Windows 1.0 For DEC Rainbow (mirror of Latrobe ftp anybody ?)

Fred Cisin cisin at
Thu May 4 20:58:10 CDT 2017

On Thu, 4 May 2017, Warner Losh via cctalk wrote:
> The old fashioned way: copy the files on the rainbow to the hard
> drive, kermit to my unix box.
> I have a kryoflux, but it's being nothing but frustrating to me since
> I don't know if I have a known good floppy it supports or not. I mean
> I have two 5.25 1.2M floppy drives, just have no way of knowing if
> they are good or not and am loathe to try to buy another one...  So
> I'm reading them the only way I know how: via an RX-50 on my
> Rainbow...

Rainbow disks are readable on a PC with 1.2M.  But, it's sometimes a 
little easier if you use a 720K 5.25" drive.

96tpi, 300 RPM with 250K data transfer rate
(or, with some 1.2M drives: 360RPM with 300K data transfer rate, but NOT 
double stepping as would be done for 360K disk at that data transfer rate)

There are commercial programs available for the PC to read/write Rainbow,
and even programs for the Rainbow to read/write PC 160K/180K disks.
(for writing PC on the Rainbow, start with a virgin disk, and format it on 
the Rainbow in PC format, or in a PC using a 1.2M drive in 190K format 
-same track width problems as rewriting 360K disks in 1.2M drive)

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