Xerox 820 family almost complete

From: Don Maslin <donm_at_cts.com>
Date: Wed Feb 24 14:38:47 1999

On Wed, 24 Feb 1999, Joe wrote:

> At 10:45 PM 2/23/99 -0800, George wrote:
>
> >Is there still a source for 5.25 inch CP/M for the Xerox 820?
> >
>
> Will the CPM for the 803 or one of the other models work on the 820?
> Does anyone know what the capability is between the various Televiedo models?
 
No, and for a variety of reasons, Joe. First. the 820 can only read single
density disks and the TeleVideo disks are all double density. Even the
DD 820-II disk uses a single density first track, so it would choke too.
Second, the Xerox 820 disks read all of the first side before even
venturing into the second side, whereas, the TeleVideo machines read the
tracks on both sides of the disk before moving the heads to the nexr
track. Third, there are other format differences also. Different number
of sectors per track, different skew, ...

As to the Televideo disks, most of the machines can read/write another
models disks. However, there is much less commonality between CP/M
operating systems used. A few will interchange, others will not.

                                                 - don
 
Received on Wed Feb 24 1999 - 14:38:47 GMT