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by troed
Wed Oct 11, 2017 9:37 pm
Forum: MEMBER BLOGS
Topic: Boosting STFM: 16MHz bus, 64MHz Shifter
Replies: 135
Views: 30570

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

So I'll just leave this here ...
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:twisted: :twisted: :twisted: :twisted: :twisted: :twisted: :twisted: :twisted:
by troed
Wed Oct 11, 2017 5:57 pm
Forum: MEMBER BLOGS
Topic: Boosting STFM: 16MHz bus, 64MHz Shifter
Replies: 135
Views: 30570

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

IMG_20171011_185241.jpg Alright, so a closer inspection of the clock LA shows something that's indeed in the spec sheet for the sync counter - it syncs to the falling edge of the clock pulses. I would guess this might be the reason why there seems to be wait states forced for RAM access - it's at 1...
by troed
Wed Oct 11, 2017 5:08 pm
Forum: MEMBER BLOGS
Topic: Boosting STFM: 16MHz bus, 64MHz Shifter
Replies: 135
Views: 30570

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

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The GB6 version is old, without the new algorithm, and I think it's comparing to a system with blitter which this machine doesn't have. Also slightly difficult to read ;)

Pure genius exxos to suggest the sync binary counter.
by troed
Wed Oct 11, 2017 9:14 am
Forum: 3D MODELS
Topic: STFM case remake
Replies: 198
Views: 40337

Re: STFM case remake

FWIW I have a ~€2000 3D printer and I would not be terribly happy with the output quality for a case. It would need a lot of sanding down to get to an acceptable surface.

I've thought about splitting an STL and printing parts to glue together. Would be a lot of glue.

/Troed
by troed
Mon Oct 09, 2017 2:11 pm
Forum: FLOPPY DRIVES KITS & UPGRADES
Topic: How to get TOS to see the 1.44MB drives
Replies: 22
Views: 5417

Re: How to get TOS to see the 1.44MB drives

exxos wrote:
Mon Oct 09, 2017 1:02 pm
It is also possible that your 1772 may not actually work at 16 MHz... You're welcome to send it to me to testing if it helps..
This is my guess. Is it a VL-model? (That's what my Megas have)

/Troed
by troed
Sun Oct 08, 2017 4:31 pm
Forum: MEMBER BLOGS
Topic: Boosting STFM: 16MHz bus, 64MHz Shifter
Replies: 135
Views: 30570

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

Thanks, will look into dtack.

In the meantime, here are the clocks sampled at CPU, DMA and Floppy. I did a few runs with detection level at 1.0V up to 2.8V to try to figure out if maybe they were weak (still waiting for that scope).
la_cpu_dma_floppy.png
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by troed
Sat Oct 07, 2017 12:38 pm
Forum: MEMBER BLOGS
Topic: Boosting STFM: 16MHz bus, 64MHz Shifter
Replies: 135
Views: 30570

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

A bit of shooting in the dark at the moment, but: 33R added to 8MHz (for GLUE, WD etc) - no change 10k pullup added to DMA databus - no change I can very repeatedly and predictably keep pressing ESC to get more or less correct data read from the disk. Very seldomly (but it happens) the size or filen...
by troed
Fri Oct 06, 2017 6:27 pm
Forum: MEMBER BLOGS
Topic: Boosting STFM: 16MHz bus, 64MHz Shifter
Replies: 135
Views: 30570

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

exxos wrote:
Fri Oct 06, 2017 5:15 pm
I would suggest you get a 74F161 as well.
Now ordered.

:)
by troed
Fri Oct 06, 2017 12:57 pm
Forum: MEMBER BLOGS
Topic: Boosting STFM: 16MHz bus, 64MHz Shifter
Replies: 135
Views: 30570

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

exxos wrote:
Fri Oct 06, 2017 12:45 pm
Add a 1K resistor (pull up) on CPU /DTACK and /AS see if that helps. Also add a sil array on the DMA databus.
Thanks for the suggestions :)

(Also, I just placed an order for a scope ... will arrive in ~three weeks)

/Troed
by troed
Fri Oct 06, 2017 11:08 am
Forum: MEMBER BLOGS
Topic: Boosting STFM: 16MHz bus, 64MHz Shifter
Replies: 135
Views: 30570

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

Pullups changed on address and data bus, no change. Tested with the freshly refurbished Epson 340, no change. However, since I did a bit more testing: The drive seems to have issues reading more than writing/formatting. Most often it will simply believe disks have 0 bytes used in 0 files, but someti...

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