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First post, by Guest

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Hi,
I have a directory reading program called HotDIR, which while using DOS I got into the habit of using. It used to make a colourful version of dir, and I would have liked it to work again on DOSBox. I think that however your implementation of directories is not compatible with some old way of doing it. Because it's free, I have no trouble sending it over the internet. I have included it at the bottom of this post as a UUEncoded file. (WinZip can open it on Windows, other OS users should be smart enough to know how to open it) Put it in a file called D.UUE, and add a blank line at the beginning and end of the file.

Additionally, I have a game called Lamers, which complains that there is "Not Enough Memory", which is impossible, because it used to run on 286s. I think that the way memory is "counted" by programs is not the same as how you have implemented it. For example, Commander Keen 4 says there is 64KB of Expanded memory, but no Extended, even when some 16MB of memory is available according to mem in DOSBox. If you would like to see this further, it is a free game, and I have found it is available here.

Thanks.

UUEncoded D.COM follows:

begin 0666 D.COM
MZ7D1&ULR2@`-"E-E<FEA;"!.=6UB97(Z(#`P,#(W#0H`6S(M,C@M.#==#0I(
M;W1$25(@,BXP(&ES($-O<'ER:6=H="`H0RD@,3DX-R!B>2!4;VYY($]V97)F
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M!S\_/P<_/S\'/S\_!S\_/P<_/S\'/S\_!P`/`PP##0()#`H."PH'!`````#_
M3@`8/%!A=&-H70``````````````````````"@``````````````````````
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M````````````````````````````````````````````````````````````
M````````````````````````3B<`$P`,_P``````"``_/S\_/S\_/S\_/P``
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Show last 48 lines
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end

Reply 1 of 6, by taiken7

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Yes I agree memory is a little flimsy at the moment;

Basically all anything initially sees is 1 free XMS or EMS page.
If they take it then 1 page is left .. this repeats until memory
can no longer be allocated, then there are 0 pages available.

(This works in general, except where they check the number of pages
*first*; but I think you've found the only examples so far..)

[Work-in-progress, currently adding real page counts to dosbox...]

Reply 2 of 6, by taiken7

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Note that if you have debug enabled;

00DD:0100 B8BF79 mov ax,79BF
00DD:0103 BAC207 mov dx,07C2
00DD:0106 05ED00 add ax,00ED
<1>
00DD:0109 3B060200 cmp ax,[0002] ds:[0002]=7AA5
<00DD:010D 731A jnc 00000129 ($+1a) -->
This is failing.

(Not sure why it expects that (79BF+ED)=ds:[0002]...
should be 7AAC; but instead finds 7AA5?!

Anyhow, at <1> press enter and type "SR AX 7AA5" (ie that value at ds:[0002]).

Reply 3 of 6, by taiken7

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Hotdir causes a division by zero at 006E:0CBB (Div BX) where BX=0.
Since dosbox doesnt know how to handle these by default it loops infinitely.
(INT0)
Source of zero: 00DD:0DD2 int 21 function (32), Not supported yet.

Reply 4 of 6, by Srecko

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ds:0002 is part of PSP. Note from dosbox's source about that word:
" Segment of first byte beyond memory allocated or program "

game will run If line 342 in dos_execute.cpp is changed to, for example:

SetupPSP(pspseg,memsize+8,envseg);

So, 'memsize' value is too small and game thinks that memory is full.
Value is calculated from EXE header which might be wrong (but then it wouldn't run in DOS)
or Dosbox doesn't calculate correctly ('maxsize' variable).

-EDIT: yes, memsize in PSP is 8E44 in real DOS, and 7A36 in Dosbox.

Reply 5 of 6, by Guest

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Since this is the place for fixing the current release of dosbox,
I cant post a patch for dosbox; so here is "D.COM" patched
(see if you can spot where the DIV by ZERO was occuring);

Have fun


begin 0666 D.COM
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M!S\_/P<_/S\'/S\_!S\_/P<_/S\'/S\_!P`/`PP##0()#`H."PH'!`````#_
M3@`8/%!A=&-H70``````````````````````"@``````````````````````
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end

Reply 6 of 6, by taiken7

User metadata
Rank Member
Rank
Member

Since this is the place for fixing the current release of dosbox,
I cant post a patch for dosbox; so here is "D.COM" patched
(see if you can spot where the DIV by ZERO was occuring);

Have fun


begin 0666 D.COM
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end

(Now how do I delete the previous post.. )