Search found 62 matches

by keli
Mon Nov 27, 2017 1:57 pm
Forum: HARDWARE DISCUSSIONS
Topic: Project: HDMI/DVI out for STFM
Replies: 262
Views: 16895

Re: Project: HDMI/DVI out for STFM

AFAIK there is only the palette register, colour changes AFAIK can't reset anything else full screen demos wouldn't work. Possible resolution changes could trigger a internal reset... but again it also would double up that the shifter doesn't output any data for a while and blanking is active for a...
by keli
Thu Nov 23, 2017 8:36 am
Forum: CHAT FORUM
Topic: How Japanese students multiply
Replies: 4
Views: 476

Re: How Japanese students multiply

Here's a good explanation of how it works: https://tapintoteenminds.com/japanese-multiplication/
by keli
Mon Nov 20, 2017 7:32 pm
Forum: HARDWARE DISCUSSIONS
Topic: D68000 FPGA core ?
Replies: 6
Views: 771

Re: D68000 FPGA core ?

There is also the LGPL licensed TG68 open core. https://opencores.org/project,tg68
by keli
Mon Nov 20, 2017 6:26 pm
Forum: HARDWARE DISCUSSIONS
Topic: MNT VA2000 graphics card in a Mega ST
Replies: 11
Views: 1553

Re: MNT VA2000 graphics card in a Mega ST

Looks interesting! What are the actual specs for the card ? Though assume there will also need to be drivers done for the ST.. It's based on the MiniSpartan6+ and he originally just made an adapter board with just the level converters and sockets for that board. It has later evolved into a board on...
by keli
Mon Nov 20, 2017 5:28 pm
Forum: HARDWARE DISCUSSIONS
Topic: MNT VA2000 graphics card in a Mega ST
Replies: 11
Views: 1553

MNT VA2000 graphics card in a Mega ST

I recently found this open source FPGA graphics card made for the Amiga ZORRO II/III expansion bus . After studying the inner workings of the ZORRO II expansion bus, I noticed it was pretty close to the bare m68000 CPU bus. Feeling brave, I ordered a card from his web shop and now I have a shiny Spa...
by keli
Fri Nov 03, 2017 7:19 am
Forum: HARDWARE DISCUSSIONS
Topic: Project: HDMI/DVI out for STFM
Replies: 262
Views: 16895

Re: Project: HDMI/DVI out for STFM

Then TOS writes the appropriate video mode value directly into the shifter's video mode register without caching it in a RAM variable The value is in fact cached in RAM at 0x00044C (sshiftmd system variable). Some interrupt handler or handlers reads the shifter's video mode register directly and wr...
by keli
Wed Nov 01, 2017 11:43 am
Forum: HARDWARE DISCUSSIONS
Topic: ST SHIFTER operation ?
Replies: 94
Views: 7559

Re: ST SHIFTER operation ?

Hi Exxos, the shifter gets A1-A5 rather than A0-A4, so the odd addresses are already excluded. The shifter does get A1-5 (its just internal bus names which are called 0-4). I think I confused 8bit and 16 here, as each address should be 16bit AFAIK. So I should decode all 32 16bit address lines for ...
by keli
Wed Nov 01, 2017 11:34 am
Forum: HARDWARE DISCUSSIONS
Topic: Project: HDMI/DVI out for STFM
Replies: 262
Views: 16895

Re: Project: HDMI/DVI out for STFM

The biggest obstacle that I'm dealing with right now is instability. In monochrome, the whole system is reasonably stable, but in colour (50Hz in my case) the length of the video frames are not steady - some are shorter, some are longer. I am working off the theory that this is because of noise in ...
by keli
Sat Oct 28, 2017 10:38 am
Forum: HARDWARE DISCUSSIONS
Topic: Project STacy (STaceX, TOS 2.06 & others)
Replies: 74
Views: 7566

Re: Project STacy (STaceX, TOS 2.06 & others)

Do you happen to have a part number/digikey link/etc. for the mega bus connector on that adapter?
by keli
Fri Oct 27, 2017 3:19 pm
Forum: HARDWARE DISCUSSIONS
Topic: MMU clone project
Replies: 3
Views: 474

Re: MMU clone project

I do believe however, that this also includes the GLUE logic as it mentions is like ROM & ACIA etc. so likely a lot of this code isn't even needed.. Though if those addresses are removed, it does not look like the MMU does much of anything at all.. It looks almost deceptively simple. In addition to...