Search found 595 matches

by troed
Tue Apr 03, 2018 3:54 pm
Forum: FPGA DEVELOPMENT
Topic: BLITTER RE-CREATION THOUGHTS
Replies: 290
Views: 51306

Re: BLITTER RE-CREATION THOUGHTS

Really do wonder if anyone out there take code from the MiST or Suska HDL files and adapted so it would work as a standalone replacement blitter IC ? AFAIK the Suska was developed IC for IC, where the VHDL version was always tested drop-in on a regular ST motherboard and so should be 100% pin and s...
by troed
Sun Apr 01, 2018 11:04 pm
Forum: MEMBER BLOGS
Topic: Boosting STFM: 16MHz bus, 64MHz Shifter
Replies: 135
Views: 36246

Re: Boosting STFM: 16MHz bus, 64MHz Shifter

Did I suggest linking the blitter clock to the CPU one ? In effect running the blitter at 16mhz... I mean with 16mhz access to ram you should get a 200% boost on blitting power... Yeah I have a socket and a blitter ready but haven't installed it yet :) Am a bit sidetracked making mods to a 520STM a...
by troed
Fri Mar 30, 2018 8:49 pm
Forum: DISPLAYS & CONVERTERS
Topic: Atari ST Display Basics
Replies: 31
Views: 17606

Re: Atari ST Display Basics

(I've started to doubt what my 520STM does. I'm currently running it on 5V only waiting for a picoPSU to arrive, so it obviously cannot put out 12V .. ) I guess we'll need to find someone with a 260ST to see what they had on pin 8 ;) Now with the picoPSU connected to my 520STM I can verify that it ...
by troed
Fri Mar 30, 2018 4:57 pm
Forum: TWEAKS & FIXES
Topic: Hissing and whistling in the STe audio output
Replies: 122
Views: 23129

Re: Hissing and whistling in the STe audio output

Analyzed a third sound capture from a video that had been uploaded to youtube. The same ~2600Hz peak and harmonics is found there, so I'm beginning to become quite certain that this is indeed the well-known "STE high pitched whine". As to the cause ... well. I don't think it's age related (I remembe...
by troed
Mon Mar 26, 2018 1:51 pm
Forum: MEMBER BLOGS
Topic: Boosting STFM: 16MHz bus, 64MHz Shifter
Replies: 135
Views: 36246

Re: Boosting STFM: 16MHz bus, 64MHz Shifter

So are you running the shifter on 96Mhz to get the MMU at 48MHz ? Or just running the MMU at 48Mhz on its own clock ? Did you get anywhere with the shifter overheating in mono mode ? MMU at 32MHz, Shifter at 48MHz, pulsing DE at a 4/6 duty cycle which will cause them to get back in sync. However, s...
by troed
Sun Mar 25, 2018 10:50 pm
Forum: MEMBER BLOGS
Topic: Boosting STFM: 16MHz bus, 64MHz Shifter
Replies: 135
Views: 36246

Re: Boosting STFM: 16MHz bus, 64MHz Shifter

So the above test was completely wrong, DE didn't get the correct duty cycle. I've rewritten the GAL once again (had to go to a truth table since it became too complicated .. ) and the simulation looks fine now. Will try to find time in the next few days to test it in the real machine (and to patch ...
by troed
Sat Mar 24, 2018 6:35 pm
Forum: MEMBER BLOGS
Topic: Boosting STFM: 16MHz bus, 64MHz Shifter
Replies: 135
Views: 36246

Re: Boosting STFM: 16MHz bus, 64MHz Shifter

Thanks!! I knew there had to be something about the RESET that I overlooked :) A quick fix to still run the GAL, the MMU and CPU clock with RESET only affecting GLUE and MFP brings no improvement. I think it's the MMU and CPU that go into a "deadlock wakeup" on some boots. Will keep pondering. (So ...
by troed
Tue Mar 20, 2018 6:45 am
Forum: MEMBER BLOGS
Topic: Boosting STFM: 16MHz bus, 64MHz Shifter
Replies: 135
Views: 36246

Re: Boosting STFM: 16MHz bus, 64MHz Shifter

So what happens is: - At power on the reset circuit will release the RESET line - The CPU starts executing the TOS - One of the first commands to be executed is "RESET" - Then the CPU will activate the RESET line in order to reset all circuits connected to this line (except the CPU itself) - After ...
by troed
Mon Mar 19, 2018 9:51 pm
Forum: NEWS & ANNOUNCEMENTS
Topic: Lightning VME open Order
Replies: 83
Views: 24639

Re: Lightning VME open Order

I want one for a Mega STE (if there's anything different)
by troed
Sun Mar 18, 2018 10:02 pm
Forum: MEMBER BLOGS
Topic: Boosting STFM: 16MHz bus, 64MHz Shifter
Replies: 135
Views: 36246

Re: Boosting STFM: 16MHz bus, 64MHz Shifter

Where is reset in your code ? I added a simple AND term with RESET on one of the inputs. Since it's an input-only pin, I don't see how it can drive anything low ... (Actually there's an internal pullup so if I don't connect the wire the GAL logic acts as if RESET was high). /* inputs */ PIN 1 = clk...

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