Hi Bret,
Sorry busy hands.
The driver providing an issue is one called
vide_cdd
According to dectalk documentation ide cdroms made by asser and another
company had challenges too, but the driver listed above presented the
largest challenge.
My units are not that old, but I am using this driver with the hardware
one for my cdrom. I do have other units here, but only that vide_cdd
driver is consistently referenced.
Do you know of a comparative substitute?
Would that substitute have to work with only specific cdrom or dvdrom
drives?
Thanks,
Karen
On Fri, 26 Jan 2024, Bret Johnson via Freedos-user wrote:
Karen:
Do you know which of the two CD-ROM drivers you are having trouble with?
It takes two drivers to install a CD in DOS. One is the hardware-specific driver that may come with the CD
hardware itself, but there are also several of them (like OAKCDROM.SYS) that will work with different
hardware if they are "standard" enough (early CD hardware was not standard at all). The
"output" of this driver is a character device that has a name, and all this driver does is provide
access to the sectors on the disk -- it doesn't actually "understand" what the data is (e.g.,
whether it is a music CD or a data CD or something else).
The second driver is usually MSCDEX, but there are also several clones of MSCDEX (e.g., SHSUCDX and NWCDEX).
That driver "interfaces" with the first driver (you must tell MSCDEX what the name of the first
driver is) and the "output" is a drive letter (a block device instead of a character device) that
DOS can use (like D:) to access the files. Just like with floppies and hard drives where you can have
different kinds of formatting (FAT12, FAT16, FAT32, exFAT, NTFS, HPFS, etc.), you can also have different
kinds of formatting on CDs, DVDs, and BDs. The second driver is the one that needs to "understand"
the different kinds of formatting to be able to turn it into a drive letter.
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