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Re: GloriousCow's PC Emulation Blog

Posted on 2023-06-10, 19:21

Saw the thread about running Area5150, awesome work, congrats! And the built in debugger is what I was looking for a long time, excellent! Could you please add Adlib / Soundblaster device? How accurate is the VGA emulation? Will it build under linux?

Re: CPU test program for 8086 emulator

Posted on 2022-08-09, 07:05

phix wrote on 2021-02-01, 09:13: But I can still not boot any version of MS-DOS or Windows 3.0 yet. So there are obviously still issues with my emulator. tried to boot from different floppy and hdd images that I use for PCem but had no success .. still an issue or am I doing something wrong? used …

Re: CPU test program for 8086 emulator

Posted on 2022-06-21, 19:30

unfortunately VirtualXT doesn't build on Ubuntu 18.04 (latest Zig from github) .. "Semantic Analysis [1615/2537] ./build.zig:221:23:error: no member named 'defineCMacroRaw' in struct 'std.build.LibExeObjStep' pirepheral.defineCMacroRaw("PI8088"); ^ ./build.zig:150:22: error: container 'builtin' has …

[MSDOS] Playing VGM Files for YM3812 (OPL)

Posted on 2022-02-27, 13:51

Hi, I'm trying to write a small interrupt driven player for YM3812 VGM-Files for MSDOS. The format of the VGM File for OPL seems to be quite straight forward: The VGM Command 0x5A is followed by the OPL register and the value and VGM Command 0x61 is a delay command followed by a 16Bit-word ( …

Re: Empty blocks in hard drive space

Posted on 2021-07-28, 11:49

I'm in the middle of creating a bootable FAT16 hard drive image for use with many PC emulators. I then used a binary editor to examine the valid image. I compared it to a FAT16 image with MBR (master boot record) intact. The data is valid, but what I did notice is that right after the partition …

Re: dilemma of EGA & VGA combo

Posted on 2021-06-11, 08:04

since EGA/CGA 640x200 was discussed here just a short question: I tested "Gauntlet", 'cause it was said, the game uses 256x200 ( http://nerdlypleasures.blogspot.com/2014/09/oddball-ega-and-vga-resolutions-when.html) .. but PCem tells me 640x200 .. this seems for me more realistic, because it's a …

Re: [Linux/WSL] Host to guest mapper

Posted on 2021-05-03, 16:36

Although the tool was developed on and for Linux and it uses a lot of "non portable linux functions" like mmap, fallocate or fstatfs, so compiling with cygwin/mingw isn't unfortunately an option, the tool runs flawlessly with WSL (Windows subsystem for Linux, tested with debian, but should work with …

Re: Emulators with integrated debugger?

Posted on 2021-04-30, 06:32

I played around with QEMU/Bochs & GDB remote debugging, using the frontends Nemiver & Gede (Linux) and gdb terminal .. as some mentioned before, debugging of i8086 real mode code is not really possible (from my limited experiences), at least not with the frontends (from gdb terminal okay) ... of …

Re: [MAME] Mounting disk images?

Posted on 2021-04-29, 16:49

okay, finally I got it and I'm very impressed about the configuration options .. (for "my" machine "ct486"): first list all device slots: mame ct486 -listslots it shows me "board3:ide:ide:0" and "board3:ide:ide:1" that can be connect to "cdrom" or "hdd", so I added (command line) "-board3:ide:ide:1 …

Re: [MAME] Mounting disk images?

Posted on 2021-04-28, 19:05

the only system I got running was "ct486" (PC/AT 486 with CS4031 chipset, Linux/MAME 0.229) ... starting from command line with -hard1 [image] ... -flop1 option is working too ... unfortunately I didn't find any MAME howtos about PC Emulation & possible command line parameters ... in MAME UI it …

[MAME] Mounting disk images?

Posted on 2021-04-28, 08:09

can anyone tell me, if it is possible (and how), to mount more than one hdd disk image with MAME? there is an option "-harddisk" or "-hard1" that works, but it seems there is no option for mounting more than one image, "hard2" is unknown... the "-debug" window allows only mounting of one hdd image …

Re: [Linux] Host to guest mapper

Posted on 2021-04-27, 08:11

Good news! Tested it with Windows 98. If you change the properties of the drive, which is associated with the swap42 image, to "removable" (hardware manager) Windows detects filesystem changes by itself so it's possible to do a rescan even for Windows 98 as guest OS (if windows monitors it by volume …

[Linux/WSL] Host to guest mapper

Posted on 2021-04-26, 13:14

Hi, creating images, mounting them and file sharing can be annoying, especially with MSDOS as guest OS without network sharing, so I coded this little tool to map a host directory to a raw hdd image, which could be refreshed from inside the guest, so cross development and testing is possible like …

Re: Emulation of x86 PCs of former East Germany?

Posted on 2021-03-18, 19:44

How about https://a7100emulation.hpage.com/neuigkeiten.html ? Not the a 7150 maybe, but the older and more idiosyncratic model I guess. https://a7100-emulation.gitlab.io/html/news.html wow, that's cool ! and from the screenshots - gfx power :) ... it's itching in the fingers to do some demo coding …

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