[personal] UK Computer Museum on TV

[Roger Holmes]

> From: "Mike Hatch" <mike at brickfieldspark.org>
>

> Have past experience with Elliott 803b, Digital PDP7 & 11/20,  
> Scientific
> Data Systems SDS9300, ASR/KSR 33 & 35, Ampex TM4 tape drives.

May I ask what machine the Ampex TM4 tape drives were connected to? I  
have them on my ICT 1301s, and I have a slightly different deck  
marked TM4 Leo but if you know of any other machines which used them  
it would be interesting. Do you know if they were always ten track  
read/write heads or were they different configurations? I guess the  
formats were different across different machines, it seems unlikely  
anyone else would have chosen to use 4 data bits and 6 CRC bits, and  
certainly not in multiples of 12 digits with the digits from each  
half of the word interspersed ending at a word of hex FFFFFFFFFFFF.

Roger