1st stage loader for IMSAI - need ascii to binary conversion

dwight elvey dkelvey at hotmail.com
Tue Feb 26 21:34:10 CST 2008





> From: cclist at sydex.com
>
> David Griffith wrote:
>
>> This paper tape fiddling made me wonder if anyone ever made a cassette
>> tape interface that emitted RS232 signals and looked to the computer
>> like a paper tape reader/writer.
>
> Definitely. I used a lovely Techtran dual-cassette unit before I had
> a floppy drive for my MITS 8800. Buffered in 128-byte blocks, fully
> searchable and block-addressable. Used as a replacement for an ASR
> tape unit--it understood XON and XOFF control codes. Baud rates to
> 2400, IIRC.
>
> These were fairly common at one time in CNC applications, such as
> embroidery and machining before they were replaced by floppy-disk
> paper tape emulators.
>
> Data was recorded as NRZ rather than FSK, however.
>

Hi
 For the high speed cassette, the Poly88 used manchester encoding.
It is like a pushed to the limit FSK more more correctly phase
encoding.
Dwight

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