Search found 201 matches

by tzok
Sun Sep 27, 2020 8:09 pm
Forum: ELECTRONICS
Topic: Soldering iron recommendations
Replies: 8
Views: 125

Re: Soldering iron recommendations

I also vote for KSGER T12 or similar Quicko T12-952, but basically anything with a direct heating (tip and heater are integrated) would be a good choice.
by tzok
Sat Sep 26, 2020 10:27 pm
Forum: HARDWARE ISSUES
Topic: 520STFM: After replacing memory: White screen of death.
Replies: 31
Views: 298

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

I rather think, there was a short under the socket... was it original "funky" socket, a modified modern one, or a modern one on the adapter board?
by tzok
Sat Sep 26, 2020 5:47 pm
Forum: HARDWARE ISSUES
Topic: 520STFM: After replacing memory: White screen of death.
Replies: 31
Views: 298

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: 298

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: 298

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: 298

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: 298

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: 298

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: 284

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: 11136

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.

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