Heathkit Part 443-843 40 Pin IC

[Bill Coleman]

On Dec 22, 2005, at 6:06 PM, LEON WENDLER wrote:

> They are MC6820 or 6821 it was used with the et3400
> heathkit. use a google search for SC44074PK it is # 3
> on the list

What Motorola called the PIA for Parallel Interface Adapter. Great  
big 40-pin chip that offered 16-bits of binary input / output and  
four additional handshaking lines.


Bill Coleman, AA4LR, PP-ASEL        Mail: aa4lr at arrl.net
Quote: "Not within a thousand years will man ever fly!"
             -- Wilbur Wright, 1901

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