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tjewell wrote:So is this like Ed Snider's project, where he's replacing the 6847 with an FGPA emulation of one? Or does your board still use the 6847, but improve the output of it?

Nope still use the 6847, just process it's output.

Cheers.

Phill.

Hi Phill - so what exactly are we looking at here? Apart from the crispest output I've ever seen from a Dragon! Is this something that plugs into the 6847 slot for those lucky peeps that have socketed chips? Yes it plugs into the 6847 socket, and produces TTL RGB. Basically I designed a Colour boar...

Well I was just using pmode 4:screen 1,0 as in the basic program provided...... But I sussed the problem was a dodgy socket pin on GM1, though not sure why it wasn't affecting pmode 3..... But it's working now, I posted some pictures on facebook : https://www.facebook.com/media/set/?set=a.1020582518...

The behaviour kinda seems like GM1 and GM2 aren't getting through - GM0 must be (at least floating) high or you'd see a colour graphics mode. Indeed, and Pmode 3 is working correctly. But you tested... 4.4V seems like enough to register as high to me, so if it's not that, nothing else is coming to ...

Hi all, Now that I have the Acorn Atom Colour board working correctly I thought I'd try and adapt it to work on the Dragon and CoCo, as they all use the 6847. I have adapted the circuit so that only the video output section is used as the RAM is handled on the Dragon motherboard. However I'm getting...

Thank for posting this, Phill! I will at least look at the CAS functionality. I wonder if you are doing some processing of the CAS data on the Dragon-MMC, or if you are hooking into the BASIC "read byte from cassette" routines and just passing byte per byte from the CAS file. IIRC just hooking the ...

The CoCo Speech / Sound is compatible with the Dragon i have one and have used it on my Dragon.

Has an SP0256, a PIC doing text->alophone translation and then feeding the results to the SPO256. Also has an AY-3-8912 3 channel sound chip on there too.

Cheers.

Phill.

I seem to remember Manic Miner Or Jet Set Willy (can't remember which), would check for a cartridge in the $C000 area and erase themselves from memory if they found one. Plus they had the colour blocks protection sheet. I think it was also them that the loader / protection code would pass a value I ...

Hi all, Sorry I haven't been round here much lately...... Anyway, here's the files for DragonMMC as far as it got. DragonMMC 2015-09-01.zip Included is : Eagle board layouts (probably need Eagle V6.x or V7.x). Source project for the CPLD on the board, needs Xilinx Webpack 14.x. AVR GCC (WinAVR), sou...

Hi all, On the original Coco 1, the conversion was never that reliable because of the messy wiring needed to get the EEPROMS wired into the PROM sockets. So I've removed this, the keyboard mod and replaced the original BASIC & Ext BASIC PROMs. This now fires up nicely as an original CoCo. However i...