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 Getting it working. 
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Joined: Mon Oct 07, 2019 2:41 am
Posts: 619
Found some defective parts with the alu. Fixed that now waiting for new parts that I forgot to order or ran out of LSXXX.


Mon Mar 11, 2024 6:25 am

Joined: Mon Oct 07, 2019 2:41 am
Posts: 619
Added a quick and dirty INTEL 82C54 timer.
I have gone as far as I want with this proto type setup hardware wise.
3 uarts, and two CF cards and timer chip. Ordered more LSXXX parts, and a different
CF adaptor.
I wanted to add a real time clock interrupt, but I needed to wait a month for parts.
Memory wise, it will be full to the gills, 64 K ram user space and 64K ram O/S space.
Algol ready with recusive procedures and limited bolean logic.
I need a good name for this 24 bit beast still.


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Thu Mar 14, 2024 2:14 am

Joined: Mon Oct 07, 2019 2:41 am
Posts: 619
Going backwards in time. Found a few defective bus drivers, thus I am at the "print the welcome message" and crash after that.
Needed a longer reset to get the Front Panel working. Tomorrow working on busing problems.


Mon Mar 18, 2024 2:51 am

Joined: Mon Oct 07, 2019 2:41 am
Posts: 619
I got more ringing in the clock lines than I expected. Since this requires a complete rebuild to clean up,
I am down sizeing to 20 bits, and rebulding a new computer.


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Sun Mar 24, 2024 2:59 pm

Joined: Sun Mar 27, 2022 12:11 am
Posts: 41
You could try bodging in some termination resistors as a temporary fix.


Mon Mar 25, 2024 10:47 pm

Joined: Mon Oct 07, 2019 2:41 am
Posts: 619
Tried that, still not working.


Tue Mar 26, 2024 6:52 am

Joined: Mon Oct 07, 2019 2:41 am
Posts: 619
May have big design problems, the newer version of chips that I use, have v low max .6 volts for input.
The old chips that have layout problems have V low of .8 volts for input.


Wed Mar 27, 2024 6:54 am

Joined: Mon Oct 07, 2019 2:41 am
Posts: 619
Got in some parts, so now I can try adding some rc flitering on the clock lines.
Still waiting for some schotty diodes, how ever.


Thu Apr 04, 2024 7:19 am
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