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Another Dragon version???
Posted: Sun Nov 03, 2013 12:06 am
by pser1
Hello,
I have bought lately a Dragon32 that has the four seals on.
Despite that, one of them is so loose, that I can force a bit the case and open it enough to have a peek on the contents and ...
I have clearly seen that the place that must be occupied by the SAM has ... a daugther board in its place with a great chip (the SAM of course) and another chip, a little one, who knows what it does there?
Have you ever heard of something like that?
Keeping into account that guarantee is by far finished, I could open it and take some photos if needed
best regrads
Pere
Re: Another Dragon version???
Posted: Sun Nov 03, 2013 12:14 am
by robcfg
Hi Pere!
Check the pictures
here.
It may be a Dragon Plus board. If not, please take some pictures as it may be some undocumented hardware.
Regards,
Rob
Re: Another Dragon version???
Posted: Sun Nov 03, 2013 12:28 am
by pser1
Hello,
Of course it is not a Dragon Pus board.
I can promise it then many years ago I had one of these Dragon-Plus boards, that unfortunately is not longer with me
I will try in the next days to open my last Dragon and take some photos so you can see the strange daughter board.
I would take a photo of the seals before, because I have never opened it!
speek soon
Pere
Re: Another Dragon version???
Posted: Sun Nov 03, 2013 12:57 am
by zephyr
Re: Another Dragon version???
Posted: Sun Nov 03, 2013 1:04 am
by pser1
I cannot tell
Tomorrow, if I have the time, I will open the computer (breaking the seals) and have some photos that I will upload
Hope we could have finally an idea why Dragon data did this strange mod od the dragon
speak soon
Pere
Re: Another Dragon version???
Posted: Sun Nov 03, 2013 1:16 am
by robcfg
Pere, you can use some lighter fuel (gasolina de mechero) on the seals, to loosen them without breaking them. When they are dry, they will stick again to the surface.
Re: Another Dragon version???
Posted: Sun Nov 03, 2013 1:23 am
by pser1
hello,
thanks a lot my friend!
I will try to open my Dragon them withouf breaking them, but if it is necessary, I won't mind, the gaurantee is void since a lot of time!!
I don't want to sell that computer, so I will open it wheter it helps whether it doesn't help
Hopefully romorrow we could be talking about hose pictures
have a nice week-end
Buen fin de semana!!
Pere
Re: Another Dragon version???
Posted: Mon Nov 04, 2013 10:30 pm
by admin
Something like this?
http://www.ebay.co.uk/itm/Dragon-32-Com ... true&rt=nc
Not sure it should be labelled as RARE - it may be an factory fix or option - Its either a factory fault/fix to allow use of a motherboard with issues or its possible adding lowecase (like the 200-E) if thats the 6847 on the daughterboard.
Re: Another Dragon version???
Posted: Mon Nov 04, 2013 11:04 pm
by pser1
sorry, I have not been able to do anything whith that 'rare' dragon32.
And YES!, not only the images are the same thing a could see openening a bit that computer, but this is the same seller who sold me that D32 version.
I hope to be able to open it along this week.
I will see what is on the daughter board and will tell you
regards
pere
Re: Another Dragon version???
Posted: Tue Nov 05, 2013 6:27 pm
by pser1
finally opened the computer.
It has a power supply ISSue 4 and the motherboard is MKII Issue 6
The great chips on the motherboard are: MC6809P, SC6847P and 2x6821P
Don't know ifthis minds, the ROM chips are:
IC17 - 9364C-0032 47123 GI8310 in a socket
IC18 - 9364C-0031 47211 GI8317 soldered on the mainboard
Then on the daughterboard sit these ICs:
IC1 - SN74LS32N it's a Quad 2-Input OR Gate
IC2 - SN74LS74AN it's a Dual D-Type Flip Flop
IC3 - SN74LS783N, one of the std SAM
The daughterboard has this part number: PN48200 Issue 2
If I have misse danything or you need more info, just let me know, the case is not yet closed
I try to add some photos
- motherboard with the daughterboard unsocketed
- P1030292.JPG (3.55 MiB) Viewed 5303 times
- upside of the daughterboard with the ICs
- P1030294.JPG (2.93 MiB) Viewed 5303 times
- backside of the daughterboard
- P1030295.JPG (2.81 MiB) Viewed 5303 times
- The daughterboard in its socket
- P1030297.JPG (3.22 MiB) Viewed 5303 times
- Three resistors added on the component side
- P1030299.JPG (3.22 MiB) Viewed 5303 times
- Another view of these components
- P1030310.JPG (3.02 MiB) Viewed 5303 times