Search found 128 matches
- Thu 10 Dec, 2020 5:55 am
- Forum: General
- Topic: Anyone knows why Virtual 86 mode does not work properly well when playing DOS games on Windows 3.1 on MS-DOS 6.0 ?
- Replies: 32
- Views: 4305
Re: Anyone knows why Virtual 86 mode does not work properly well when playing DOS games on Windows 3.1 on MS-DOS 6.0 ?
For me it ran OK under Windows 3.1 and MS-DOS 5.0 with 16MB of RAM and from a 486SX-25 to a WinChip-200 with recompiler both on and off. On the later CPU some movements seem to be a bit faster than expected but nothing else happened. For all CPUs I had to add the line DMABUFFERSIZE=64 to the 386Enh ...
- Tue 08 Dec, 2020 6:25 pm
- Forum: General
- Topic: Anyone knows why Virtual 86 mode does not work properly well when playing DOS games on Windows 3.1 on MS-DOS 6.0 ?
- Replies: 32
- Views: 4305
Re: Anyone knows why Virtual 86 mode does not work properly well when playing DOS games on Windows 3.1 on MS-DOS 6.0 ?
And to try PCem 17 because I hadn't had time yetruben_balea wrote: ↑Tue 08 Dec, 2020 6:22 pmToday I've some free time so I will try Busytown under Windows 3.1 on a 386 or 486 to see if the lower CPU speed helps or not

- Tue 08 Dec, 2020 6:22 pm
- Forum: General
- Topic: Anyone knows why Virtual 86 mode does not work properly well when playing DOS games on Windows 3.1 on MS-DOS 6.0 ?
- Replies: 32
- Views: 4305
Re: Anyone knows why Virtual 86 mode does not work properly well when playing DOS games on Windows 3.1 on MS-DOS 6.0 ?
Today I've some free time so I will try Busytown under Windows 3.1 on a 386 or 486 to see if the lower CPU speed helps or not
- Thu 03 Dec, 2020 5:30 am
- Forum: General
- Topic: Anyone knows why Virtual 86 mode does not work properly well when playing DOS games on Windows 3.1 on MS-DOS 6.0 ?
- Replies: 32
- Views: 4305
Re: Anyone knows why Virtual 86 mode does not work properly well when playing DOS games on Windows 3.1 on MS-DOS 6.0 ?
Have you tried using a 386 or 486 CPU for 386 games? too much CPU speed is useless for games made to run fine on 16MHz systems and can be an issue...
- Wed 16 Sep, 2020 3:03 am
- Forum: General
- Topic: Configuring AMI 386dx bios for CD
- Replies: 6
- Views: 1303
Re: Configuring AMI 386dx bios for CD
I believe your driver is asking for a SCSI card in this case, especially that atapi wasn't a thing in 1993. There were sound cards with Mitsumi and/or Sony interfaces or IDE+Mitsumi+Sony or any other combination. Mitsumi used the same 40 pin cable as IDE but different pinout, very incompatible, lik...
- Thu 04 Jun, 2020 2:42 am
- Forum: General
- Topic: Is there a command line for this?
- Replies: 11
- Views: 3929
Re: Is there a command line for this?
Windows 95 RTM takes only 36.2MB with DirectX 6 installed Win95B+DX6.png And goes to 44.6MB after installing DirectX 7 Win95B+DX7.png DirectX 6 is enough (it's the version included on the game CD) to play Commandos: Behind Enemy Lines Win95B+DX6+Commandos1-BEL.jpg Steps were installing MS-DOS 5.00, ...
- Wed 03 Jun, 2020 7:27 pm
- Forum: General
- Topic: Is there a command line for this?
- Replies: 11
- Views: 3929
Re: Is there a command line for this?
Windows 95 can be really small removing (not installing) most useless (for gaming) things, I think that can be done only by upgrading from 3.x and using Windows 95 floppy release but I will take a look. I did it 25 years ago to use it on a 40MB hard drive.
- Sat 30 May, 2020 5:51 pm
- Forum: Development
- Topic: [Bug] IDE HDD stuttering emulation
- Replies: 46
- Views: 26177
Re: [Bug] IDE HDD stuttering emulation
I guess that DOSBox can throw data to guest programs almost as fast as the host OS can read it from disk drive while PCem has to emulate the BIOS calls, interrupts, DMA transfers and all those things at speeds acording to the emulated machine.
- Thu 28 May, 2020 6:35 am
- Forum: Development
- Topic: [Bug] IDE HDD stuttering emulation
- Replies: 46
- Views: 26177
Re: [Bug] IDE HDD stuttering emulation
I never liked FPS so I don't know much about Duke Nukem 3D and I killed my first Windows 98 installation with FAT32 in a few days, then to not have to deal again with data corruption due to some incompatible disk utilities I installed a secondary hard disk with MS-DOS 6.22 and Windows 3.1 on my comp...
- Thu 28 May, 2020 1:17 am
- Forum: Development
- Topic: [Bug] IDE HDD stuttering emulation
- Replies: 46
- Views: 26177
Re: [Bug] IDE HDD stuttering emulation

- Wed 27 May, 2020 8:56 pm
- Forum: Development
- Topic: [Bug] IDE HDD stuttering emulation
- Replies: 46
- Views: 26177
Re: [Bug] IDE HDD stuttering emulation
:o Since late 80s I have never seen an MS-DOS installation without SMARTDRV and definitelly all systems capable to run Duke Nukem 3D had SMARTDRV loaded by default... :arrow: For those too young (Windows 95+ users) installing MS-DOS isn't just taking a Windosws 9x boot floppy and running fdisk and f...
- Wed 06 May, 2020 11:09 pm
- Forum: General
- Topic: v16 is not formatting floppy disks
- Replies: 4
- Views: 2529
Re: v16 is not formatting floppy disks
That seems to happen only on ali1429 machines :arrow: Format fails sometimes on MR386DX too so I guess it can fail on any machine under appropriate circumstances, which of course I am unaware of. Also after wiping an old image with hex editor I found that when image file is filled with 0xFF instead...
- Thu 30 Apr, 2020 12:46 am
- Forum: General
- Topic: v16 is not formatting floppy disks
- Replies: 4
- Views: 2529
Re: v16 is not formatting floppy disks
That seems to happen only on ali1429 machines
- Sun 19 Apr, 2020 10:56 pm
- Forum: General
- Topic: I don't think KEYB SP is working right...
- Replies: 24
- Views: 14493
Re: I don't think KEYB SP is working right...
Keyboard works fine also on Windows 95, 98, 98SE and ME. Tested on a few systems from AMI WinBIOS to FIC VA-503+ and also on MR386DX clone using Cx486DLC/25 CPU and 64MB of RAM and plain VGA :!: Windows ME command prompt has always US layout and I don't know how to change it permanently but keyb.com...
- Sun 19 Apr, 2020 5:25 pm
- Forum: General
- Topic: I don't think KEYB SP is working right...
- Replies: 24
- Views: 14493
Re: I don't think KEYB SP is working right...
OK, on PC/XT systems using keybsp.com from DOS 3.20 (on DOS 6.22 with setver.exe) instead of keyb.com everything works fine execept ">" and "<" which were moved from key 43 to key 45 and new key 43 is "RETURN" which of course works as expected so ">" and "<" symbols are missing.
- Sun 19 Apr, 2020 2:20 am
- Forum: General
- Topic: I don't think KEYB SP is working right...
- Replies: 24
- Views: 14493
Re: I don't think KEYB SP is working right...
Tested using MS-DOS 6.22 3.5" 720KB boot floppy with the following configuration: CONFIG.SYS: device=display.sys con=(ega,,1) country=034,850,country.sys AUTOEXEC.BAT mode con codepage prepare=((850) ega.cpi) mode con codepage select=850 KEYB SP,,KEYBOARD.SYS Testing results: Already converted from ...
- Sat 18 Apr, 2020 9:51 pm
- Forum: General
- Topic: I don't think KEYB SP is working right...
- Replies: 24
- Views: 14493
Re: I don't think KEYB SP is working right...
Those are the differences between UK and SP keyboards:
And now I'll do some tests on MS-DOS 6.22 with KEYB SP on various machines...- Sat 18 Apr, 2020 9:18 pm
- Forum: General
- Topic: I don't think KEYB SP is working right...
- Replies: 24
- Views: 14493
Re: I don't think KEYB SP is working right...
Yes, give me a bit of googling time to see where keys are placed on UK keyboards
- Sat 18 Apr, 2020 5:45 pm
- Forum: General
- Topic: I don't think KEYB SP is working right...
- Replies: 24
- Views: 14493
Re: I don't think KEYB SP is working right...
Hi Sarah, did you tested it on a few machines? Because on some it works fine and on others it doesn't work at all. I'd posted my test results for v11 and v15 on a lot of machines: :!: It seems that forum links are now disabled or not working, at least for me... [url] http://pcem-emulator.co.uk/phpBB...
- Mon 30 Mar, 2020 5:19 pm
- Forum: General
- Topic: CPU ID:NEC V20 instead of Intel 8088 on PCEM / 86box
- Replies: 12
- Views: 7562
Re: CPU ID:NEC V20 instead of Intel 8088 on PCEM / 86box
Yes, TASM is very fussy. I don't know a lot of assembler, just enough to understand not too complex code and write very simple programs.
- Mon 30 Mar, 2020 3:58 pm
- Forum: General
- Topic: CPU ID:NEC V20 instead of Intel 8088 on PCEM / 86box
- Replies: 12
- Views: 7562
Re: CPU ID:NEC V20 instead of Intel 8088 on PCEM / 86box
Hmmm, a program with 386-instructions (" .386" at the beginning) running/testing on (e.g.) a NEC V20 or a 286? But you can take cpulevel from FreeDOS, public domain by Eric Auer 2004-2008. It only uses 386 instructions on 386 and higher CPUs and CPULEVEL does exactly the same. .386 was there only t...
- Sun 29 Mar, 2020 7:58 pm
- Forum: General
- Topic: CPU ID:NEC V20 instead of Intel 8088 on PCEM / 86box
- Replies: 12
- Views: 7562
Re: CPU ID:NEC V20 instead of Intel 8088 on PCEM / 86box
This other program can tell the very exact CPU including bus width: ; ******************************************************************** ; * * ; * CPU v2.2 (c) Septiembre 1992 CiriSOFT * ; * (c) Grupo Universitario de Informática - Valladolid * ; * * ; * Este programa determina el tipo de micropro...
- Thu 09 Jan, 2020 2:31 pm
- Forum: General
- Topic: [Bug] Commodore SL386SX-25 garbagge in the screen
- Replies: 5
- Views: 3817
Re: [Bug] Commodore SL386SX-25 garbagge in the screen
Hi, That TSR seems to be some kind of loader and then a plain 32KB BIOS image with the correct checksum, if it works better I guess it could be extracted and used in place of the original ROM to save the base memory wasted by the TSR. :arrow: Edit: That TSR contains a BIOS image without correct chec...
- Thu 09 Jan, 2020 3:02 am
- Forum: General
- Topic: [Bug] Commodore SL386SX-25 garbagge in the screen
- Replies: 5
- Views: 3817
Re: [Bug] Commodore SL386SX-25 garbagge in the screen
Try the AVGA2 drivers or even loading in autoexec.bat the Cirrus Logic TSR BIOS 1.2 which may include some fixes, I don't know if it can help for Windows 3.x drivers. It seems to provide VESA 1.02 extensions and make the card working as a Cirrus Logic GD5420 on Windows 9x. But I haven't tried anythi...
- Sat 31 Aug, 2019 1:51 am
- Forum: General
- Topic: IBM PS/1 2133
- Replies: 2
- Views: 3014
Re: IBM PS/1 2133
Some PS/1 2133 emulation is already implemented in https://github.com/86Box/86Box but please read this post before: viewtopic.php?f=2&t=502 

- Mon 12 Aug, 2019 4:14 pm
- Forum: General
- Topic: v15 on macOS - fail to compile
- Replies: 5
- Views: 5464
Re: v15 on macOS - fail to compile
I'm glad it helped you! If that concerns several files it can be easier and faster to edit the Makefile instead, I noted that the provided Makefile.osx64-wx-sdl2 already has the switch -Doff64_t=__off64_t in CFLAGS variable: CFLAGS = -D__unix=1 -DPCEM_RENDER_WITH_TIMER -DPCEM_RENDER_TIMER_LOOP -Dfop...
- Mon 12 Aug, 2019 6:15 am
- Forum: General
- Topic: v15 on macOS - fail to compile
- Replies: 5
- Views: 5464
Re: v15 on macOS - fail to compile
In OS X off_t is already 64 bits so edit esdi_at.c and change the code from: #include <sys/types.h> #include "ibm.h" to: #include <sys/types.h> #define off64_t off_t #include "ibm.h" or alternatively to: #include <sys/types.h> typedef off_t off64_t; #include "ibm.h" ...and try to compile again. I'm ...
- Sat 03 Aug, 2019 11:05 pm
- Forum: General
- Topic: Raspbian can't compile v15
- Replies: 9
- Views: 10274
Re: Raspbian can't compile v15
I didn't have any major trouble to compile PCem, the worst part was to build wxWidgets, it took a lot of time because I had to use a single thread to keep the my Pi cool. That's because I'm using a Pi 3 B+ with the official touchscreen and its corresponding case without active cooling, using all cor...
- Sun 28 Jul, 2019 1:47 am
- Forum: Development
- Topic: Compiling PCem for Windows from Windows Subsystem for Linux with Ubuntu
- Replies: 2
- Views: 3744
Re: Compiling PCem for Windows from Windows Subsystem for Linux with Ubuntu
Thanks shermanp, that helped but it seems that my setup is missing a lot more things to be able to cross compile... So I installed VcXsrv to try the Linux executable and it worked up to certain point: PCem with WSL and VcXsrv.png Then after starting a machine I get some errors in the console about t...
- Sat 27 Jul, 2019 3:24 am
- Forum: Development
- Topic: Compiling PCem for Windows from Windows Subsystem for Linux with Ubuntu
- Replies: 2
- Views: 3744
Compiling PCem for Windows from Windows Subsystem for Linux with Ubuntu
In part for fun and in part because MSYS is very slow I tried to compile PCem under the WSL and it's at least 3 times faster than MSYS. Of course I got an executable for Linux. Now I'm trying to cross compile it for Windows but I get an error about OpenAL: root@cp1:~/pcem# ./configure --host=x86_64-...