Search found 83 matches

by Zup
Mon 12 Apr, 2021 6:32 am
Forum: General
Topic: Cannot format blank floppy disk ?!
Replies: 10
Views: 520

Re: Cannot format blank floppy disk ?!

Maybe you should take a look at the FAQ for very urgent bugs...
by Zup
Thu 08 Apr, 2021 10:16 am
Forum: General
Topic: Emulating an Amstrad PC5286
Replies: 13
Views: 9064

Re: Emulating an Amstrad PC5286

A lot of time ago, Amstrad Plc gave permission to use Sinclair (and I guess Amstrad CPC) but only on emulators (not on real machines like ZX-Uno or clones like Harlequin). I'm sure that somebody commented, but... - I don't know if they gave permission for all of their ROMs/BIOS (including things lik...
by Zup
Sun 04 Apr, 2021 11:55 am
Forum: General
Topic: Clustersize (and other things) ignored by MSDOS?
Replies: 4
Views: 263

Re: Clustersize (and other things) ignored by MSDOS?

I don't think that changing parameters on a filesystem is a wise move, it would lead to a heavily corrupt filesystem (did you try to execute chkdsk after that?). If you change those parameters and then format the filesystem again, MS-DOS will do with their default parameters... so everything will be...
by Zup
Sat 05 Dec, 2020 10:16 am
Forum: General
Topic: Documentation bugs/undocumented things
Replies: 1
Views: 803

Documentation bugs/undocumented things

Hi I've been mining inside PCem.exe (v17) and looking to the README. So far, there are some bugs and other findings. Bugs IBM PC: ibmpc/basicc11.f6, ibmpc/basicc11.f8, ibmpc/basicc11.fa and ibmpc/basicc11.fc are mentioned in the documentation. They are not mentioned in PCem.exe, so I guess it won't ...
by Zup
Sun 15 Nov, 2020 5:20 pm
Forum: General
Topic: Hard drive for the Compaq Deskpro 386
Replies: 4
Views: 1816

Re: Hard drive for the Compaq Deskpro 386

AFAIR, Compaq used ESDI hard drives on their Deskpro computers.

My Deskpro PCem machine uses a WD1007 ESDI controller and a 1024h 8c 17s hard drive (those figures came from the Deskpro datasheets), but in older versions you could use XTIDE BIOS as non-native HDD controller.
by Zup
Sat 31 Oct, 2020 9:19 am
Forum: General
Topic: PCem does not recognize the IBM AT 286 ROM
Replies: 2
Views: 976

Re: PCem does not recognize the IBM AT 286 ROM

The docs are wrong, PCem needs two files called 62x0820.u27 and 62x0821.u47.
by Zup
Tue 29 Sep, 2020 9:41 am
Forum: General
Topic: Personal Deskmate 2 for Tandy 1000hx
Replies: 17
Views: 6950

Re: Personal Deskmate 2 for Tandy 1000hx

There's no such thing as abandonware. Did you miss a word? The sentence should be: There's no such thing as legal abandonware. I like having a term like abandonware to refer to software that is not cared for anymore, but (as you tried to explain) unless the copyright owner releases it as public dom...
by Zup
Sun 26 Jul, 2020 7:29 am
Forum: Development
Topic: documentation rework
Replies: 13
Views: 5284

Re: documentation rework

The is no problem to include the MD5/SHA1, the thing is that there is not just ONE valid file. There are many versions of a same ROM and all should work Should != will. The thing is that PCem programmers check their changes with a set of ROMs. Other ROMs for the same system may be untested and may ...
by Zup
Fri 24 Jul, 2020 2:24 pm
Forum: General
Topic: PCem USB support
Replies: 15
Views: 6107

Re: PCem USB support

Maybe it could be interesting to create "virtual" USB HID or MSD devices. Something like getting keyboard/mouse/joystick input and feed it into that virtual HID device. It would be a way to overcome the axis/buttons limitations of traditional gameport. MSD devices could be emulated using a disk imag...
by Zup
Thu 09 Jul, 2020 2:19 pm
Forum: General
Topic: How to install PCem v16 on Linux
Replies: 24
Views: 9169

Re: How to install PCem v16 on Linux

It's complaining about some opengl development package, so you'll need something like libgl-dev. In Debian, it's a virtual package (provided by libgl1-mesa-dev).
by Zup
Wed 01 Jul, 2020 7:09 am
Forum: General
Topic: Speed timings for emulated hard disks
Replies: 11
Views: 9166

Re: Speed timings for emulated hard disks

Although there were 15000 rpm SCSI disks, I don't think they would be available at Pentium II era. Also, to match speeds settings you'll have to include some of this parameters: - Interleave (very important for MFM and RLL disks). - How many ms takes the head motor to jump from a track to the next. ...
by Zup
Mon 04 May, 2020 5:37 am
Forum: General
Topic: No sound with any OS after buying New PC
Replies: 2
Views: 1734

Re: No sound with any OS after buying New PC

Windows 10 lets you choose volume settings on a per-applications basis. That affects to volume and audio output (i.e.: choosing between internal audio, a PCI souncard or an HDMI output).

So... do you have the right audio output selected with enough volume?
by Zup
Sun 26 Apr, 2020 7:37 am
Forum: General
Topic: Question about copy protection in dos games
Replies: 13
Views: 6075

Re: Question about copy protection in dos games

Interesting story: I bought one of the Forgotten Realms releases on cd. There were 12 games which came with a book I still have. The book was apparently the manual for all the games. After playing one level of one game, the copy protection kicked in and asked me for a certain word on a certain page...
by Zup
Sat 25 Apr, 2020 7:09 am
Forum: General
Topic: Question about copy protection in dos games
Replies: 13
Views: 6075

Re: Question about copy protection in dos games

1) It is what it says. Measures to prevent users from copying games instead of buying.

2) https://www.google.com (or https://duckduckgo.com if you're concerned about privacy).
by Zup
Sun 01 Mar, 2020 9:18 am
Forum: General
Topic: Old Mac OSs on PCEM?
Replies: 7
Views: 5258

Re: Old Mac OSs on PCEM?

AFAIK, MacOS 9 runs on Power PC CPUs and earlier releases on 68000 series. Nothing related to 80x86 CPUs/architecture (except some Macintosh that had a PDS card, like Power Macintosh 6100... but still far away from PCs). The only Macintosh that resembles PC architecture are modern ones, and that CPU...
by Zup
Fri 24 Jan, 2020 3:57 pm
Forum: General
Topic: Autodesk 3DS R4 “SentinelPro must be plugged into parallel port”
Replies: 3
Views: 2530

Re: Autodesk 3DS R4 “SentinelPro must be plugged into parallel port”

Some (more than ten) years ago I used an unofficial DOSBox version patched with LPT passthrough to run a DOS program that needed a dongle. Also, I guess there must be some virtual machines that support LPT passthrough. Even in that case, you'll need a REAL (=NOT USB) parallel port in your computer a...
by Zup
Tue 14 Jan, 2020 5:51 pm
Forum: General
Topic: Need for Speed: Special Edition black screen hang when running installer
Replies: 17
Views: 8959

Re: Need for Speed: Special Edition black screen hang when running installer

Abandonware is still copyright-protected.

Wait until copyright expires (see https://www.copyright.gov/help/faq/faq-duration.html ) or the copyright holder puts in into public domain.
by Zup
Sat 28 Dec, 2019 9:27 am
Forum: General
Topic: Is it possible to boot a guest from usb?
Replies: 15
Views: 12910

Re: Is it possible to boot a guest from usb?

This is probably just my misunderstanding of the hardware. I have an atapi drive from an old laptop and am trying to use it with PCem. I use an atapi ide to usb adaptor to connect it to my laptop. I tried a pentium overdrive mmx 200 bios and looked for a boot from usb option but could not find one....
by Zup
Fri 13 Dec, 2019 6:05 am
Forum: General
Topic: Starting PCem - How to save BIOS settings ?
Replies: 3
Views: 2972

Re: Starting PCem - How to save BIOS settings ?

Do you have write permissions on PCem folders and PCem nvr files?
by Zup
Tue 21 May, 2019 5:16 am
Forum: General
Topic: [OT-ish] fitting Linux distros?
Replies: 8
Views: 7636

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: 9
Views: 11386

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: 11
Views: 9166

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: 4272

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: 6705

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: 5807

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: 6240

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: 3470

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: 7473

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: 7473

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: 157
Views: 158303

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...