Search found 98 matches

by Smonson
Thu Jun 28, 2018 11:13 am
Forum: SOFTWARE PROGRAMMING & DISCUSSION
Topic: TOS 2.06 improving - task for good C coder
Replies: 15
Views: 879

Re: TOS 2.06 improving - task for good C coder

As said, I'm not good with C. So, you mean that should change something at ASM parts syntax ? Or you mean that not use 68000 ASM at all ? I don't think that it can be done without serious speed problems and lot of time. Early stage - HW init, test, BIOS is done in ASM. Then interrupt handlers, beca...
by Smonson
Thu Jun 28, 2018 9:10 am
Forum: SOFTWARE PROGRAMMING & DISCUSSION
Topic: TOS 2.06 improving - task for good C coder
Replies: 15
Views: 879

Re: TOS 2.06 improving - task for good C coder

If you're going to update the TOS code to make it compatible with modern C compilers, I would like to suggest that you break with the tradition of using the obsolete assembler syntax that necessitates the use of gcc-68k-atari-mint. Standard gcc syntax is way more portable. If you have to build a cus...
by Smonson
Mon Jun 25, 2018 2:48 pm
Forum: HARDWARE DISCUSSIONS
Topic: Project: HDMI/DVI out for STFM
Replies: 97
Views: 8279

Re: Project: HDMI/DVI out for STFM

Yeah if you have cycle accuracy detection of DE and LOAD then you can. The cause of the pixel offset is that the wakestates have different DE-to-LOAD delays. 3,4,5 and 6 cycles respectively for WS2, WS4, WS3 and WS1. I experimented with this and found a correlation. Measuring the latency from DE to...
by Smonson
Sat Jun 23, 2018 10:56 am
Forum: HARDWARE DISCUSSIONS
Topic: Project: HDMI/DVI out for STFM
Replies: 97
Views: 8279

Re: Project: HDMI/DVI out for STFM

Yep, the position shift matters if you want to use fullscreen no-borders mode, because it'll move the image slightly off the screen. It's relative to vsync now, but I think hsync and vsync are both generated from the same counters, so if I understand correctly the image is also moving around relativ...
by Smonson
Sat Jun 23, 2018 9:57 am
Forum: HARDWARE DISCUSSIONS
Topic: Project: HDMI/DVI out for STFM
Replies: 97
Views: 8279

Re: Project: HDMI/DVI out for STFM

New things today and yesterday: Added ESD protection to the DVI port Added connections for switches/jumpers to the PCB Added selectable aspect ratio (switch 1) - toggles between 640x400 and 720x400 with 40-pixel left/right borders (for widescreen TV) Added selectable borders on/off (switch 2) - chan...
by Smonson
Fri Jun 22, 2018 10:11 am
Forum: HARDWARE DISCUSSIONS
Topic: Project: HDMI/DVI out for STFM
Replies: 97
Views: 8279

Re: Project: HDMI/DVI out for STFM

I'm not quite done with the unavoidable side-project that is keeping me from working on this (80% through it), but I had enough time recently to add static electricity protection for the DVI socket and get a run of prototypes made. Just tested that new board tonight and it works fine.
by Smonson
Fri Apr 20, 2018 10:11 am
Forum: HARDWARE DISCUSSIONS
Topic: BLITTER RE-CREATION THOUGHTS
Replies: 29
Views: 2671

Re: BLITTER RE-CREATION THOUGHTS

exxos wrote:
Thu Apr 19, 2018 11:23 am
I went for the cheapest 3.3V one which would work. No use going for a larger more expensive device.
I actually know so little about FPGAs... That's the cheapest one I've ever seen! Well outside silly devices without about 20 LEs that hardly seem worth the effort.
by Smonson
Thu Apr 19, 2018 10:50 am
Forum: HARDWARE DISCUSSIONS
Topic: BLITTER RE-CREATION THOUGHTS
Replies: 29
Views: 2671

Re: BLITTER RE-CREATION THOUGHTS

You couldn't get it to work on the Cyclone-II? The EP2C5s I used for the shifter are only $25 each, and they should have way more LEs and pins than you need, and they're not BGA. Although they are fairly large.
by Smonson
Thu Apr 19, 2018 10:33 am
Forum: STFM
Topic: C103414 - STFM 4 x SMT DRAM
Replies: 7
Views: 342

Re: C103414 - STFM 4 x SMT DRAM

I don't know what those pads are for either, but I can tell you that the left side is connected directly to the data bus. That's where I installed my SIMM socket.

Image
by Smonson
Thu Apr 19, 2018 10:14 am
Forum: STFM
Topic: C103414 - STFM 4 x SMT DRAM
Replies: 7
Views: 342

Re: C103414 - STFM 4 x SMT DRAM

This is the one I've got. Those damn J-leaded chips! :pullhair: