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devel / comp.os.cpm / Re: Dimension 68000 CP/M-86 diskdef

SubjectAuthor
* Dimension 68000 CP/M-86 diskdefSteven Hirsch
+* Dimension 68000 CP/M-86 diskdefBill Shen
|`- Dimension 68000 CP/M-86 diskdefSteven Hirsch
`* Dimension 68000 CP/M-86 diskdefMartin
 `* Dimension 68000 CP/M-86 diskdefSteven Hirsch
  `- Dimension 68000 CP/M-86 diskdefMartin

1
Dimension 68000 CP/M-86 diskdef

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Subject: Dimension 68000 CP/M-86 diskdef
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 by: Steven Hirsch - Fri, 2 Sep 2022 13:33 UTC

In case anyone runs across one of these oddball machines:

diskdef dim68k-cpm86
seclen 512
tracks 40
sectrk 20
blocksize 2048
maxdir 64
skew 1
boottrk 1
end

Re: Dimension 68000 CP/M-86 diskdef

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Subject: Re: Dimension 68000 CP/M-86 diskdef
From: coinstronics@gmail.com (Bill Shen)
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 by: Bill Shen - Sun, 4 Sep 2022 02:26 UTC

Should the topic title be:
"Dimension 68000 CP/M-68K diskdef"?

Re: Dimension 68000 CP/M-86 diskdef

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 by: Steven Hirsch - Mon, 5 Sep 2022 13:14 UTC

On 9/3/22 22:26, Bill Shen wrote:
> Should the topic title be:
> "Dimension 68000 CP/M-68K diskdef"?

They use the same diskette layout for generic (non-Kaypro) CP/M-80, CP/M-86
and CP/M-68k. But, yes, it might have flowed better that way :-).

Re: Dimension 68000 CP/M-86 diskdef

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From: this.is.usenet@so.its.invalid (Martin)
Newsgroups: comp.os.cpm
Subject: Re: Dimension 68000 CP/M-86 diskdef
Date: Mon, 05 Sep 2022 17:48:47 +0200
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 by: Martin - Mon, 5 Sep 2022 15:48 UTC

Am 09/02/2022 03:33 PM, Steven Hirsch schrieb:
> In case anyone runs across one of these oddball machines:
>
> diskdef dim68k-cpm86
> seclen 512
> tracks 40
> sectrk 20
> blocksize 2048
> maxdir 64
> skew 1
> boottrk 1
> end
>

I also analysed the format, while repairing
the corrupted trisoft archive.

I used the diskdefs to extract the FORTRAN files
from the imaged in Dunfield's collection "dimen68k.zip".

They were RELOCated binaries, I used them to verify
the correctness of my work.

But beware, depending on the CP/M Version,
they used two different formats!

Basically your diskdef is equivalent to the
Version 1.2 definition.

########################################
# Microcraft Dimension 68000
# Version 1.0x: dim68-10
# Version 1.2x: dim68-12

diskdef dim68-10
seclen 512
tracks 80
sectrk 10
blocksize 2048
maxdir 64
skew 0
boottrk 2
# this format wastes half of the directory entry
logicalextents 1
os 2.2
end

diskdef dim68-12
seclen 512
tracks 80
sectrk 10
blocksize 2048
maxdir 64
skew 0
boottrk 2
os 2.2
end

Re: Dimension 68000 CP/M-86 diskdef

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 by: Steven Hirsch - Tue, 6 Sep 2022 13:37 UTC

On 9/5/22 11:48, Martin wrote:

> I also analysed the format, while repairing
> the corrupted trisoft archive.
>
> I used the diskdefs to extract the FORTRAN files
> from the imaged in Dunfield's collection "dimen68k.zip".
>
> They were RELOCated binaries, I used them to verify
> the correctness of my work.
>
>
> But beware, depending on the CP/M Version,
> they used two different formats!
>
> Basically your diskdef is equivalent to the
> Version 1.2 definition.
>

Thanks, Martin. The version 1.0x definition is essentially the same as Kaypro
10 is it not? That would make sense since Kaypro is one of their standard
emulations for the Z80 board.

>
>
> ########################################
> # Microcraft Dimension 68000
> # Version 1.0x: dim68-10
> # Version 1.2x: dim68-12
>
> diskdef dim68-10
>   seclen 512
>   tracks 80
>   sectrk 10
>   blocksize 2048
>   maxdir 64
>   skew 0
>   boottrk 2
>   # this format wastes half of the directory entry
>   logicalextents 1
>   os 2.2
> end
>
> diskdef dim68-12
>   seclen 512
>   tracks 80
>   sectrk 10
>   blocksize 2048
>   maxdir 64
>   skew 0
>   boottrk 2
>   os 2.2
> end
>
>

Re: Dimension 68000 CP/M-86 diskdef

<tf7uj6$10t8$1@gioia.aioe.org>

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From: this.is.usenet@so.its.invalid (Martin)
Newsgroups: comp.os.cpm
Subject: Re: Dimension 68000 CP/M-86 diskdef
Date: Tue, 06 Sep 2022 19:04:53 +0200
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 by: Martin - Tue, 6 Sep 2022 17:04 UTC

Am 09/06/2022 03:37 PM, Steven Hirsch schrieb:
> On 9/5/22 11:48, Martin wrote:
>
>
>> I also analysed the format, while repairing
>> the corrupted trisoft archive.
>>
>> I used the diskdefs to extract the FORTRAN files
>> from the imaged in Dunfield's collection "dimen68k.zip".
>>
>> They were RELOCated binaries, I used them to verify
>> the correctness of my work.
>>
>>
>> But beware, depending on the CP/M Version,
>> they used two different formats!
>>
>> Basically your diskdef is equivalent to the
>> Version 1.2 definition.
>>
>
> Thanks, Martin. The version 1.0x definition is essentially the same as
> Kaypro 10 is it not? That would make sense since Kaypro is one of their
> standard emulations for the Z80 board.
>

Did not notice this coincidence, good to know.

I just couldn't read some of the images from bitsavers,
"EMUL_1.04.IMD" is an example.

Every file with more than one extent had only zeroes in it beginning
with offset 4000h, then continues at offset 8000h, and so on.

Have fun!
Martin

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