Re: Cassette Capacity

["John B. Matthews" <nospam@nospam.invalid>]

In article 
<f8b45024-498e-403d-9f74-ec7544e97952@v15g2000prn.googlegroups.com>,
 mmphosis <markwstock@yahoo.com> wrote:

> "The typical encoding method for computer data was simple FSK which 
> resulted in typical data rates of 500 to 2000 bit/s, although some 
> games used special faster loading routines, up to around 4000-bit/s. 
> A rate of 2000-bit/s equates to a capacity of around 660 kilobytes 
> per side of a 90-minute tape."
> 
> http://en.wikipedia.org/wiki/Compact_Cassette#Data_recording

More data points: "However, [Apple's cassette interface] ran at 1200 
baud (most microcomputer cassette interfaces in 1976 and 1977 ran at 
only 300 baud) and was more consistently successful at getting a good 
load into memory when compared to other computers of the day."

<http://apple2history.org/history/ah02.html>

"The tape moves at 4.76 cm/s (1 7/8 in/s) from left to right."

<http://en.wikipedia.org/wiki/Compact_Cassette>

I bought a few empty cassette shells and made a series of tapes, each  
~10 minutes long and holding ~90 KB (a few small, related programs).

-- 
John B. Matthews
trashgod at gmail dot com
<http://sites.google.com/site/drjohnbmatthews>