Dragon Plus from 1985

A place to discuss everything Dragon related that doesn't fall into the other categories.
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jmoore85
Posts: 8
Joined: Thu Aug 28, 2014 5:11 am

Dragon Plus from 1985

Post by jmoore85 »

Fair chance it still works.
DPlus3
DPlus3
IMG_0215.JPG (301.9 KiB) Viewed 3518 times
DPlus2
DPlus2
IMG_0214.JPG (291.03 KiB) Viewed 3518 times
DPlus1
DPlus1
IMG_0213.JPG (304.61 KiB) Viewed 3518 times
tjewell
Posts: 346
Joined: Mon Oct 19, 2009 4:58 pm
Location: Cambridge, England

Re: Dragon Plus from 1985

Post by tjewell »

Oooh! So are you going to take the plunge and switch it on?
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tormod
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Re: Dragon Plus from 1985

Post by tormod »

Cool. What is the thing hiding under the keyboard with the 3 cables going to it? Does the third cable go into the RF modulator or to a separate socket? And the thin, red/yellow twisted cable pair?

What is on top of the rectifiers on the power board, to the left of the power switch?
jmoore85
Posts: 8
Joined: Thu Aug 28, 2014 5:11 am

Re: Dragon Plus from 1985

Post by jmoore85 »

The red led comes on. The relays click on reset/power cycling which is as I remember. The thing under the keyboard is an external switch to select the higher res graphics mode (from memory GO80 or something). Yes the third cable goes to the RF modulator. The twisted pair goes to an LED mounted on the top case above the keyboard. Confirms the board is on. Here's a few more images.

From memory I think the final mod was taking the Printer A port to an external connector. I had some traffic light LEDs and intersections that I programmed as a boy.

So where do I send it to? I have no means of checking the video output - the monitor has long ago been recycled.
Attachments
DPlus board (stitched images)
DPlus board (stitched images)
IMG_9778_stitch.jpg (5.07 MiB) Viewed 3441 times
LED power mod
LED power mod
IMG_9769.JPG (2.15 MiB) Viewed 3441 times
RF
RF
IMG_9767.JPG (2.35 MiB) Viewed 3441 times
Reg
Reg
IMG_9766.JPG (2.19 MiB) Viewed 3441 times
Expansion A (ext)
Expansion A (ext)
IMG_9765.JPG (1.53 MiB) Viewed 3441 times
Expansion A (int)
Expansion A (int)
IMG_9764.JPG (2.53 MiB) Viewed 3441 times
Mode switch
Mode switch
IMG_9762.JPG (2.57 MiB) Viewed 3441 times
Top view
Top view
IMG_9761.JPG (2.52 MiB) Viewed 3441 times
admin
Site Admin
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Joined: Thu Jul 17, 2008 10:22 pm

Re: Dragon Plus from 1985

Post by admin »

I like the switch arrangement for switching between the 80 Column MC6845 (on the Plus board) and the original MC6847 nice touch.
Simon Hardy
jedie
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Re: Dragon Plus from 1985

Post by jedie »

There is a Wiki page about Dragon Plus: http://archive.worldofdragon.org/index. ... ragon_Plus

Maybe, place this pictures there and link the page also here: http://archive.worldofdragon.org/index. ... e_Pictures ?
... too many ideas and too little time ... Related stuff written in Python:
Dragon 32 emulator / PyDC - Python Dragon 32 converter: https://github.com/jedie/DragonPy
DWLOAD server / Dragon-Lib and other stuff: https://github.com/6809
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