Search found 32 matches

by mal.sh
Fri 12 Oct, 2018 2:56 pm
Forum: General
Topic: MS-DOS 1.25 and 2.0 open sourced
Replies: 4
Views: 4429

Re: MS-DOS 1.25 and 2.0 open sourced

Hello. I've just read that Microsoft has published the sources and binaries for MS-DOS versions 1.25 and 2.0. https://github.com/Microsoft/MS-DOS/ It looks like they had published them already some years ago, but opted to publish them again on github for a greater exposure and reference. While they...
by mal.sh
Fri 31 Mar, 2017 2:26 pm
Forum: General
Topic: PC-DOS 1.10 and PCem v12
Replies: 64
Views: 27420

Re: PC-DOS 1.10 and PCem v12

What's surprising there? Formatting without /1 formats both sides, which obviously won't work with an inserted 180k image... It works fine on real hardware. Yet no (or at least almost no) real hardware behaves like these 160K/180K/320K floppy images. So the results you got with PCDOS2 were totally ...
by mal.sh
Thu 30 Mar, 2017 5:45 am
Forum: General
Topic: PC-DOS 1.10 and PCem v12
Replies: 64
Views: 27420

Re: PC-DOS 1.10 and PCem v12

Thanks. But can you tell what exactly are conditions to raise the error "Track 0 bad - disk unusable"? This is one of the places where the division between machine-independent and machine-dependent parts of the code shows up quite clearly. The message comes from the machine-independent part: Man th...
by mal.sh
Thu 30 Mar, 2017 5:41 am
Forum: General
Topic: PC-DOS 1.10 and PCem v12
Replies: 64
Views: 27420

Re: PC-DOS 1.10 and PCem v12

Battler wrote:What's surprising there? Formatting without /1 formats both sides, which obviously won't work with an inserted 180k image...
It works fine on real hardware.
by mal.sh
Wed 29 Mar, 2017 7:33 pm
Forum: General
Topic: PC-DOS 1.10 and PCem v12
Replies: 64
Views: 27420

Re: PC-DOS 1.10 and PCem v12

Well, as I promised I've checked PC-DOS 2.00 FORMAT.COM work with 160/180 KB floppy drives. 1) my configuration was: http://i67.tinypic.com/ak95og.jpg 2) 180 KB PC-DOS 2.0 image file (I downloaded it from here ) was mounted to Drive A . 160 KB image file was mounted to Drive B . 5) When I tried the ...
by mal.sh
Thu 23 Mar, 2017 9:33 am
Forum: General
Topic: PC-DOS 1.10 and PCem v12
Replies: 64
Views: 27420

Re: PC-DOS 1.10 and PCem v12

... Having all this in mind, I think that the most logical thing FORMAT could do to perform this check is as follows: 1. Issue FORMAT TRACK on BOTH sides on cylinder 0; 2. Write something on the (Cylinder 0, Head 0, Sector 1); write something different on (C0, H1, S1); 3. If either write fails, abo...
by mal.sh
Mon 20 Mar, 2017 7:52 pm
Forum: General
Topic: PC-DOS 1.10 and PCem v12
Replies: 64
Views: 27420

Re: PC-DOS 1.10 and PCem v12

If it were as you suggest a 320kb image would always format a disk with both sides yielding 320kb, and that's not the case. First, I don't suggest, I posted solid evidence in the form of an exact FDC command the PC DOS 1.10 FORMAT.COM issues when used with the /1 option, it clearly attempts to form...
by mal.sh
Sun 19 Mar, 2017 2:09 pm
Forum: General
Topic: PC-DOS 1.10 and PCem v12
Replies: 64
Views: 27420

Re: PC-DOS 1.10 and PCem v12

There is no /1 in ver 1.0 because the ONLY disk supported was 160kb 1.10 introduced double sided 320kb and therefore /1 Yes, but Shadower said above that he had IBM-PC DOS 1.00 and used FORMAT command with /1 option. )) I bet it would have worked if you write /1 /64 or whatever Done. I've checked i...
by mal.sh
Sun 19 Mar, 2017 2:03 pm
Forum: General
Topic: PC-DOS 1.10 and PCem v12
Replies: 64
Views: 27420

Re: PC-DOS 1.10 and PCem v12

omarsis81 wrote:There is no /1 in ver 1.0 because the ONLY disk supported was 160kb
1.10 introduced double sided 320kb and therefore /1
Yes, but Shadower said above that he had IBM-PC DOS 1.00 and used FORMAT command with /1 option. ))
by mal.sh
Sun 19 Mar, 2017 1:40 pm
Forum: General
Topic: PC-DOS 1.10 and PCem v12
Replies: 64
Views: 27420

Re: PC-DOS 1.10 and PCem v12

Hi mal.sh: Not so expert here speaking... but like you I am looking for the "perfect" emulator. Just as you did I made a copy of the PC DOS 1.00 original disk image, inserted it in B: and formatted it to 160kB with FORMAT of PC DOS 1.00. Everything worked! Have you tried with 1.00 or only with 1.10...
by mal.sh
Sun 19 Mar, 2017 6:17 am
Forum: General
Topic: PC-DOS 1.10 and PCem v12
Replies: 64
Views: 27420

Re: PC-DOS 1.10 and PCem v12

- omarsis81: Are you sure it does? Have you actually tested on a real IBM PC with the exact same BIOS and a 360 kB floppy drive and an actual 180 kB floppy (ie. one with no second side at all)? Additionally, I've asked my acquaintance from another forum to make extra check on its original IBM PC 51...
by mal.sh
Sun 19 Mar, 2017 6:10 am
Forum: General
Topic: PC-DOS 1.10 and PCem v12
Replies: 64
Views: 27420

Re: PC-DOS 1.10 and PCem v12

Hi mal.sh: Not so expert here speaking... but like you I am looking for the "perfect" emulator. Just as you did I made a copy of the PC DOS 1.00 original disk image, inserted it in B: and formatted it to 160kB with FORMAT of PC DOS 1.00. Everything worked! Have you tried with 1.00 or only with 1.10...
by mal.sh
Fri 17 Mar, 2017 4:43 pm
Forum: General
Topic: PC-DOS 1.10 and PCem v12
Replies: 64
Views: 27420

Re: PC-DOS 1.10 and PCem v12

ibm_pcdos_format.png Well, it seems that it works... Looks like you been using a 160/180 disk on PCem and forcing to format a single side. It works fine if you just use a 320/360 disk and there you specify /1 the single side format. 1) I used an original copy of IBM PC DOS 1.10 which was equipped w...
by mal.sh
Fri 17 Mar, 2017 7:07 am
Forum: General
Topic: PC-DOS 1.10 and PCem v12
Replies: 64
Views: 27420

Re: PC-DOS 1.10 and PCem v12

- mal.sh: PCem v10.1 had less accurate floppy emulation that did not check for the validity of parameters (ie. if they match the currently inserted floppy) at all when formatting. Evidently PC-DOS 1.10 FORMAT.COM does not do something right when formatting the floppy , therefore getting an error in...
by mal.sh
Thu 16 Mar, 2017 7:13 pm
Forum: General
Topic: PC-DOS 1.10 and PCem v12
Replies: 64
Views: 27420

Re: PC-DOS 1.10 and PCem v12

omarsis81 wrote:I hope it gets fixed someday!
But It works very well in PCem v10.1
by mal.sh
Thu 16 Mar, 2017 4:13 pm
Forum: General
Topic: PC-DOS 1.10 and PCem v12
Replies: 64
Views: 27420

Re: PC-DOS 1.10 and PCem v12

omarsis81 wrote:Do you have that option in your IBM DOS?
That should do the trick. If not, what options do you have?
There are only two options of FORMAT command in PC-DOS v1.10: /S and /1

As I said above PC-DOS v1.10 officially supports only 160/320KB 5.25" floppy drives
by mal.sh
Mon 13 Mar, 2017 7:54 pm
Forum: General
Topic: PC-DOS 1.10 and PCem v12
Replies: 64
Views: 27420

Re: PC-DOS 1.10 and PCem v12

Battler wrote:Try FORMAT without /1 then.
Done. I've got the same error:

Image
by mal.sh
Mon 13 Mar, 2017 7:18 pm
Forum: General
Topic: PC-DOS 1.10 and PCem v12
Replies: 64
Views: 27420

Re: PC-DOS 1.10 and PCem v12

I don't know much about the subject of the first IBM PC, but for what I just read on Wikipedia it seems that 160 kb drives and 180 kb drives are the SAME, just that MS DOS could write another sector per track making 160 floppies store 180 kb Quote: "This meant that SSDD disks initially had a format...
by mal.sh
Mon 13 Mar, 2017 7:15 pm
Forum: General
Topic: PC-DOS 1.10 and PCem v12
Replies: 64
Views: 27420

Re: PC-DOS 1.10 and PCem v12

Yes but FORMAT might be trying to format 180 kB by default, which will fail in PCem when a 160 kB image is loaded since the floppy emulation is designed to fail when trying to format with parameters different from those of the inserted image. I've just checked FORMAT in PCem v10.1 . It works. Try a...
by mal.sh
Mon 13 Mar, 2017 5:21 pm
Forum: General
Topic: PC-DOS 1.10 and PCem v12
Replies: 64
Views: 27420

Re: PC-DOS 1.10 and PCem v12

I'm not sure if it helps, but it works with MS-DOS 6.22 As I can see you used 180 KB floppy disk in it, whilst I used an original 160 KB PC-DOS 1.10 floppy image in drive A and its copy in drive B. Originally IBM PC 5150 was equipped with 160 KB 5.25" disk drives (320 KB 5.25" later) , but there ar...
by mal.sh
Mon 13 Mar, 2017 4:24 pm
Forum: General
Topic: PC-DOS 1.10 and PCem v12
Replies: 64
Views: 27420

PC-DOS 1.10 and PCem v12

In my previous topic: PC-DOS 1.10 and PCem v11 - I got errors when I had tried to run the IBM PC with the memory size less than 640 KB. Today I decided to try the new version with IBM PC-DOS 1.10 again. I used the same configuration and I got: 64 KB -> OK 128 KB -> OK 192 KB -> OK 256 KB -> OK 320 K...
by mal.sh
Sun 19 Feb, 2017 5:29 pm
Forum: General
Topic: v12 released!
Replies: 34
Views: 21233

Re: v12 released!

OMG! It's happened!

Many thanks!
by mal.sh
Sat 12 Nov, 2016 9:04 am
Forum: General
Topic: IBM 5150 only boot up with 640KB Ram
Replies: 2
Views: 2189

Re: IBM 5150 only boot up with 640KB Ram

-Scallywag- wrote:Hi.

If I try to boot my IBM PC 5150 setting with less than 640KB PCEM will not boot.
Is this a knwon issue with v11?

Thanks.

Mario
Yes. I've encountered with such issue here: PC-DOS 1.10 and PCem v11
by mal.sh
Fri 19 Aug, 2016 8:54 pm
Forum: General
Topic: PC-DOS 1.10 and PCem v11
Replies: 7
Views: 5078

Re: PC-DOS 1.10 and PCem v11

Looks like there's a bug where the IBM PC won't boot with less than 640kb RAM. I will look into this. With the memory's size range from 64 to 576 KB I got these errors: 64 KB -> 1055 201 128 KB -> 2055 201 192 KB -> 3055 201 256 KB -> 4055 201 320 KB -> 5055 201 384 KB -> 6055 201 448 KB -> 7055 20...
by mal.sh
Tue 16 Aug, 2016 6:08 pm
Forum: General
Topic: PC-DOS 1.10 and PCem v11
Replies: 7
Views: 5078

Re: PC-DOS 1.10 and PCem v11

omarsis81 wrote:According to this thread, the 2055-201 error means DIP switch misconfigured

http://www.vcfed.org/forum/showthread.p ... tion/page3
There's no possibility to change DIP switch configuration(for IBM PC and IBM PC XT) in the current version of PCem.
by mal.sh
Tue 16 Aug, 2016 6:03 pm
Forum: General
Topic: PC-DOS 1.10 and PCem v11
Replies: 7
Views: 5078

Re: PC-DOS 1.10 and PCem v11

SarahWalker wrote:Fixed in rev 540.
Many thanks!

I'm sorry for stupid question, but... where can I get this revision?
by mal.sh
Tue 16 Aug, 2016 5:25 pm
Forum: General
Topic: PC-DOS 1.10 and PCem v11
Replies: 7
Views: 5078

PC-DOS 1.10 and PCem v11

1) PCEm was downloaded and extracted. 2) PC-DOS 1.10 image file was taken from PCjs emulator (or you can take one from Hampa emulator because their PC-DOS 1.10 images are binary identical) . 3) Appropriate files (according to manual from readme.txt) were copied to .\roms\ibmpc directory. 4) The conf...
by mal.sh
Sun 14 Aug, 2016 3:52 pm
Forum: General
Topic: PCjr floppy bug?
Replies: 29
Views: 16157

Re: PCjr floppy bug?

SA1988 wrote:format works too in the IBM PC and IBM XT with 360KB floppy set in the Settings.
Can you share your configuration(pcem.cfg) and PC-DOS 1.10 image file?
by mal.sh
Sun 14 Aug, 2016 7:27 am
Forum: General
Topic: PCjr floppy bug?
Replies: 29
Views: 16157

Re: PCjr floppy bug?

SA1988 wrote:Well, they work for me.
1) What was your configuration?
2) Did you try DISKCOPY, FORMAT or DEL (it didn't work too)?
by mal.sh
Sat 13 Aug, 2016 10:22 pm
Forum: General
Topic: PCjr floppy bug?
Replies: 29
Views: 16157

Re: PCjr floppy bug?

160KB and 320KB are handlled in PCem v11, it's probably the PCjr itself that can't handle the formats, but I don't know. 160 and 320 KB are NOT supported in PCem. At least, they are not listed in the Configure Menu 5.25" 360 KB floppy is listed in the Configure Menu. As I know, one must support 160...