---------------------------------------<snip>------------------------------------
Remember how old the 3270 architecture is. Wikipedia says about 1972.
Think 1 Mhz 8080 as "top of the line" micro processor. The original
3277 and its controllers were STUPID. Rather than put a more powerful
processor in the controller, IBM decided to offload the "complicated"
function of calculating the position of the data into the host. Made
of discrete transistors and resistors! Very primitive. So, the host
just sent a simple to understand "buffer address" (a single number)
to the 3274.
Not without a time machine. The 3274 came later. The original 3270
controller lineup was 3271, 3272 and 3275, the latter combining
controller and display.
---------------------------------------<unsnip>-----------------------------------
Wasn't there also a 3276, with a display and controller that would
handle the integerated display, plus 7 more display-only devices?
Rick
----------------------------------------------------------------------
For IBM-MAIN subscribe / signoff / archive access instructions,
send email to lists...@bama.ua.edu with the message: GET IBM-MAIN INFO
Search the archives at http://bama.ua.edu/archives/ibm-main.html
