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computers / comp.sys.apple2 / Formatting CP/AM partitions on a CF card

SubjectAuthor
* Formatting CP/AM partitions on a CF cardA2CPM
+* Re: Formatting CP/AM partitions on a CF cardI am Rob
|`- Re: Formatting CP/AM partitions on a CF cardA2CPM
`- Re: Formatting CP/AM partitions on a CF cardSteven Hirsch

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Formatting CP/AM partitions on a CF card

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Subject: Formatting CP/AM partitions on a CF card
From: a2...@wilserv.com (A2CPM)
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 by: A2CPM - Thu, 21 Jul 2022 09:14 UTC

I have a CP/AM 3.5 inch boot disk that displays a drive map when booting on a Platinum IIe The two 3.5 inch drives show as drives A: and B:. The two 5.25 inch drives show as drives C: and D:. The two partitions on a 64 MB compact flash card show up as drives E: and F:. The compact flash card is accessed via a SCSI flash card reader/writer connected to an Apple SCSI controller card. There are CP/AM programs for formatting 5.25 and 3.5 inch disks. I can find nothing in the CP/AM 5.1 docs about formatting "hard drive" partitions. As I compose this message it occurs to me that it might be possible to use the 3.5 inch disk formatting program with resulting huge loss in space but that program wants the target disk in drive A:. Ideas, anyone?

Re: Formatting CP/AM partitions on a CF card

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Subject: Re: Formatting CP/AM partitions on a CF card
From: gids...@sasktel.net (I am Rob)
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 by: I am Rob - Thu, 21 Jul 2022 20:06 UTC

On Thursday, July 21, 2022 at 3:14:18 AM UTC-6, A2CPM wrote:
> Ideas, anyone?

The first question is how did you create the partitions for E: and F: to begin with?

I no longer have my Z80+ card, so can't quite remember the details, but I think the hard drive partitions were created on the ProDos side. The CPM disk came with two formatting options for the floppies. FORMAT.COM for 5.25 disks and FDISK.COM for 3.5 disks.

Re: Formatting CP/AM partitions on a CF card

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 by: Steven Hirsch - Thu, 21 Jul 2022 20:56 UTC

On 7/21/22 05:14, A2CPM wrote:
> I have a CP/AM 3.5 inch boot disk that displays a drive map when booting on
> a Platinum IIe The two 3.5 inch drives show as drives A: and B:. The two
> 5.25 inch drives show as drives C: and D:. The two partitions on a 64 MB
> compact flash card show up as drives E: and F:. The compact flash card is
> accessed via a SCSI flash card reader/writer connected to an Apple SCSI
> controller card. There are CP/AM programs for formatting 5.25 and 3.5 inch
> disks. I can find nothing in the CP/AM 5.1 docs about formatting "hard
> drive" partitions. As I compose this message it occurs to me that it might
> be possible to use the 3.5 inch disk formatting program with resulting huge
> loss in space but that program wants the target disk in drive A:. Ideas,
> anyone?

Wow, it's been a long time (I wrote the CP/AM 5.x BIOS and many of the
utilities). The BIOS should automatically recognize SmartPort devices, but I
don't know if the Apple SCSI card looks like one in firmware. If you've used
the Apple ProDOS utilities to partition the CF card there's no low-level
format required. The challenge is how to create a CP/M directory structure
that CP/AM understands. There was a Sider driver, so buried somewhere
(probably in that driver) is a means to detect the size of the volume and
configure the disk parameter information for it.

Wish I had more concrete input to offer, but that stuff was written over 35
years ago and I have forgotten many of the specifics.

Re: Formatting CP/AM partitions on a CF card

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Subject: Re: Formatting CP/AM partitions on a CF card
From: a2...@wilserv.com (A2CPM)
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 by: A2CPM - Fri, 22 Jul 2022 06:13 UTC

On Thursday, July 21, 2022 at 4:06:12 PM UTC-4, gid...@sasktel.net wrote:
> On Thursday, July 21, 2022 at 3:14:18 AM UTC-6, A2CPM wrote:
> > Ideas, anyone?
> The first question is how did you create the partitions for E: and F: to begin with?
<--- snip --->

Chinook SCSI Utilities. That program is capable of the physical formatting of a CF card but it's usually not needed. CSU writes what is needed by ProDOS after you specify the number of partitions and their sizes. After booting CP/AM the O/S will allow accessing the partitions as drives E: and F: but not properly. For example, attempting to copy a file to either drive gets an error message about insufficient directory entries. That's 'cuz, while the partition/drive can be physically read from or written to, a CP/M directory structure is not present. The yaze Z80 emulator package has a program for creating images of large partitions. Maybe if I play with that program I can transfer enough valid information from the yaze image to my CF card to allow CP/AM to play nice with it.

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