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 [ 3 posts ] 
 Motorola 68000 information for newbies 
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Joined: Mon Feb 03, 2020 4:08 am
Posts: 6
Location: Planet Earth, FL, USA
Over the decades, I always wanted to build some sort of 68K based machine. I've done several 65C02 machines over the past 30+ years and continue to as I've always enjoyed the 6502 and it's later CMOS versions. Back in the 80's I actually purchased a 68000 CPU in CDIP when I was in CA for work... I visited Jameco and found that along with a few other chips to buy. Granted, I still have the 68K, but it's somewhere in the attic, so it's not going to be accessible anytime soon (South Florida heat).

As most would know, the 68K has a flat memory model (vs segmented ala Intel) and is also Big-Endian, unlike Intel and also the 6502 which are Small-Endian. So moving to the 68K can present some additional challenges, when coming from the older 8-bit CPUs and even earlier Intel 16-bit CPUs.

As I spend a fair amount of time researching for information, I stumbled across a series of PDF charts from Wright State University. It was from a course offered some decades ago most likely, but I've found them to be quite informative and in some cases, easier to get your head around working with the 68K, both hardware and software. I'm simply providing the links to these PDFs. If anyone has a desire to learn more or possibly start a project with the 68K, I would recommend them along with the usual Motorola (and later NXP) documentation.

I do plan on designing and building a 68K Pocket SBC based on the ExpressPCB Miniboard format (2.5" x 3.8" 4-layer PCB), but it's going to take some time... as I'm fairly busy with other projects in my newfound retirement. In any case, here's the links to the referenced presentations. I hope someone else find these to be of value as well.

http://research.cs.tamu.edu/prism/lectu ... bsd_l1.pdf
http://research.cs.tamu.edu/prism/lectu ... bsd_l2.pdf
http://research.cs.tamu.edu/prism/lectu ... bsd_l3.pdf
http://research.cs.tamu.edu/prism/lectu ... bsd_l4.pdf
http://research.cs.tamu.edu/prism/lectu ... bsd_l5.pdf
http://research.cs.tamu.edu/prism/lectu ... bsd_l6.pdf
http://research.cs.tamu.edu/prism/lectu ... bsd_l7.pdf
http://research.cs.tamu.edu/prism/lectu ... bsd_l8.pdf
http://research.cs.tamu.edu/prism/lectu ... bsd_l9.pdf
http://research.cs.tamu.edu/prism/lectu ... sd_l10.pdf
http://research.cs.tamu.edu/prism/lectu ... sd_l11.pdf
http://research.cs.tamu.edu/prism/lectu ... sd_l12.pdf
http://research.cs.tamu.edu/prism/lectu ... sd_l13.pdf
http://research.cs.tamu.edu/prism/lectu ... sd_l14.pdf
http://research.cs.tamu.edu/prism/lectu ... sd_l15.pdf
http://research.cs.tamu.edu/prism/lectu ... sd_l16.pdf

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Regards, KM
https://github.com/floobydust


Tue Aug 25, 2020 4:07 am

Joined: Wed Jan 09, 2013 6:54 pm
Posts: 1626
Nice find!


Tue Aug 25, 2020 6:45 am
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Joined: Mon Feb 03, 2020 4:08 am
Posts: 6
Location: Planet Earth, FL, USA
Thanks Ed,

As I'm continuing to learn more about the 68K, I've downloaded a fair amount of info... datasheets and the usual Motorola and NXP documentation. I just found a really large amount of downloadable material at one website. It includes Motorola Datasheets, Motorola Application Notes, a list of Articles and some hardware Board Projects plus the Vu68K hardware and Vu68K VuBUG monitor code from Byte magazine 1984. For anyone interested (in the 68K), this link should be quite valuable:

http://marc.retronik.fr/motorola/68K/68000.html

_________________
Regards, KM
https://github.com/floobydust


Mon Aug 31, 2020 1:54 am
 [ 3 posts ] 

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