Search found 64 matches

by Zup
Tue 21 May, 2019 5:16 am
Forum: General
Topic: [OT-ish] fitting Linux distros?
Replies: 8
Views: 264

Re: [OT-ish] fitting Linux distros?

I'd try a Puppy Linux, but that can be tricky. It seems that 4.x versions can run on 128 Mb, and that versions are easy to find/download. The tricky part is that you'll need to install it to hard disk (do NOT use a frugal installation), then add devx packages (to get your GCC, but I don't know which...
by Zup
Tue 21 May, 2019 5:08 am
Forum: General
Topic: Raspbian can't compile v15
Replies: 5
Views: 270

Re: Raspbian can't compile v15

A Raspberry is a fairly slow device... what about cross-compiling from a PC to a Raspberry?
by Zup
Sun 12 May, 2019 7:29 am
Forum: General
Topic: Speed timings for emulated hard disks
Replies: 8
Views: 733

Re: Speed timings for emulated hard disks

I rather like the idea that when creating an HD, it could be possible to select from a list of makes and models, much like you can with other hardware. Granted, it'd be little more than a cosmetic thing right now, but it'd make sizing drives easier, and not coming up with wacky geometry some OSes m...
by Zup
Sat 23 Feb, 2019 6:54 am
Forum: General
Topic: Shutdown Or Close Window
Replies: 3
Views: 749

Re: Shutdown Or Close Window

I guess you're using Windows 95 or 98. In that systems, the proper closing procedure would be goint to Start Menu on the emulated machine, and choose Shutdown. Then wait until a screen announces that you can safely shutdown your computer and then close PCem. Failing to do so means that some files on...
by Zup
Tue 12 Feb, 2019 6:16 am
Forum: General
Topic: Maybe create a set of recommended system profiles?
Replies: 7
Views: 1560

Re: Maybe create a set of recommended system profiles?

I guess the only standard profile would be an XT with MDA/CGA with or without IDE hard disk, because this are the only roms available in PCem web (and everybody should have them), at least if you try to distribute them. For other "standard" computers, I'll mimic existing PCs. For PC/XT/AT computers ...
by Zup
Sat 26 Jan, 2019 7:58 am
Forum: General
Topic: CD Image Format - Blindwrite
Replies: 5
Views: 1307

Re: CD Image Format - Blindwrite

What about using a virtual drive like Alcohol 52% or Daemon Tools?

Mount your CD image on the virtual drive and then use it from PCem.
by Zup
Wed 23 Jan, 2019 6:17 am
Forum: General
Topic: Wordbasic overflow error 6 with DX processor
Replies: 5
Views: 1323

Re: Wordbasic overflow error 6 with DX processor

Virtualbox is virtual machine software, PCem is an emulator - they aren't really the same thing at all. Does this happen with real 486DX hardware? It's odd that it only happens with 486DX CPUs. This sort of thing leads me to believe that it's an actual bug with them or the recompiler (which is slat...
by Zup
Fri 02 Nov, 2018 4:51 pm
Forum: General
Topic: How to add an external ROM like XT-IDE?
Replies: 2
Views: 866

Re: How to add an external ROM like XT-IDE?

To use XT-IDE ROM, open the configuration and go to the disks tab. In HDD, you must choose [IDE] XT-IDE or [IDE] XT-IDE (AT) and PCem will use that ROM. (If your computer is a IBM PS/1 model 2011, PCem will use a specific XT-IDE ROM automatically) The bad news is that you can only load XT-IDE ROMs, ...
by Zup
Sat 20 Oct, 2018 6:40 am
Forum: General
Topic: [Question] 5.25 1.2mb disks on DOS 2.0?
Replies: 6
Views: 2064

Re: [Question] 5.25 1.2mb disks on DOS 2.0?

On second thought, HD disks needs faster FDCs that maybe weren't supported in plain DOS 2.0, but I wonder it there existed a driver that could read HD floppies. If the limit is imposed by the FDC (I mean, the routines that access the FDC) it have sense that the limit are DD disks, but DOS should be ...
by Zup
Fri 19 Oct, 2018 5:21 am
Forum: General
Topic: [Question] 5.25 1.2mb disks on DOS 2.0?
Replies: 6
Views: 2064

Re: [Question] 5.25 1.2mb disks on DOS 2.0?

Maybe is not related... My ZX Spectrum +3 (a Z80 machine) had a 3 inch floppy drive (single sided, 180k/side) but can be fitted with 3.5 inch drives. +3DOS will format any disk to 180k, but (with the right tools) can use the whole 720k and plain +3DOS (was stored in ROM, so it can't be changed easil...
by Zup
Sun 14 Oct, 2018 3:59 pm
Forum: General
Topic: Host machine survey
Replies: 127
Views: 50984

Re: Host machine survey

It is possible to include the fastest virtual CPU that is possible to emulate with the physical one? Or include a FAQ or pin a post with this information. Mine is i5-3210M (2 cores / 4 threads at 2.5 GHz) and I am able to emulate up to Pentium@75 at almost full speed. I've updated my machine (mainb...
by Zup
Fri 12 Oct, 2018 6:46 am
Forum: General
Topic: External USB Floppy Drive
Replies: 2
Views: 749

Re: External USB Floppy Drive

USB floppies (usually) are very limited. Usually they only support 1.44Mb disk, with 2 sides, 80 tracks, 18 sectors/track (starting at 0), and 512 bytes/sector (some of them also support 9 sectors/track). Usually there is no way to read odd-numbered or odd-sized sectors (Opera Soft games used to hav...
by Zup
Tue 11 Sep, 2018 6:00 am
Forum: General
Topic: Emulating an Amstrad PC5286
Replies: 9
Views: 2247

Re: Emulating an Amstrad PC5286

I wonder if MAME/MESS guys have some infos/dumps for these computers (and the more interesting Amstrad 2000 series). MESS has a driver (I don't know if it works or is a skeleton driver) for Amstrad PC2386, but there are no drivers for other (unemulated by PCem) Amstrad computers. In the meantime the...
by Zup
Mon 20 Aug, 2018 5:15 am
Forum: Patches
Topic: [patch] Systems from the first Olivetti PCS series
Replies: 37
Views: 10126

Re: [patch] Systems from the first Olivetti PCS series

I've got a set of two spanish disk for Olivetti PCS 86. Disk 1 have MS-DOS 3.30, Disk 2 have some MS-DOS files, a tutorial and a diagnostic utility. I had a friend that had a Olivetti PCS33. It came with DOS 5.0, Windows 3.x (I think it was 3.1, but maybe it was 3.0) and a disk compression utility (...
by Zup
Thu 26 Jul, 2018 9:47 pm
Forum: Development
Topic: [Request] Nvidia Riva 128 , TNT, TNT2 ,Matrox video cards
Replies: 7
Views: 2211

Re: [Request] Nvidia Riva 128 , TNT, TNT2 ,Matrox video cards

I wonder if it would be possible to make a "fake" pass-through video card... I mean, a "fake" video card in the sense that it would appear as a physical one; a pass-through in the sense that any DirectX / OpenGL call would be passed to the OS. It would require to write code inside PCem and drivers f...
by Zup
Wed 25 Jul, 2018 5:37 am
Forum: Development
Topic: My requests for PCem v15
Replies: 7
Views: 2681

Re: My requests for PCem v15

Commit this revision, please. Three methods to get your wishes granted: - Put a zero in that request (i.e.: PCem v150) and maybe in that revision all your request are fullfilled. - Pay programmers to do the work. - Make your own changes to the code so it support those items. Other means may not gua...
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: 981

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: 1534

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: 1534

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: 70
Views: 17284

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: 4258

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: 2056

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: 2056

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: 944

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: 35326

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: 2152

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: 2152

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: 2152

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: 3313

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: 7
Views: 6097

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.