Search found 1350 matches

by robcfg
Wed Jun 16, 2021 7:36 pm
Forum: Dragon General
Topic: Project 2
Replies: 29
Views: 5755

Re: Project 2

One physical game for me, please! :mrgreen:
by robcfg
Tue Jun 15, 2021 12:41 pm
Forum: Uploads
Topic: AGD converted games - BIGPACKs v2.6
Replies: 7
Views: 3357

Re: AGD converted games - BIGPACKs v2.6

My point is that if you only take the bitmap memory, you don’t get a good image because you can have one color as foreground color on one tile and as background color on the next one, creating the ‘negative squares’ problem. As I said, it should be easy to create a more consistent result by translat...
by robcfg
Tue Jun 15, 2021 10:55 am
Forum: Uploads
Topic: AGD converted games - BIGPACKs v2.6
Replies: 7
Views: 3357

Re: AGD converted games - BIGPACKs v2.6

But that generates the problem he’s describing.

It should be easy to do a tool that recreates the original Spectrum image with the right colours, convert it to black and white, and save it.
by robcfg
Mon Jun 14, 2021 4:24 pm
Forum: Uploads
Topic: AGD converted games - BIGPACKs v2.6
Replies: 7
Views: 3357

Re: AGD converted games - BIGPACKs v2.6

I remembered why some tiles appear to negative. The bitmap part indicates where the foreground colour and the background colour go inside every 8x8 tile. But there’s no restriction on what colour is the foreground one or the background one, so without the colour information, the bitmap image can mak...
by robcfg
Mon Jun 14, 2021 6:21 am
Forum: Uploads
Topic: AGD converted games - BIGPACKs v2.6
Replies: 7
Views: 3357

Re: AGD converted games - BIGPACKs v2.6

Sadly it has to be done manually, as I did with the screens of Aeon.

That said, I can help you if you like to.
by robcfg
Sat Jun 12, 2021 5:13 pm
Forum: Dragon General
Topic: The Cambridge Dragon Meetup - June 3rd
Replies: 53
Views: 35854

Re: The Cambridge Dragon Meetup - June 3rd

Not that I remember, but we can ask Phill (aka Prime) here.
by robcfg
Sat Jun 12, 2021 8:39 am
Forum: Dragon Hardware
Topic: RACE Electronics Peripherals
Replies: 28
Views: 9196

Re: RACE Electronics Peripherals

So did anyone here get the Sideways ROM cartridge? Looking at the wiki at http://archive.worldofdragon.org/index.php?title=File:RACE_SidewaysROM02.JPG there's a ROM in there that I haven't seen dumped. I uploaded the pictures from an eBay auction, but sadly I don't have it. Otherwise it would have ...
by robcfg
Fri May 28, 2021 9:40 pm
Forum: Dragon Hardware
Topic: Dragon expansions - FF00 page ports
Replies: 8
Views: 358

Re: Dragon expansions - FF00 page ports

The Dragon's claw seems to map 16 registers starting at a location selectable with a wire link.

The start address can be $FF80, $FF90, $FFA0 or $FFB0.

Image
by robcfg
Fri May 28, 2021 9:36 pm
Forum: Dragon Hardware
Topic: Dragon expansions - FF00 page ports
Replies: 8
Views: 358

Re: Dragon expansions - FF00 page ports

The Touchmaster tablet uses $FF5C to $FF5F.

Image
by robcfg
Fri May 28, 2021 9:32 pm
Forum: Dragon Hardware
Topic: Dragon expansions - FF00 page ports
Replies: 8
Views: 358

Re: Dragon expansions - FF00 page ports

The speech synthesizer by J.C.B. Microsystems exposes a PIA data and control registers at $FF42 and $FF43.

Manual here.