Search found 5968 matches

by exxos
Mon Sep 10, 2018 12:49 pm
Forum: HARDWARE DISCUSSIONS
Topic: BLITTER RE-CREATION THOUGHTS
Replies: 171
Views: 17726

Re: BLITTER RE-CREATION THOUGHTS

Spending today routing this board... Buffers on top of the board (red layer) and FPGA on bottom (blue layer). c1.JPG Top route highlighted. d1.JPG Bottom route highlighted. d2.JPG So routing should be doable, albeit very time consuming.. I still need to add the 3.3V regulator and JTAG header, but al...
by exxos
Mon Sep 10, 2018 10:56 am
Forum: HARDWARE DISCUSSIONS
Topic: Project: HDMI/DVI out for STFM
Replies: 507
Views: 42364

Re: Project: HDMI/DVI out for STFM

Yeah, I agree. It could also be bad grounding since my entire board is powered and grounded through a single pin each in an IC socket, which is probably not the best if it's going to draw hundreds of milliamps of current. The fact that my machine is incredibly stable makes me think that whatever th...
by exxos
Mon Sep 10, 2018 10:34 am
Forum: HARDWARE DISCUSSIONS
Topic: Project: HDMI/DVI out for STFM
Replies: 507
Views: 42364

Re: Project: HDMI/DVI out for STFM

Yeah I have. Although if that was the problem I cannot see how it would always be a reset - should be bombs and corruption. VSYNC issues would also just cause the display to flicker/blank out - not reset. Yeah it should yes, but knowing how screwy these machines are, whos to say the extra load on V...
by exxos
Mon Sep 10, 2018 10:12 am
Forum: HARDWARE DISCUSSIONS
Topic: Project: HDMI/DVI out for STFM
Replies: 507
Views: 42364

Re: Project: HDMI/DVI out for STFM

To eliminate the possibility of power supply issues, could you try running the machine with the stock shifter installed, but with the FPGA board connected to just +5, ground, and vysnc? If possible, from somewhere connected close to the shifter socket. Then it should run through video generation ju...
by exxos
Mon Sep 10, 2018 10:05 am
Forum: STF REMAKE PROJECT
Topic: ALPHA MODIFICATIONS
Replies: 85
Views: 6698

Re: ALPHA MODIFICATIONS

RESET FIX First is the short as found by icky on the reset circuit https://www.exxoshost.co.uk/forum/viewtopic.php?f=19&t=1171#p9633 The red circle shows the resistor shorting out VCC to the highlighted yellow line.. 1.JPG SOLUTION STEP 1: s1.JPG Cut the tracks on the bottom of the pcb where the ye...
by exxos
Sun Sep 09, 2018 11:43 pm
Forum: HARDWARE DISCUSSIONS
Topic: Project: HDMI/DVI out for STFM
Replies: 507
Views: 42364

Re: Project: HDMI/DVI out for STFM

Very odd...

What board exactly are you using ? I can try and find same board here to try out..
by exxos
Sun Sep 09, 2018 10:11 pm
Forum: HARDWARE DISCUSSIONS
Topic: Project: HDMI/DVI out for STFM
Replies: 507
Views: 42364

Re: Project: HDMI/DVI out for STFM

troed wrote:
Sun Sep 09, 2018 10:07 pm
This is on a stock machine - the 520.
Ah, so you have the reset problem with your doubleST AND a stock 520 ?
by exxos
Sun Sep 09, 2018 9:54 pm
Forum: HARDWARE DISCUSSIONS
Topic: Project: HDMI/DVI out for STFM
Replies: 507
Views: 42364

Re: Project: HDMI/DVI out for STFM

So now I'm going to debug this issue on the 520 instead ... I'm still not sure why the ST always resets instead of crashes/bombs etc. I think that's a bit surprising. I can't get anything to show on the video, either on the page or downloading it.. May be a good idea to scope out the clocks and see...
by exxos
Sun Sep 09, 2018 9:35 pm
Forum: STF REMAKE PROJECT
Topic: ALPHA MODIFICATIONS
Replies: 85
Views: 6698

Re: ALPHA MODIFICATIONS

JUMPER PADS links.jpg SJ1 & SJ2 are the 2 solder pads like on the STFM near the blitter. Pads must be shorted when NOT using the blitter, and OPEN when using the blitter. For now I would suggest not fitting the blitter. SJ5 is the clock line for the CPU, this needs to be soldered to allow 8MHz cloc...
by exxos
Sun Sep 09, 2018 9:27 pm
Forum: STF REMAKE PROJECT
Topic: ALPHA MODIFICATIONS
Replies: 85
Views: 6698

ALPHA MODIFICATIONS

Started a new thread for "must do" fixes and mods etc.