Building an OSI 502B CPU Board

Jeff
Posts: 302
Joined: Fri Mar 07, 2014 4:44 am
Location: British Columbia, Canada

Re: Building an OSI 502B CPU Board

Post by Jeff » Thu Apr 04, 2019 6:07 pm

waltermixxx wrote:
Thu Apr 04, 2019 5:35 pm
perhaps I will even out the hole a bit and then3d print a plug or "filling".
That would be really cool.
Image

Jeff
Posts: 302
Joined: Fri Mar 07, 2014 4:44 am
Location: British Columbia, Canada

Re: Building an OSI 502B CPU Board

Post by Jeff » Wed Apr 17, 2019 12:27 am

I have added my 2716 mods and soldered in my 24 pin sockets. I decided to put the jumpers under the sockets, so that things are clean and "more permanent". There were no changes made to the bottom. I still need to add the jumper at W4, but I want to use wire wrap posts, so things can easily be reversed.
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IMG_1295.jpeg (997.06 KiB) Viewed 798 times
/Jeff
Image

waltermixxx
Posts: 114
Joined: Sun Feb 03, 2019 10:31 pm

Re: Building an OSI 502B CPU Board

Post by waltermixxx » Wed Apr 17, 2019 9:06 pm

Looks awesome. I willl be doing a digikey order to continue my board build. Looking forward to seeing your progress.


Cheers.
Turning into quite an OSI Junkie (HTFDTH?) Superboard II REV B-40K, 9600b, HC-05 Bluetooth, Superboard II Rev D, C4P rebuild- 502, 542c, 540B. :)

Jeff
Posts: 302
Joined: Fri Mar 07, 2014 4:44 am
Location: British Columbia, Canada

Re: Building an OSI 502B CPU Board

Post by Jeff » Thu Apr 18, 2019 1:22 am

Completed build (less IC chips)

Top:
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Bottom:
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/Jeff
Image

waltermixxx
Posts: 114
Joined: Sun Feb 03, 2019 10:31 pm

Re: Building an OSI 502B CPU Board

Post by waltermixxx » Thu Apr 18, 2019 8:07 pm

Damn that looks sharp.
what is the mod you did by the serial interface?

:)
Turning into quite an OSI Junkie (HTFDTH?) Superboard II REV B-40K, 9600b, HC-05 Bluetooth, Superboard II Rev D, C4P rebuild- 502, 542c, 540B. :)

Jeff
Posts: 302
Joined: Fri Mar 07, 2014 4:44 am
Location: British Columbia, Canada

Re: Building an OSI 502B CPU Board

Post by Jeff » Thu Apr 18, 2019 10:22 pm

Thanks!

The mod brings TTL level RxData, TxData, +5V and GND to 4 adjacent pins to connect to a USB or WiFi module.

/Jeff
Image

waltermixxx
Posts: 114
Joined: Sun Feb 03, 2019 10:31 pm

Re: Building an OSI 502B CPU Board

Post by waltermixxx » Sat Apr 20, 2019 1:11 pm

Cool, looks like I will be doing the same on mine.

After Steve an I work on the colour interface for the 600 Rev D (mostly Steve), I will continue to work on my 502B and 540B boards.

Looking forward to more progress reports on yours. :0)
Turning into quite an OSI Junkie (HTFDTH?) Superboard II REV B-40K, 9600b, HC-05 Bluetooth, Superboard II Rev D, C4P rebuild- 502, 542c, 540B. :)

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