Search found 48 matches

by Zup
Wed 13 Jun, 2018 6:44 am
Forum: General
Topic: SYS'ing with DOS 3.30 on XT using T130B
Replies: 2
Views: 189

Re: SYS'ing with DOS 3.30 on XT using T130B

Is your disk empty? As far as I remember, in MS-DOS 1, 2 and 3 SYS needed an empty disk to work. MS-DOS 4 needed a few sectors free at the beginning of the disk or it wouldn't work (so, in practice, it was the same as needing a completely empty disk). In DOS 5 an 6, SYS could work in any disk (if it...
by Zup
Wed 23 May, 2018 4:30 pm
Forum: General
Topic: Using special machine types
Replies: 5
Views: 484

Re: Using special machine types

PCem is not entirely cycle accurate, but the performance should be similar. Assuming that your system can emulate your machines at 100% speed, you should note performance differences (i.e.: the IBM AT should be slower than a PC-30 III, because the former had a 6 or 8 Mhz but the latter shipped with ...
by Zup
Sun 20 May, 2018 9:56 am
Forum: General
Topic: Using special machine types
Replies: 5
Views: 484

Re: Using special machine types

They have different BIOSes, chipsets, components and feelings. Original IBM AT ran at 6 or 8 Mhz, but later machines (i.e.: Award 286 clone) could have 25 Mhz CPUs. Some chipsets were fasters than others or have some capabilities (EMM) fully integrated on BIOS. Also, the machines came with different...
by Zup
Sat 14 Apr, 2018 7:59 am
Forum: Development
Topic: v14 compatibility & bug list (WIP)
Replies: 20
Views: 2511

Re: v14 compatibility & bug list (WIP)

I've reported this keyboard bug a few times... has it been solved? I guess that "flushing" all keys pressed (so the keyboard status is without any key pressed) after recovering focus will do the trick. Or maybe is a flag (like "Ctrl was pressed")? In any case, pressing again Ctrl to "unstuck" the ke...
by Zup
Thu 12 Apr, 2018 5:20 pm
Forum: General
Topic: AudioPCI impressions
Replies: 19
Views: 2254

Re: AudioPCI impressions

My wife had a real Pentium 75 and a Sound Blaster PCI 64, and when playing MIDI some kind of interference could be heard. I guess that was because PCI64 uses system memory to play MIDI, and it was a bus hog. After changing her computer (to a PIII 500 or so), MIDI played fine... but in any case, that...
by Zup
Sat 24 Feb, 2018 10:03 pm
Forum: Development
Topic: [BUG]Amstrad PC1640 Video
Replies: 8
Views: 907

Re: [BUG]Amstrad PC1640 Video

I think you've misread it -- the 'Secondary EGA' settings mean that the built-in EGA remains active, but a CGA or MDA card in an expansion slot is used as the primary display. Sorry, I was referring to the fact that second and third line of settings imply that Amstrad could set up the computer with...
by Zup
Fri 23 Feb, 2018 7:42 am
Forum: Development
Topic: [BUG]Amstrad PC1640 Video
Replies: 8
Views: 907

Re: [BUG]Amstrad PC1640 Video

How about displays? AFAIK, PC1640 was sold with three displays: MD (monochrome), CD (colour), ECD (EGA colour). I'm not sure about it, but I guess that MD and CD were CGA monitors (so they couldn't display EGA modes). Maybe the card is not "locked" (you could try to start EGA modes with any display)...
by Zup
Sun 31 Dec, 2017 11:20 am
Forum: General
Topic: Amstrad PC oddities
Replies: 0
Views: 470

Amstrad PC oddities

So I've updated to PCEM v13.1 (without patches) and I've been testing some Amstrad PCs, and I've got some bugs to report. 1.- Since the first time I tried PCem there is a bug on keyboard controller. If I switch out of PCem using CTRL+End, after going back to PCem it seems that control key has became...
by Zup
Tue 06 Jun, 2017 6:22 am
Forum: Development
Topic: [Linux] GUI discussion
Replies: 218
Views: 20770

Re: [Linux] GUI discussion

Does this GUI works in Windows?

I like that windows that shows the current video mode...
by Zup
Fri 26 May, 2017 8:27 pm
Forum: General
Topic: Physical disk as Pcem hard disk?
Replies: 9
Views: 1321

Re: Physical disk as Pcem hard disk?

I've compiled v12 version of PCem with my Debian (64 bits). It needed two changes to work (both 'depcomp' and 'missing' links are pointing to older versions of automake; needed to add -m32 to compiler flags). After that, I've tried to select /dev/sdc as HDD image file but it didn't work. But after m...
by Zup
Sat 13 May, 2017 7:21 am
Forum: General
Topic: Physical disk as Pcem hard disk?
Replies: 9
Views: 1321

Re: Physical disk as Pcem hard disk?

I would like to this feature request! I currently have a 512 MB, 1 GB and 2 GB flash drive formatted as a FAT partition, a 1 GB and 2 GB compact flash and a 2 GB SD card that can be used to run under MS-DOS/Windows 95. I suspect reading from a FAT32 host would be much easier to implement Sorry, may...
by Zup
Fri 12 May, 2017 5:54 pm
Forum: General
Topic: Physical disk as Pcem hard disk?
Replies: 9
Views: 1321

Physical disk as Pcem hard disk?

Is it possible? The entire story (so you can figure what am I trying to do): I've got a ZX-Uno . It is a FPGA based computer with the same size factor as a Raspberry Pi. Although it was made thinking about doing a hardware emulated ZX Spectrum, the designers added the capability to hold and use up t...
by Zup
Fri 21 Apr, 2017 5:58 am
Forum: General
Topic: Expanded Memory Boards for 8088/8086 machines?
Replies: 18
Views: 2166

Re: Expanded Memory Boards for 8088/8086 machines?

PC-compatibles are limited to 640k (which IIRC wasn't enough to link Microsoft's linker, so they had a special machine with 1MB addressable RAM just for linking the linker :) The 640k barrier is a convention, not a limit. The CPU can address up to 1 Mb, but DOS gets only the first 640 Kb (because m...
by Zup
Fri 14 Apr, 2017 9:30 am
Forum: General
Topic: [HOWTO] Linux: Mount & create pcem images
Replies: 6
Views: 3138

Re: [HOWTO] Linux: Mount & create pcem images

Note that the mount instruction will mount the first partition. If you have more than one partition, you'll need other instruction to access other partitions.
by Zup
Fri 17 Mar, 2017 12:47 pm
Forum: General
Topic: Strange keyboard bug
Replies: 0
Views: 442

Strange keyboard bug

I've got some kind of strange bug with keyboard on v12 (official build). It seems (almost) the same keyboard bug reported here . - It happened to me on some Amstrad PCs (Amstrad PC2086, Sinclair PC200). - Other computers (i.e.: Compaq 386, 430VX) are not affected. - After pressing CTRL+END to switch...
by Zup
Tue 14 Mar, 2017 7:01 am
Forum: General
Topic: Internet with Windows 95?
Replies: 8
Views: 2120

Re: Internet with Windows 95?

I am not sure you need any Microsoft update patches to run Win95. Obviously having the OSR2 version might help, but on its own Win95 can do many tasks without additional patches from Microsoft. Back then you did not need constant patches, service packs and updates from Microsoft. Indeed, Win98 alwa...
by Zup
Sun 12 Mar, 2017 12:20 pm
Forum: General
Topic: Random screenshots
Replies: 5
Views: 1081

Re: Random screenshots

Awesome! How did you get Windows 95 J to achieve 9 FAT16 partitions? :D If he used only a hard disk, I guess he defined a system partition and then two extended partitions with four FAT16 volumes inside. Or he could have used more hard disks (up to three). I know for a fact that there is a way for ...
by Zup
Sun 05 Mar, 2017 10:31 am
Forum: Development
Topic: ST-412/ST-506/ESDI hard drive emulation?
Replies: 51
Views: 5935

Re: ST-412/ST-506/ESDI hard drive emulation?

From what I can see, the Xebec controller is a bit limited in what drives are supported - the first two variants only support 10 MB drives, the later (AT) variant also supports 20. Probably a more flexible controller would be the best one to start with I think. Keep on mind that some computers (i.e...
by Zup
Fri 24 Feb, 2017 6:58 pm
Forum: General
Topic: Feature request: revamping config files
Replies: 53
Views: 6072

Re: Feature request: revamping config files

I'd use alias instead of full strings. I mean, using "pcxt" (the rom directory) is less prone to errors than "Generic XT clone".

Also, getting the index from an array of strings is not so complex and performance is not a concern (it will be done only at startup).
by Zup
Thu 23 Feb, 2017 7:37 am
Forum: General
Topic: Feature request: revamping config files
Replies: 53
Views: 6072

Re: Feature request: revamping config files

YES! The config file architecture is very annoying. Everything defaults to pcem.cfg when saving. I've had to resort to making multiple copies of the whole folder with all extraneous rom/bios files just to accommodate different emulated PC's. Although the default saving is to pcem.cfg (and the defau...
by Zup
Tue 21 Feb, 2017 10:22 pm
Forum: General
Topic: Qestions about the Linux build?
Replies: 4
Views: 1004

Re: Qestions about the Linux build?

Maybe that's the problem. In Unix world, ALI1429G.AMW, ali1429g.amw and ALI1429g.amw are different things. In Windows, capitalisation doesn't matter. Note that Linux will check capitalisation even if the files are placed in FAT or NTFS filesystems. Check the source code (the file mem.c) to find the ...
by Zup
Tue 21 Feb, 2017 8:52 am
Forum: General
Topic: Feature request: revamping config files
Replies: 53
Views: 6072

Feature request: revamping config files

PCem has some lists with machine types, CPU types and so on. When new releases come, items in those lists change their order so old config can be no longer valid. In some cases (machine type has changed) they may work. On other cases (CPU type is invalid), PCem will stuck on a grey screen or crash w...
by Zup
Sun 18 Dec, 2016 9:58 am
Forum: General
Topic: PCem and a new PC
Replies: 12
Views: 2935

Re: PCem and a new PC

Why Intel? Although Intel has CPUs with higher performance than AMD (so, in the high end Intel beats AMD), in the middle and lower end AMD usually offers better price for the same performance. On the lower end (APUs), Intel integrated video cards suuuuucks.

Is there any reason to prefer Intel?
by Zup
Thu 17 Nov, 2016 5:10 pm
Forum: General
Topic: Is PCEm the only emulator of its kind?
Replies: 11
Views: 3012

Re: Is PCEm the only emulator of its kind?

I originally came to know about PCEm following a Vogons thread which unceremoniously labeled it as "Another PC Emulator". But frankly, I can't seem to find a peer in terms of an architecture that allows for all the basic components of an X86 pc to be emulated separately, complete with BIOS, specifi...
by Zup
Mon 19 Sep, 2016 6:05 am
Forum: Development
Topic: An increase of memory on Voodoo.
Replies: 9
Views: 2189

Re: An increase of memory on Voodoo.

Voodoo2 support up to 12 MB per card, so in SLI you get the whooping amount of 24 MB Are you sure? AFAIK, in Voodoo2 SLI a card was drawing odd lines and the other card drawed even lines. The memory was NOT shared between cards, but both cards had to have the same textures loaded (because they were...
by Zup
Tue 23 Aug, 2016 6:07 am
Forum: General
Topic: Bug? Strange behaviour with floppy images and Amstrad keys
Replies: 2
Views: 971

Re: Bug? Strange behaviour with floppy images and Amstrad ke

But floppy B: was defined as 720k on PCem, BIOS and the disk image (737280 bytes, with DOS format). If both A: and B: are defined as 720k it works, but if A: is defined as 1.44Mb and B: is defined as 720Kb, formatting B: won't work. I forgot to mention: I'm using "vanilla" PCem v11, not any testing ...
by Zup
Mon 22 Aug, 2016 1:26 pm
Forum: General
Topic: [Req] Mega-Turbo switch
Replies: 0
Views: 941

[Req] Mega-Turbo switch

Can PCem have any ultra-hyper-mega-turbo switch? Some emulators (i.e.: ZX Spin) have some kind of switch (in ZX Spin the hotkey is F1) that forces the emulator going crazy and execute everything as fast as it can. That could be useful for slow operations like copying or installing things from disket...
by Zup
Mon 22 Aug, 2016 1:12 pm
Forum: General
Topic: Bug? Strange behaviour with floppy images and Amstrad keys
Replies: 2
Views: 971

Bug? Strange behaviour with floppy images and Amstrad keys

I've got some (screwed up) disk images and I was trying to fix them. The images were 1474560 bytes long (= 80x2x18) but they were formatted as 720k (=80x2x9). To fix them (store as 737280 bytes images, same disk format as declared) I set up a ami486 machine with two disk drives. The first one was a ...
by Zup
Mon 15 Aug, 2016 5:39 pm
Forum: General
Topic: The System16 System Emulator video.
Replies: 2
Views: 880

Re: The System16 System Emulator video.

It seems it's doubling lines, producing a 320x480 lines output. Does it happen with other video cards?
by Zup
Tue 28 Jun, 2016 6:30 am
Forum: General
Topic: Extended ReadMe or PCem Hardware Documentation Project
Replies: 13
Views: 3948

Re: Extended ReadMe or PCem Hardware Documentation Project

My almost complete list, with some notes: IBM 5150 PC IBM PCjr Tandy 1000 Tandy 1000HX Tandy 1000SL/2 There was no HD for this computers, can use 3rd party HDs (usually type 1/2/3) Sinclair PC200 (a.k.a. Amstrad PC20) Amstrad offered no HD, but there were 3rd party HDs. Schneider EuroPC A external H...