Jazz Jackrabbit freezes in pure DOS but works in Windows 98 \ VOGONS

Jazz Jackrabbit freezes in pure DOS but works in Windows 98

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First post, by Azarien

Posted on 2024-09-22, 10:22

Azarien Offline

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Posts: 918
Joined: 2015-05-14, 07:14

Jazz Jackrabbit (GOG version) freezes with black screen and blinking cursor on startup. This happens in DOS 7.1 from Windows 98, but the game works fine when run from Windows 98.
I tried changing the sound settings, even with no sound but nothing changes.

Pentium MMX 233 MHz, AWE 64, TNT2 M64.

Most DOS games work with no issues. Well, except Prehistorik 1 which also freezes in DOS after few seconds of gameplay, and also works fine in Windows… this may be a related issue or just a coincidence.

(I'll post my autoexec.bat/config.sys later)

Reply 1 of 3, by dominusprog

Posted on 2024-09-22, 11:25

dominusprog Online

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Post the content for config.sys and autoexec.bat.

A-Trend ATC-1020 V1.1 ❇ Cyrix 6x86 150+ @ 120MHz ❇ 32MiB EDO RAM (8MiBx4) ❇ A-Trend S3 Trio64V2 2MiB
Aztech Pro16 II-3D PnP ❇ 8.4GiB Quantum Fireball ❇ Win95 OSR2 Plus!

Reply 2 of 3, by konc

Posted on 2024-09-23, 06:47

konc Offline

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Boot clean in DOS holding shift down as a test, does it work? Remove/comment things out in config and autoexec to find the culprit. My bet is on the memory manager

Reply 3 of 3, by Azarien

Posted on 2024-09-23, 09:56

Azarien Offline

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Rank: Oldbie
Posts: 918
Joined: 2015-05-14, 07:14

konc wrote on 2024-09-23, 06:47:

Boot clean in DOS holding shift down as a test, does it work? Remove/comment things out in config and autoexec to find the culprit. My bet is on the memory manager

Yes it works in clean configuration, and now I realized the only thing I need to change is NOEMS to RAM in EMM386 and the game works.
Does Jazz require EMS memory? (I don't think so…)

1[menu]
2menuitem=WINDOWS
3menuitem=DOS
4menudefault=WINDOWS,3
5
6[common]
7dos=high,umb,noauto
8files=20
9buffers=10
10lastdrive=f
11stacks=9,256
12fcbs=1,0
13device=c:\windows\himem.sys
14Country=048,852,C:\WINDOWS\COMMAND\country.sys
15
16[WINDOWS]
17device=c:\windows\ifshlp.sys
18device=c:\windows\emm386.exe ram
19devicehigh=C:\WINDOWS\COMMAND\display.sys con=(ega,,1)
20
21[DOS]
22device=c:\windows\emm386.exe noems
23devicehigh=C:\WINDOWS\COMMAND\display.sys con=(ega,,1)
24devicehigh=c:\windows\command\ebd\oakcdrom.sys /d:cdrom01

1@echo off
2set temp=c:\
3SET SOUND=C:\PROGRA~1\CREATIVE\CTSND
4SET MIDI=SYNTH:1 MAP:E MODE:0
5SET BLASTER=A220 I5 D1 H5 P330 E620 T6 
6mode con rate=32 delay=1
7goto %config%
8
9:windows
10mode con codepage prepare=((852) C:\WINDOWS\COMMAND\ega.cpi)
11mode con codepage select=852
12lh keyb pl,,C:\WINDOWS\COMMAND\keybrd4.sys
13lh C:\windows\command\doskey.com
14lh c:\windows\smartdrv.exe
15win
16goto end
17
18:dos
19mode con codepage prepare=((852) C:\WINDOWS\COMMAND\ega.cpi)
20mode con codepage select=852
21lh keyb pl,,C:\WINDOWS\COMMAND\keybrd4.sys
22lh C:\windows\command\doskey.com
23lh c:\windows\smartdrv.exe 1024
24lh d:\utils\ctmouse.exe
25c:\windows\ctcm.exe
26%sound%\aweutil.com /s /r:50 /c:25
27lh c:\windows\command\mscdex.exe /d:cdrom01 /l:e
28d:\utils\mixerset.exe /q
29goto end
30
31:end

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