Apple I BASIC dump

Chuck Guzis cclist at
Wed Jul 16 16:24:37 CDT 2008

On 16 Jul 2008 at 16:56, Sridhar Ayengar wrote:

> Except I wasn't kidding.  I had an IBM mainframe with only SNA 
> capabilities, and a Honeywell-Bull machine with no network interfaces at 
> all.  I used the lineprinter on the Bull to print, drum-scanned it into 
> an IBM PS/2, then used a Microchannel 3270 emulation card as the main 
> console of the IBM mainframe to transfer the file to the mainframe. 
> Took a while, but worked just fine.

Has anyone used a camera and software to transfer data from a 
system's CRT display?  I've come close to doing that once or twice, 
but never actually tried it.  I found that I could get pretty fine 
program control on a status LED and taped a phototransistor over it 
and sent the data as a serial stream.  It worked better than I'd 
thought it would.


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