On Fri, 18 May 2018 14:50:20 +0200, Martin wrote:

On 18 May 2018 11:45:26 GMT, Bob Eager wrote:

On Fri, 18 May 2018 12:23:39 +0200, Martin wrote:

On 17 May 2018 17:40:25 GMT, Bob Eager wrote:

On Thu, 17 May 2018 17:16:51 +0000, David wrote:

On Wed, 16 May 2018 20:55:20 +0100, bert wrote:

End of an era
https://www.dropbox.com/s/ot7sw7v9nd...%20Gorton.jpg?
dl=0

Umble.....

ICL System 4/70 with MultiJob. COBOL programmer.
ICL 2970, 2980, 2988.
George 3 under DME on ICL 2960/2966.
Then I turned to the dark side and got involved with IBM PCs.
Then Unix.
Then IBM PC compatibles.

Incomplete as yet, but:

http://www.bobeager.uk/ihaveused.html

Did you also discover that Honeywell DDP 516 interface hardware had
both design and construction faults?

I did more on hacking the CPU than anything else.

I started with a bootstrap loader an assembler and Honeywell diagnostic
programmes that in many cases did nothing. Most of the diagnostics
didn't use interrupts. In most cases the hardware was wrong and either
didn't trigger interrupts or triggered them at the wrong time. I wrote a
simple OS and drivers for most devices before getting on with what I
really wanted to do

This is part of what I did:

http://www.bobeager.uk/anecdotes.html#CPUhack

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