Falcon IDE read failing at higher frequencies

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mikro
Posts: 147
Joined: Mon Aug 28, 2017 11:22 pm

Re: Falcon IDE read failing at higher frequencies

Post by mikro » Thu Sep 20, 2018 9:11 am

Petari wrote:
Thu Sep 20, 2018 9:04 am
I don't think that replaced IDEtoSD or SD card, especially the later have some influence in it.
Surely it has - because they are both dead now. ;-) Fortunately I have the same brands of those so I can rule out some incompatibility introduced by new hardware.

Petari
Software Moderator
Software Moderator
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Joined: Tue Nov 28, 2017 1:32 pm

Re: Falcon IDE read failing at higher frequencies

Post by Petari » Thu Sep 20, 2018 11:37 am

mikro wrote:
Thu Sep 20, 2018 9:11 am
Petari wrote:
Thu Sep 20, 2018 9:04 am
I don't think that replaced IDEtoSD or SD card, especially the later have some influence in it.
Surely it has - because they are both dead now. ;-) Fortunately I have the same brands of those so I can rule out some incompatibility introduced by new hardware.
I think that I was clear with my writing - replaced one parts are functionally same as now dead parts - before accident.
There is 2 kind of people: one thinking about moving to Mars after here becomes too bad, the others thinking about how to keep this planet habitable.

mikro
Posts: 147
Joined: Mon Aug 28, 2017 11:22 pm

Re: Falcon IDE read failing at higher frequencies

Post by mikro » Sun Sep 23, 2018 9:06 pm

exxos wrote:
Wed Sep 19, 2018 9:54 pm
You say yourself you are accelerating the CPU, so it will read the IDE bus faster... Assuming you now using a different SD card & adapter, just probably was a fluke combo of hardware which made it work before and not now.
Ladies and gentleman, these are words of wisdom and experience. Exxos was 100% right here.

Maybe you know that the CT2 uses separate IDEIOR/W signals (you literally have to intercept them before going to the hard disk). For some time I had been using my IDE disk the classic way, i.e. just connected to the main board without any interception. The main reason was waiting for the damn SD adaptor while I had everything else (IDE splitter etc) ready so I put that aside and connected the disk with a simple cable.

And yes, it was working well. I didn't have a reason to suspect anything fishy except one strange thing - Lotus III, which I got working, wouldn't always work. I disable the cache, see the intro picture and in 2 of 3 tries failed to load. Couldn't really pinpoint it, sometimes it was ST-Low which needed to be set, sometimes clean boot, sometimes HD Driver's caches lowered - all but deterministic. Everything else was fine so there was no reason to suspect the disk.

Now, when I finally got the SD adaptor, I removed the simple cable + old IDE disk and short circuited the new one. In panic (nothing works!) I removed the 'accelerated' IDE splitter, SD adaptor, SD card and the PSU. And you can guess the rest -- I didn't put the old splitter back and reverted to using the simple cable. Curiously, still using the SD adaptor+card, as I was checking whether they still work etc. And bam, there we go, of course the SD card was much more sensitive to this faster IDE accesses and that was the reason why read was failing. Reinstalling the accelerated IDEIOR/W fixed everything back to normal.

In the end, a rather stupid issue and I'm sure I'd notice earlier if the short circuit hadn't happened but... lesson learned.

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