Search found 30 matches

by Arjen42
Sun 19 Jun, 2022 11:15 am
Forum: General
Topic: PCem v18 News (Was v17 Notice)
Replies: 9
Views: 762

Re: PCem v17 Notice

Okay, I found it. I downloaded #140: Commit 6f69f3e. I put the bin files in a separate folder and copied over the config, nvr, and rom files. However this version appears to replace existing machine configuration settings with incorrect values. Including hard drive geometry and floppy drive types. T...
by Arjen42
Sat 18 Jun, 2022 7:10 pm
Forum: General
Topic: PCem v18 News (Was v17 Notice)
Replies: 9
Views: 762

Re: PCem v17 Notice

How can we download dev builds?
by Arjen42
Sun 12 Jun, 2022 4:25 am
Forum: Merged patches
Topic: [Patch] Epson LX-810 Dot-matrix printer WIP code
Replies: 11
Views: 2507

Re: [Patch] Epson LX-810 Dot-matrix printer WIP code

Nice that I could help you with that.

But sorry, I have no idea how to get printing to work.
by Arjen42
Sat 11 Jun, 2022 6:37 pm
Forum: General
Topic: is this a goddamn joke?
Replies: 2
Views: 464

Re: is this a goddamn joke?

It looks like PCem doesn't handle double byte characters in directories and filenames well. The directories that it tries to create should already be present, but if it can't find them it will try to create them. They directories are included in the PCem17Win.zip file. Try moving the PCem17Win folde...
by Arjen42
Mon 06 Jun, 2022 8:13 am
Forum: Merged patches
Topic: [Patch] Epson LX-810 Dot-matrix printer WIP code
Replies: 11
Views: 2507

Re: [Patch] Epson LX-810 Dot-matrix printer WIP code

@ Arjen Thanks so much for the rebase explanation and for your reply. How do I get/find the dev branch and build that patch file in(or is it already in the dev branch you mention ? (Sorry totally new at this :-( ) Denman Ok, assuming you got all the dev tools (MYSYS on Windows) including Git instal...
by Arjen42
Sun 05 Jun, 2022 7:19 am
Forum: Merged patches
Topic: [Patch] Epson LX-810 Dot-matrix printer WIP code
Replies: 11
Views: 2507

Re: [Patch] Epson LX-810 Dot-matrix printer WIP code

To rebase is a Git term for a specific way of merging changes from one branch to another. In the context of the previous post, it means that Michael has added the changes to the dev branch, so if you want to try this out you will have to build PCem from the dev branch. If the changes are good enough...
by Arjen42
Mon 23 May, 2022 8:04 pm
Forum: General
Topic: Recommendation of laptops
Replies: 8
Views: 700

Re: Recommendation of laptops

I recall from the magazines of the day, the Pentium MMX had more 1st level cache (32kB) than the original Pentium (16kB) and other improvements, apart from the new MMX instructions, making it faster. It was said that a Pentium MMX 166 was roughly as fast as an original Pentium 200. I did some quick ...
by Arjen42
Thu 19 May, 2022 10:21 am
Forum: General
Topic: We can have a fixed IP via DHCP
Replies: 1
Views: 243

Re: We can have a fixed IP via DHCP

-MAC adrress That we can have a fixed IP via DHCP Add a line like this to the machine config file: macaddr = 06:00:00:00:00:01 This also allows you to have multiple machines on the network at the same time. Adding this to the configuration manager would be nice, but anyone who understands networkin...
by Arjen42
Sat 14 May, 2022 5:33 pm
Forum: General
Topic: CD-DA / Redbook audio not working in DOS
Replies: 10
Views: 651

Re: CD-DA / Redbook audio not working in DOS

Ok, I guess it matters what kind of experience you're looking for. :D I started in 1987 with a Amstrad PC1512 with two floppy drives and monochrome monitor. Now I can emulate this with a hard drive, the memory expansion, and a color monitor. I don't think PCem actually emulates the speed of the hard...
by Arjen42
Fri 13 May, 2022 1:06 pm
Forum: General
Topic: CD-DA / Redbook audio not working in DOS
Replies: 10
Views: 651

Re: CD-DA / Redbook audio not working in DOS

DrakeEdgewater wrote: Thu 12 May, 2022 3:13 pm Yeah it would be nice if everything was working under one system.
Why would that be? What's wrong with having separate systems for games designed for different operating systems? (When you're emulating anyway.)
by Arjen42
Fri 06 May, 2022 1:49 pm
Forum: General
Topic: Blank screen upon selecting configuration
Replies: 3
Views: 325

Re: Blank screen upon selecting configuration

What's the purpose of the flash.bin files?
by Arjen42
Mon 11 Apr, 2022 5:09 pm
Forum: General
Topic: Future sound card musings
Replies: 41
Views: 15348

Re: Future sound card musings

If the host supports the midi device, you can pass it through the emulated midi out. On the Sound card tab select Sound Blaster AWE 32. Sound Blaster 16 or Aztech Sound Galaxy Pro 16 AB may also work. Then click on the button on the right. In the Device Configuration window select the MIDI out devic...
by Arjen42
Sun 10 Apr, 2022 6:56 pm
Forum: General
Topic: Won’t Load ISO’s
Replies: 12
Views: 3842

Re: Won’t Load ISO’s

@MannyMania You don't need the BIOS to detect CD-ROM unless you need to boot from it. (And I doubt this BIOS supports that.) So it's best to leave the CD-ROM drive and unused drives in the BIOS at None to speed up the boot process on slower machines. You do need to load the CD-ROM driver from config...
by Arjen42
Thu 31 Mar, 2022 3:29 pm
Forum: General
Topic: IBM PS/1 Emulation Issues
Replies: 3
Views: 1135

Re: IBM PS/1 Emulation Issues

Didn't the PS/1 only had an internal 3.5" drive, just like the PS/2? An external 5.25" drive would be optional, and therefor only recognized as the B: drive. If you don't need to boot from 1.2MB 5.25" floppy images, you might as well want to configure it to have a 3.5" 1.44MB A: ...
by Arjen42
Sun 27 Mar, 2022 12:40 pm
Forum: General
Topic: Weird A20-related behaviour (bug?)
Replies: 11
Views: 740

Re: Weird A20-related behaviour (bug?)

I'm not sure if I understand your question correctly. But in the reference "word ptr[8]" it's assumed that DS:8 is meant. DS is the default, per x86 specification. Also, there is a reason why DS: , ES: etc are called "segment overriding prefixes" instead of "segment setting...
by Arjen42
Sat 26 Mar, 2022 9:52 pm
Forum: General
Topic: Weird A20-related behaviour (bug?)
Replies: 11
Views: 740

Re: Weird A20-related behaviour (bug?)

What happens if you change the code to this? Absolutely the same thing, without any differences in behaviour. So how would it know to look for [8] in the data segement, e.g. (0:8), and [108] in the extra segment, e.g. fff0:108, in your original program? What do you mean by running it from COMMAND.C...
by Arjen42
Thu 24 Mar, 2022 3:08 pm
Forum: General
Topic: Weird A20-related behaviour (bug?)
Replies: 11
Views: 740

Re: Weird A20-related behaviour (bug?)

What happens if you change the code to this?

Code: Select all

CS:100	MOV BX,0
	MOV DS,BX
	MOV BX, FFF0
	MOV ES,BX
	DS:
	MOV WORD PTR [8],0
	ES:
	MOV WORD PTR [108],1
	DS:
	CMP WORD PTR [8],0
	JZ 126
	MOV DL,41
	MOV AH,2
	INT 21
CS:126	MOV AH,0
	INT 21
by Arjen42
Thu 24 Mar, 2022 2:21 pm
Forum: General
Topic: Weird A20-related behaviour (bug?)
Replies: 11
Views: 740

Re: Weird A20-related behaviour (bug?)

vbdasc wrote: Thu 24 Mar, 2022 10:49 am Even more baffling is that when I run this little program through DEBUG, it behaves normal and as expected. The weird behaviour is only encountered when I run it from COMMAND.COM.
What do you mean by running it from COMMAND.COM?
by Arjen42
Thu 24 Mar, 2022 1:36 pm
Forum: General
Topic: Can't boot XT from Hard Drive.
Replies: 11
Views: 765

Re: Can't boot XT from Hard Drive.

Nonetheless, even though I've figured a way around the problem, i still would like to know why it won't boot from the 20 MB disk. It reads the data from the 20 MB disk just fine, so the system is "happy enough" with the geometry to read it even though it won't boot from it. I suspect it's...
by Arjen42
Thu 24 Mar, 2022 1:00 pm
Forum: General
Topic: Can't boot XT from Hard Drive.
Replies: 11
Views: 765

Re: Can't boot XT from Hard Drive.

I suspect some of those limits were not always real, it just had to be the largest hard drive size that existed when those operating systems versions came out, I remember MS-DOS 2.something shipped with the Sinclair PC200 did a proper install on another computer with a 40MB Conner CP3044 drive. Ear...
by Arjen42
Wed 23 Mar, 2022 3:39 pm
Forum: General
Topic: Can't boot XT from Hard Drive.
Replies: 11
Views: 765

Re: Can't boot XT from Hard Drive.

I did some more testing with PC-DOS 2.10. Formatting 20 MB works just fine with this version. And I checked Wikipedia, The limit of FAT-12 is 32 MB (with 8kB cluster size) as well.
by Arjen42
Wed 23 Mar, 2022 2:32 pm
Forum: General
Topic: Can't boot XT from Hard Drive.
Replies: 11
Views: 765

Re: Can't boot XT from Hard Drive.

MS-DOS 3.20 max supported partition size is 16 MB. I did some testing, and apparently MS-DOS 3.20 does support partition sizes up to 32 MB. So I guess the 16 MB limit applies to FAT-12 supported in MS-DOS 2.x and the 32 MB limiet applies to FAT-16. The difference between the 16 MB and 32 MB can be ...
by Arjen42
Wed 23 Mar, 2022 2:11 pm
Forum: General
Topic: Can't boot XT from Hard Drive.
Replies: 11
Views: 765

Re: Can't boot XT from Hard Drive.

MS-DOS 3.20 max supported partition size is 16 MB. Also it does not support extended partitions with logical volumes. So you cannot create a D: drive for the remaining disk space. MS-DOS 3.30 max supported partition size is 32 MB and it supports extended partitions with logical volumes. So you can c...
by Arjen42
Fri 11 Mar, 2022 9:24 pm
Forum: General
Topic: Emulating p3 with winxp?
Replies: 10
Views: 1806

Re: Emulating p3 with winxp?

How many games from around 2005 run just fine on Windows 10?
by Arjen42
Sun 06 Mar, 2022 10:29 am
Forum: General
Topic: Emulating p3 with winxp?
Replies: 10
Views: 1806

Re: Emulating p3 with winxp?

What games do you want to play? There might be alternatives.
by Arjen42
Sun 06 Mar, 2022 10:27 am
Forum: General
Topic: CD-ROM drive only partially works - unsure if Win98 or PCem bug
Replies: 12
Views: 1902

Re: CD-ROM drive only partially works - unsure if Win98 or PCem bug

I would recommend setting up different emulated PC's. One for Windows 98 games and one for DOS games. This way you could set the Windows 98 one up without DOS cd-rom and mouse drivers, and let the other one just boot DOS with cd-rom and mouse drivers. Maybe an extra one for the really old DOS games ...
by Arjen42
Thu 03 Feb, 2022 3:49 pm
Forum: General
Topic: Audio Glitches and Awkward Video Speed
Replies: 55
Views: 5483

Re: Audio Glitches and Awkward Video Speed

Difference between emulated machines is closer than one might expect. Think of PCem as an generic PC emulator that has some tweaks to be compatible with different BIOS's.
by Arjen42
Thu 03 Feb, 2022 3:43 pm
Forum: Development
Topic: compile v9 to run on win98
Replies: 9
Views: 1462

Re: compile v9 to run on win98

Yes, of course if you already have Windows 98, you probable won't need to run an emulator that can run Windows 98. But maybe dondiego has special needs to do so. I tried running the Windows binary of PCem v9 on Windows 98 SE. After renaming some dll's (guess something went wrong during extracting) a...
by Arjen42
Wed 26 Jan, 2022 2:48 pm
Forum: General
Topic: PCEM stopped working correctly
Replies: 3
Views: 759

Re: PCEM stopped working correctly

Two beeps means the startup display mode is not set correct in nvram. You will need set this to the correct value Monochrome, Color 40x25, Color 80x25, or EGA/VGA, or Not Installed. However if your screen is not working you cannot do this, so you first have to fix your screen. Most likely the rom fi...
by Arjen42
Sat 12 Jun, 2021 7:23 am
Forum: General
Topic: IBM XT BIOS errors
Replies: 1
Views: 671

Re: IBM XT BIOS errors

I was able to reproduce this with one floppy drive.

Adding a second floppy drive fixed this for me.