Search found 15 matches

by Eduardo L M
Thu Sep 16, 2021 3:17 am
Forum: TF534 (OBSOLETE)
Topic: A TF534 build in 2021
Replies: 6
Views: 3528

Re: A TF534 build in 2021

I still have to do the PovRay test, I'm having a hard time figuring out how it works. Anyway, I did a very long memory test on ATK. It ran for 75 testing cycles at 50MHz, and I had not a single glitch, with a gold CPU. With a plastic one, I had memory fails, but those don't happen with the gold one....
by Eduardo L M
Thu Sep 09, 2021 3:52 am
Forum: TF534 (OBSOLETE)
Topic: A TF534 build in 2021
Replies: 6
Views: 3528

Re: A TF534 build in 2021

Regarding the 50MHz question, I was wondering.. The period of a 50MHz clock signal is 20ns. And I don't think the CPU ever do memory operations in consecutive clock pulses, they should be at least 2 clocks apart, giving a 40ns time for the memory to work. This is surely less than 55ns, but not much ...
by Eduardo L M
Thu Sep 09, 2021 3:05 am
Forum: TF534 (OBSOLETE)
Topic: A TF534 build in 2021
Replies: 6
Views: 3528

Re: A TF534 build in 2021

Thanks a lot for the replies and povray tip! I'll do the stress test as soon as I can. The flashing is not bothering me too much, but I'll get genuine CPLDs and bus transceiver to see if it makes any difference. @allenppc, indeed, I saw some posts from you stating 50MHz is too much for a TF534, but ...
by Eduardo L M
Mon Aug 30, 2021 1:03 pm
Forum: TF534 (OBSOLETE)
Topic: A TF534 build in 2021
Replies: 6
Views: 3528

A TF534 build in 2021

I'm a little late in the party, but I would like to share my experiences building a TF534 this year. I live in Brazil, and it was very difficult to get some parts (specially SRAMs). It was also hard to reunite all the information needed to do the build, but reading every post in this forum helped a ...
by Eduardo L M
Wed May 26, 2021 10:16 pm
Forum: AMIGA HARDWARE HELP
Topic: Help needed: A600 with black screen
Replies: 15
Views: 7348

Re: Help needed: A600 with black screen

Yes, this is something I'm aware of. But it should not give me a blue screen on boot, right? Well, I think I'll need to do my homework and make some tests on the hardware, with Amiga Test Kit or DiagRom when it arrives. Thanks!

Eduardo
by Eduardo L M
Wed May 26, 2021 10:04 pm
Forum: AMIGA HARDWARE HELP
Topic: Help needed: A600 with black screen
Replies: 15
Views: 7348

Re: Help needed: A600 with black screen

Thanks for the info Supaduper, I didn´t know that! However, my KS 1.3 ROM chip works in another A600 board I have here. Well, at least it boots and shows the hand holding disk image. May it be patched already? Its a NEC chip, not a burned EPROM. Code is 315093-02. However, with this same KS 1.3 ROM ...
by Eduardo L M
Wed May 26, 2021 8:18 pm
Forum: AMIGA HARDWARE HELP
Topic: Help needed: A600 with black screen
Replies: 15
Views: 7348

Re: Help needed: A600 with black screen

Thanks a lot, Supaduper! The CIA has arrived, soldered, and the A600 is back to life, the floppy is working great, many thanks indeed! :D e5047851-de67-458c-ac04-28ba1cb31f5e.jpg But now I'm facing a very strange minor problem: the machine works good with KS 2.05, but fails to boot with KS 1.3. It s...
by Eduardo L M
Fri Apr 23, 2021 11:24 pm
Forum: AMIGA HARDWARE HELP
Topic: Help needed: A600 with black screen
Replies: 15
Views: 7348

Re: Help needed: A600 with black screen

Problem solved!! For the record, I'll explain what was happening: 1) I didn't say because I thought it was not important, but when I recaped the amiga, I removed CXA1145! But studying the schematics, I noticed RGB goes thru it and then to the DB23 connector. So, CXA1145 is not for composite/RF only,...
by Eduardo L M
Thu Apr 22, 2021 10:59 pm
Forum: AMIGA HARDWARE HELP
Topic: Help needed: A600 with black screen
Replies: 15
Views: 7348

Re: Help needed: A600 with black screen

Just to add more info: I had a KS 1.2 in my parts box, so I tried it. The HALT signal remains high after power on! And I get activity on address/data lines. Still black screen, tough. I think it's safe to assume KS 2.x has code that may HALT everything if something goes wrong during early boot stage...
by Eduardo L M
Thu Apr 22, 2021 10:27 pm
Forum: AMIGA HARDWARE HELP
Topic: Help needed: A600 with black screen
Replies: 15
Views: 7348

Re: Help needed: A600 with black screen

Thanks for the tip, I'm waiting a DiagROM to arrive in the mail. And I also ordered an adapter for the programmer so I can burn diagroms by myself! But to make it output to serial port, I'll have to resolder the CIA I removed! Or perhaps put the even CIA in the place of the odd one, since the one I ...

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