiak
1
add a comment |
var1 db 1h, 2h
var2 db 2h
MOV AL, [var1 + 1]
MOV [var2], AL
If I emulate this code, I see EMU8086 set up AH (not AL) part of register AX. Why?
nasm emu8086
asked Nov 25 '18 at 12:52
Bartłomiej StasiakBartłomiej Stasiak
1
add a comment |
var1 db 1h, 2h
var2 db 2h
MOV AL, [var1 + 1]
MOV [var2], AL
If I emulate this code, I see EMU8086 set up AH (not AL) part of register AX. Why?
nasm emu8086
asked Nov 25 '18 at 12:52
Bartłomiej StasiakBartłomiej Stasiak
1
var1 db 1h, 2h
var2 db 2h
MOV AL, [var1 + 1]
MOV [var2], AL
If I emulate this code, I see EMU8086 set up AH (not AL) part of register AX. Why?
nasm emu8086
nasm emu8086
asked Nov 25 '18 at 12:52
Bartłomiej StasiakBartłomiej Stasiak
1
asked Nov 25 '18 at 12:52
Bartłomiej StasiakBartłomiej Stasiak
1
asked Nov 25 '18 at 12:52
Bartłomiej StasiakBartłomiej Stasiak
1
asked Nov 25 '18 at 12:52
Bartłomiej StasiakBartłomiej Stasiak
1
asked Nov 25 '18 at 12:52
Bartłomiej StasiakBartłomiej Stasiak
1
1
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
EMU8086 begins to process at the beginning (var1) and interpretes the bytes as instruction and following bytes accordingly. So, the code looks for EMU8086 like
ADD [BP+SI], AX
ADD AH, [BX + SI] + 00001
MOV [00002], AL
As you can see, this code changes AH but not AL. In short: EMU8086 requires a proper DOS program.
answered Nov 25 '18 at 16:07
rkhbrkhb
11.4k72142
add a comment |
Your Answer
StackExchange.ifUsing("editor", function () {
StackExchange.using("externalEditor", function () {
StackExchange.using("snippets", function () {
StackExchange.snippets.init();
});
});
}, "code-snippets");
StackExchange.ready(function() {
var channelOptions = {
tags: "".split(" "),
id: "1"
};
initTagRenderer("".split(" "), "".split(" "), channelOptions);
StackExchange.using("externalEditor", function() {
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled) {
StackExchange.using("snippets", function() {
createEditor();
});
}
else {
createEditor();
}
});
function createEditor() {
StackExchange.prepareEditor({
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: true,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: 10,
bindNavPrevention: true,
postfix: "",
imageUploader: {
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
},
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
});
}
});
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53467612%2femu8086-adds-value-to-wrong-register%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
EMU8086 begins to process at the beginning (var1) and interpretes the bytes as instruction and following bytes accordingly. So, the code looks for EMU8086 like
ADD [BP+SI], AX
ADD AH, [BX + SI] + 00001
MOV [00002], AL
As you can see, this code changes AH but not AL. In short: EMU8086 requires a proper DOS program.
answered Nov 25 '18 at 16:07
rkhbrkhb
11.4k72142
add a comment |
EMU8086 begins to process at the beginning (var1) and interpretes the bytes as instruction and following bytes accordingly. So, the code looks for EMU8086 like
ADD [BP+SI], AX
ADD AH, [BX + SI] + 00001
MOV [00002], AL
As you can see, this code changes AH but not AL. In short: EMU8086 requires a proper DOS program.
answered Nov 25 '18 at 16:07
rkhbrkhb
11.4k72142
add a comment |
EMU8086 begins to process at the beginning (var1) and interpretes the bytes as instruction and following bytes accordingly. So, the code looks for EMU8086 like
ADD [BP+SI], AX
ADD AH, [BX + SI] + 00001
MOV [00002], AL
As you can see, this code changes AH but not AL. In short: EMU8086 requires a proper DOS program.
answered Nov 25 '18 at 16:07
rkhbrkhb
11.4k72142
EMU8086 begins to process at the beginning (var1) and interpretes the bytes as instruction and following bytes accordingly. So, the code looks for EMU8086 like
ADD [BP+SI], AX
ADD AH, [BX + SI] + 00001
MOV [00002], AL
As you can see, this code changes AH but not AL. In short: EMU8086 requires a proper DOS program.
answered Nov 25 '18 at 16:07
rkhbrkhb
11.4k72142
answered Nov 25 '18 at 16:07
rkhbrkhb
11.4k72142
answered Nov 25 '18 at 16:07
rkhbrkhb
11.4k72142
answered Nov 25 '18 at 16:07
rkhbrkhb
11.4k72142
11.4k72142
add a comment |
add a comment |
Thanks for contributing an answer to Stack Overflow!
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
To learn more, see our tips on writing great answers.
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53467612%2femu8086-adds-value-to-wrong-register%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
