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Thanks Alastair! The CPU and both ROMs are socketed. It would be very easy to burn a couple of EPROMs with Steve Woolham's D32 enhanced ROM and add those along with a 63B09E CPU to make that into a Super-Dragon.

Its very easy to detect a 6309 processor from machine code, but does anyone know of a way to detect which of the 09, A09, or B09 type CPU's is installed?

munkeyboy wrote:I have over 20 Dragons (most of them from my brother who used to service them, as well as my own from 1983, plus a few from ebay)

Do any of your Dragons have 68B09E (or better) processors fitted?

The following information was copied from the NDUG 64K upgrade document... Finally, thc SAM controls the 'refreshing' of the RAM chips., Dynamic RAM chips have a simple structure of one transistor and capacitor per bit (or cell), and the charge leaks away from the capacitor over a few tens of millis...

I'll need to check the ROMs (which are they) The ROM chips are IC17 and IC18. I'll also see if I can borrow a digital camera so that I can upload some pictures. Thanks! 8-) By the way, it's not the only OKI Issue 2 that cannot take the double speed poke, if the owner of the Dragon 32 with ID 81 at ...

Thanks! :) This picture now shows a Motorola MC6809E processor rather than the Thomson above. Have you got two Dragon 32's with 'Siemens' boards fitted? Edit: Looks like I was wrong about these being the same as the OKI type boards. Still issue 2, but I can see that it has some of the mods that were...

That picture is also a really good example of the OKI RAM configuration. Al a stair, is your RAM configuration like this? Yes, though in my case the OKIs are labelled M3732L-20RS 2Y110. I thought so! :) I'm really surprised that it doesn't run at double speed though. I have four Dragons with these ...

I think these are basically the same as the boards that were fitted with OKI chips. Any chance of a picture of the whole board?

Edit: It would be nice to have good pictures of all four boards.

I don't know for sure, but it was probably done in error. Reg 3 runs quite cool during normal operation in a Dragon.

Fantastic! The 'Siemens' board, with its 8 Siemens HYB-4232 (double 16K) RAM chips. And, a picture of the Thomson EF6809E processor.

Here's the data sheet...