Search found 209 matches

by tzok
Sat Sep 26, 2020 5:47 pm
Forum: HARDWARE ISSUES
Topic: 520STFM: After replacing memory: White screen of death.
Replies: 31
Views: 785

Re: 520STFM: After replacing memory: White screen of death.

On the other machine, which only has 512K of memory, it doesn't generate /CASH1 or /CASL1, which means these at least have to be turned on by something. I'm guessing that there's a similar mechanism for bank 0. One of the first things ST does after powering up is determining the memory configuratio...
by tzok
Sat Sep 26, 2020 1:49 pm
Forum: HARDWARE ISSUES
Topic: 520STFM: After replacing memory: White screen of death.
Replies: 31
Views: 785

Re: 520STFM: After replacing memory: White screen of death.

RAS and CAS lines are controlled by MMU itself. Even if it is not selected, it should issue a DRAM refresh cycles.
by tzok
Sat Sep 26, 2020 1:33 pm
Forum: HARDWARE ISSUES
Topic: 520STFM: After replacing memory: White screen of death.
Replies: 31
Views: 785

Re: 520STFM: After replacing memory: White screen of death.

Do you have a logic analyzer? Have you checked if any address/data line is not stuck low or high?
by tzok
Sat Sep 26, 2020 12:48 pm
Forum: HARDWARE ISSUES
Topic: 520STFM: After replacing memory: White screen of death.
Replies: 31
Views: 785

Re: 520STFM: After replacing memory: White screen of death.

If I reckon correctly /BERR is active low, so if you have it "mostly low", you constantly have the Bus Error. Does It pulse high only for a short while after the /RESET goes from low to high (/RESET is also active low)?
by tzok
Sat Sep 26, 2020 11:27 am
Forum: HARDWARE ISSUES
Topic: 520STFM: After replacing memory: White screen of death.
Replies: 31
Views: 785

Re: 520STFM: After replacing memory: White screen of death.

Have you thoroughly probed the MMU and Shifter sockets for continuity between its contacts and the board? Removing and inserting the "snap-on" MMU adapter could easily damage the MMU socket. It is important to verify the continuity between the MMU pins, and the back side of the board (not the socket...
by tzok
Sat Sep 26, 2020 10:25 am
Forum: HARDWARE ISSUES
Topic: 520STFM: After replacing memory: White screen of death.
Replies: 31
Views: 785

Re: 520STFM: After replacing memory: White screen of death.

I desoldered the existing memory, added the three resistors (and also replaced the reset switch and added the blitter socket). That's why I always recommend doing one step at a time, and check if the computer still works. So, the next phase will be bringing down my other STFM and borrowing the MMU ...
by tzok
Wed Sep 23, 2020 10:43 am
Forum: CHAT FORUM
Topic: Calling out to all Fusion 360 masters!
Replies: 15
Views: 483

Re: Calling out to all Fusion 360 masters!

There is no single best way to do it, but I'd construct an offset plane above the top face of the key, and create a sphere in the center of that plane, and then, use it to cut the top face of a key.
by tzok
Tue Sep 15, 2020 7:41 pm
Forum: Terriblefire's channel
Topic: End of all TF (Amiga) projects
Replies: 173
Views: 16664

Re: End of all TF (Amiga) projects

JackTheKnife wrote:
Tue Sep 15, 2020 2:58 pm
Yeah - is there any fork of it? Got few board from OSVG and never thought that project will disappear from the github :(
Yes, TF328, TF330, TF530, and TF534 repositories have been forked, and forks are still available. Binaries are on the TF's official GitHub.
by tzok
Tue Sep 15, 2020 2:11 pm
Forum: Terriblefire's channel
Topic: End of all TF (Amiga) projects
Replies: 173
Views: 16664

Re: End of all TF (Amiga) projects

I had a very similar discussion on a Polish Atari scene... it was about another guy. What he did, was only sharing not his own Gerbers on PCBWay+ Shared Projects. Yet all the projects were available on their authors' sites for free. I actually didn't see anything wrong, he didn't claim the authorshi...
by tzok
Sun Aug 30, 2020 8:11 pm
Forum: MEMBER BLOGS
Topic: AtariFox STFM service blog
Replies: 66
Views: 3803

Re: AtariFox STFM service blog

Ouch, looks like that big CAP on the PSU is about to go POP! I may assure you that it is completely fine! The plastic insert on the top has that hemispherical shape. I had the same, decided to replace it. But when removed, it measured perfectly fine (ESR, leakage, and capacity). I have removed the ...

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