Ken Gielow sold his Z80DIS (Z80 disassembler) for CP/M 80 as shareware ($20) 
thru his Butler, PA firm (SLR Systems), until the end of the 1980s.
I left Slippery Rock (just north of Butler) in the summer 1983 (about time of 
Info World, October 24, 1983
Software Review by Steve Mann

Date: Wed, 17 Nov 2021 17:23:06 -0800
From: Stan Sieler <>
To: "General Discussion: On/Off-Topic Posts" <>
Subject: Ken Gielow passed away

Last week, Ken Gielow passed away.  
He was the author of the Z80DIS disassembler, which was both interactive and 
used a form of "artificial intelligence" to cleverly disassemble Z80 code.

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