Search found 1354 matches

by robcfg
Wed Jun 23, 2021 8:13 pm
Forum: Dragon Hardware
Topic: 6809/6809E compatibility
Replies: 6
Views: 43

Re: 6809/6809E compatibility

I consider it an option!

That it maybe detects an incoming clock signal and disables the internal one.

I've seen weird edge cases with several processors, but having it running without problems for more than 4 years... that would be too much to ask :mrgreen:
by robcfg
Wed Jun 23, 2021 4:59 pm
Forum: Dragon Hardware
Topic: 6809/6809E compatibility
Replies: 6
Views: 43

Re: 6809/6809E compatibility

Hi Stew,

Thanks for the info!

It would have been nice to have it mentioned on the datasheets...

I'll look to get a proper 6309E in order to avoid damaging anything else.

The surprising bit is that it works as if it were a completely compatible replacement.
6309Dragons.jpg
6309Dragons.jpg (156.99 KiB) Viewed 35 times
by robcfg
Wed Jun 23, 2021 3:52 pm
Forum: Dragon Hardware
Topic: 6809/6809E compatibility
Replies: 6
Views: 43

Re: 6809/6809E compatibility

I know that, but my question is more if standard and E versions are interchangeable, and if they are not how come that I have a D64 with a standard 6309 working well.
by robcfg
Wed Jun 23, 2021 1:48 pm
Forum: Dragon Hardware
Topic: 6809/6809E compatibility
Replies: 6
Views: 43

6809/6809E compatibility

Hello, wonderful people! I'd like to ask about the difference between 6809/6309 and 6809E/6309E processors. It looks like the standard and E versions have a set of pins with different functions, and the direction of the E and Q pins seem to be reversed. I upgraded my D200 with a 6309EP, and on the o...
by robcfg
Wed Jun 16, 2021 7:36 pm
Forum: Dragon General
Topic: Project 2
Replies: 29
Views: 5890

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: 3430

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: 3430

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: 3430

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: 3430

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: 36316

Re: The Cambridge Dragon Meetup - June 3rd

Not that I remember, but we can ask Phill (aka Prime) here.