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oldben
Joined: Mon Oct 07, 2019 2:41 am Posts: 593
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Found some defective parts with the alu. Fixed that now waiting for new parts that I forgot to order or ran out of LSXXX.
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Mon Mar 11, 2024 6:25 am |
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oldben
Joined: Mon Oct 07, 2019 2:41 am Posts: 593
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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.
Attachments:
mio.2.jpg [ 37.76 KiB | Viewed 1161 times ]
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Thu Mar 14, 2024 2:14 am |
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oldben
Joined: Mon Oct 07, 2019 2:41 am Posts: 593
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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.
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Mon Mar 18, 2024 2:51 am |
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oldben
Joined: Mon Oct 07, 2019 2:41 am Posts: 593
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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.
Attachments:
File comment: 5 bit slices and 2 connectors so far
nalu.jpg [ 49.18 KiB | Viewed 1130 times ]
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Sun Mar 24, 2024 2:59 pm |
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DockLazy
Joined: Sun Mar 27, 2022 12:11 am Posts: 40
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You could try bodging in some termination resistors as a temporary fix.
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Mon Mar 25, 2024 10:47 pm |
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oldben
Joined: Mon Oct 07, 2019 2:41 am Posts: 593
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Tried that, still not working.
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Tue Mar 26, 2024 6:52 am |
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oldben
Joined: Mon Oct 07, 2019 2:41 am Posts: 593
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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.
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Wed Mar 27, 2024 6:54 am |
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oldben
Joined: Mon Oct 07, 2019 2:41 am Posts: 593
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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.
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Thu Apr 04, 2024 7:19 am |
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