Re: [M100] TPDD2 Data cable pinout?

[Mike Stein]

'Stealing power' (AKA parasitic power) from the control lines is a fairly 
common technique in the RS-232 gadget world:

http://www.epanorama.net/circuits/rspower.html

I think in the case of the TPDD it was used in the LapDos cable to power a 
*real* CMOS TTL<>RS-232 converter IC to connect to the higher voltage levels of 
a PC; the kludge in the M100 cable would not be adequate.

m
  ----- Original Message ----- 
  From: John R. Hogerhuis 
  To: Model 100 Discussion 
  Sent: Thursday, January 14, 2016 12:20 PM
  Subject: Re: [M100] TPDD2 Data cable pinout?


  So do you think that "stealing power from flow control" is just some old BS? 
I wouldn't be surprised.  


  Once you get this all proven out I'd like to publish your analysis and design 
on Bitchin100 wiki with your permission.  

  -- John.