Search found 593 matches

by troed
Wed Aug 05, 2020 4:47 pm
Forum: MONGREL H4 USER BUILDS
Topic: Troed's H4 build
Replies: 60
Views: 3051

Re: Troed's H4 build

Do you remove the osc from MB and put it on your board and add a 64Mhz as well? Yes - they're routed through the GAL to make sure the other clocks get the right values. The 32MHZ osc on the board goes directly to the Shifter (well, through a resistor, but) so needs to be removed. edit: 5 PCBs now o...
by troed
Wed Aug 05, 2020 3:57 pm
Forum: MONGREL H4 USER BUILDS
Topic: Troed's H4 build
Replies: 60
Views: 3051

Re: Troed's H4 build

exxos wrote:
Wed Aug 05, 2020 12:17 pm
Looking good :thumbup:
Thanks! As you know, making hardware is still quite new to me ;) Post updated with final PCB and my assumptions about what the jumpered clocks are. Will soon go and measure to make sure my assumptions are correct :P

/Troed
by troed
Tue Aug 04, 2020 11:06 pm
Forum: MONGREL H4 USER BUILDS
Topic: Troed's H4 build
Replies: 60
Views: 3051

Re: Troed's H4 build

Something like this. Would sit right on top of the jumper row, so female header downwards for JP6-JP12 and pin header upward for DTACK, PWR, mode switches (S0/S1) etc. (post updated with "final" PCB. Doing some visual sanity checks now then sending away for production) Screenshot from 2020-08-05 16-...
by troed
Mon Aug 03, 2020 10:24 pm
Forum: MONGREL H4 USER BUILDS
Topic: Troed's H4 build
Replies: 60
Views: 3051

Re: Troed's H4 build

With the LA probes rearranged it started booting. I'll make a somewhat casual try getting this to work with a test board but will make and order some PCBs that should hopefully not suffer from signal problems. Basically all I'm after now is to see whether I can replicate wakestate-dependant boot iss...
by troed
Sat Aug 01, 2020 1:43 pm
Forum: MONGREL H4 USER BUILDS
Topic: Troed's H4 build
Replies: 60
Views: 3051

Re: Troed's H4 build

Check the signal on the scope. E.g., if for some reason you have very slow edges, and depending on the threshold voltage setting of your LA, you would see an uneven duty cycle. Agree - but the same code worked fine on 20V8. I can compare the GAL generated 16MHz with the one from the Shifter and the...
by troed
Sat Aug 01, 2020 12:22 pm
Forum: MONGREL H4 USER BUILDS
Topic: Troed's H4 build
Replies: 60
Views: 3051

Re: Troed's H4 build

Hmm. So all development I did on the old STF used Lattice 16V8 and 20V8. The H4 is the first time I've gone with (still Lattice) 22V10 - and now I'm confused. The LA did show a strange duty cycle from the GAL which differs from what the Shifter produces - but it doesn't make sense. Or I'm misunderst...
by troed
Fri Jul 31, 2020 6:52 pm
Forum: HARDWARE ISSUES
Topic: New Falcon a lemon?
Replies: 66
Views: 1187

Re: New Falcon a lemon?

I'm not too impressed with the comments you've gotten from the local expert and the seller. 1) The "riser card" (The Falcon memory module made by exxos) is from 2018 - as it says clearly written on it. 2) Before you opened it it had video, after you said it started going to just black screen 3) A fa...
by troed
Thu Jul 30, 2020 11:05 pm
Forum: MONGREL H4 USER BUILDS
Topic: H4 16mhz modification
Replies: 19
Views: 848

Re: H4 16mhz modification

PaulJ wrote:
Sat Jul 04, 2020 3:32 pm
@troed , out of quriosity what program do you use to create the jed file? The opal programs require dos and dosbox which isn't optimal.. :coffee:
I'm sorry - I completely missed your question before. I use WinCupl, which is working perfectly fine under Wine.

/Troed
by troed
Thu Jul 30, 2020 3:51 pm
Forum: MONGREL H4 USER BUILDS
Topic: Troed's H4 build
Replies: 60
Views: 3051

Re: Troed's H4 build

Yeah that worked out nicely, took out that bodge and brought the two DTACK sides up top :) Been playing with a test board today and have the H4 running off the GAL with 32MHz pass through. Feeding the MMU the 16MHz off the GAL instead of from the Shifter doesn't work though. Will need to use the LA ...
by troed
Wed Jul 29, 2020 11:32 pm
Forum: MONGREL H4 USER BUILDS
Topic: Troed's H4 build
Replies: 60
Views: 3051

Re: Troed's H4 build

Finally getting to try to implement doubleST on the H4. Studying the schematics for the "jumper rows" made for the mod board, they seem to lack the ability to run the Shifter off the GAL clock, as well as DTACK_in and DTACK_out (in higher speed modes my results were that DTACK needed delaying from C...

Go to advanced search