archive.worldofdragon.org

It would have required a second Video RAM bank (like on the IBM MGA board) to hold the corresponding character attributes. Good point! It definitely contains data of some kind in maybe 8 or 16 blocks, it's a mystery. Moving onto the video timing, you say that there are (112+1)*8=904 pixels per scan...

Serenarian wrote:As for the way that the N82S147AN is used, I don't know.

Does the Plus board ever produce any colour? I've always assumed it was monochrome, but maybe the PROM contains a palette?

That's a nice document, thanks. It will help me correct some video timing details in MAME. At IC12 there is a N82S147AN PROM, any idea how this is used? It would be nice to see a dump of your IC22 too, to compare with the character set that I'm currently using.

You missed the BBC Teletext version.

tjewell wrote:@pernod70 - I know absolutely nothing about Mame - how would I get an emulation of a DragonPlus system up and running?

Do you still want to try MAME? I don't support a Dragon 32 with Plus board so you won't be able to replicate your setup.

robcfg wrote:Tony, can you try the disk version of Edit+?

It has support for the DragonPlus board, so with a bit of luck everything's working.

I can confirm that disk version works in MAME, use EDIT128 with DragonPlus.

You say you have a Dragon 32 though, always thought the Plus board was for Dragon 64.

Excellent! So it has the same ROMs as the Sony HB-55/HB-75, are there any notable hardware differences from the Sony?

If I try it on MAME178, it starts correctly and allows playing, but joystick is mandatory ... I am stuck! I am not a MAME user, and so I haven't been able to 'activate' or enable the joysticks If anyone could help on that, I will really appreciate it! Joysticks were added to the Dragon machines in ...

From the notes in MAME: Fixed density setting on WD2797, so density of read data is now correctly set as required by OS-9. This was the reason startup script was not being executed as Beta disks have a single density boot track, however the rest of the disk is double density. Booted completely to OS...

I created the images from copies of the real disks made by Richard Harding. They *USED* to work in MESS at the point that I made the images but as normal with MAME / MESS someone in the intervening time has broken the compatibility :( That would've been when the whole floppy system was rewritten ye...