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Author Topic: The Missing 84+ Extra RAM Pages (hardware change)  (Read 60277 times)

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Offline TsukasaZX

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Re: DMCA notice from Nintendo
« Reply #15 on: October 04, 2009, 01:10:53 pm »
I meant KBs accessible by normal means, not KBs total. Whoops.

Anyway, yeah, we aren't sure but with a such a smaller chip, it seems likely to me (but who am I to doubt an integrated circuit by its size?)

[edit] Doesn't it kind of make sense though? The TI-OS doesn't USE the full 128KB of RAM. The only way to do so is to code your own application that does which is a feat that not any average Joe Shmoe can do. Seems logical TI would try to cut back on costs by replacing the TA3 chip with a cheaper and smaller TA1 chip (which could simply only have 64KB of RAM, 48 accessible due to configuration?)
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Offline Builderboy

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Re: DMCA notice from Nintendo
« Reply #16 on: October 04, 2009, 01:20:39 pm »
Hmmm, This is all very interesting...

Unfortunately I can not contribute as of now, because I can't find my calculator! D:
I think i left it in a safe place though, so i should be able to pick it up tomorrow.

EDIZT:  Ninja'ed by Tsukasa :/  Congrats on your first Ninja ;D.  Anyway, I don't know if we are sure the TIOS doesn't use them, some peoplpe theorize that all of it is critical for USB Linking.
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Offline JoeyBelgier

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Re: DMCA notice from Nintendo
« Reply #17 on: October 04, 2009, 01:41:04 pm »
It would be their right to cut down on the RAM
But it would have been their duty to say it too
certainly if you know your calc isn't only being used as a calc anymore <_<
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Offline critor

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Re: DMCA notice from Nintendo
« Reply #18 on: October 04, 2009, 01:47:58 pm »
I want my X-RAM  back!
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Offline calc84maniac

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Re: DMCA notice from Nintendo
« Reply #19 on: October 04, 2009, 02:30:40 pm »
Quote from: Builderboy on October 04, 2009, 01:20:39 pm
Hmmm, This is all very interesting...

Unfortunately I can not contribute as of now, because I can't find my calculator! D:
I think i left it in a safe place though, so i should be able to pick it up tomorrow.

EDIZT:  Ninja'ed by Tsukasa :/  Congrats on your first Ninja ;D.  Anyway, I don't know if we are sure the TIOS doesn't use them, some peoplpe theorize that all of it is critical for USB Linking.

Sure it uses them - just not all 128KB.
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Offline megasasquatch

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Re: DMCA notice from Nintendo
« Reply #20 on: October 04, 2009, 03:41:10 pm »
You said it critor. It'd be nice to have just in case.
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Offline Builderboy

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Re: DMCA notice from Nintendo
« Reply #21 on: October 04, 2009, 05:32:19 pm »
Quote from: calc84maniac on October 04, 2009, 02:30:40 pm
Sure it uses them - just not all 128KB.

I mean we might not be sure that it does or does not use all 128kb.  Even though we can't access them, do we know for sure the TiOS can't?  (then again, we don't know if they still exist!)
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Offline calc84maniac

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Re: DMCA notice from Nintendo
« Reply #22 on: October 04, 2009, 08:45:42 pm »
Quote from: Builderboy on October 04, 2009, 05:32:19 pm
Quote from: calc84maniac on October 04, 2009, 02:30:40 pm
Sure it uses them - just not all 128KB.

I mean we might not be sure that it does or does not use all 128kb.  Even though we can't access them, do we know for sure the TiOS can't?  (then again, we don't know if they still exist!)
Well, given that we know exactly how the TI-OS accesses them and we do so in the same way, it's doubtful that the OS is accessing any more RAM than we are.
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Offline Builderboy

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Re: DMCA notice from Nintendo
« Reply #23 on: October 04, 2009, 10:04:15 pm »
Mmmm, ok.  I'm not an assembly guy, so I wasn't sure.
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Offline DJ Omnimaga

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Re: DMCA notice from Nintendo
« Reply #24 on: October 05, 2009, 04:36:16 pm »
Updated the calc table on the first topic page posted by Critor. Two interesting calcs were added to the list

S-0607H        
K-0308J

Both failed, but... K-??? This means there must have been a 3rd production factory somewhere. I remember back in the 83+ days some were produced in Taiwan instead of China. I wonder if it could still be the case...
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Offline JoeyBelgier

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Re: DMCA notice from Nintendo
« Reply #25 on: October 05, 2009, 04:42:18 pm »
intresting D:
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Offline critor

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Re: DMCA notice from Nintendo
« Reply #26 on: October 05, 2009, 04:47:42 pm »
Quote from: DJ Omnimaga on October 05, 2009, 04:36:16 pm
Updated the calc table on the first topic page posted by Critor. Two interesting calcs were added to the list

S-0607H         
K-0308J

Both failed, but... K-??? This means there must have been a 3rd production factory somewhere. I remember back in the 83+ days some were produced in Taiwan instead of China. I wonder if it could still be the case...

K-0308J failing the test is coherent.
But S-0607H is failing the test too.

So maybe, the new TA1 chip has been included in the last 84+ manufactured by S-factory (H-revision).

We have ne entry between 06/2007 and 03/2008.
Maybe it's the K-factory which did manufacture during that period...


My new hypothesis would be:

You have 128K RAM if the 2nd part of your serial begins by S, and doesn't end by H.

or

You cannot play Game Boy ROMs if the 2nd part of your serial begins by P, or begins by K, or ends by H.


More entries during 04/2007-03/2008 will surely make things clearer.
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Offline DJ Omnimaga

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Re: DMCA notice from Nintendo
« Reply #27 on: October 05, 2009, 04:51:24 pm »
True. It is really strange
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Offline calc84maniac

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Re: DMCA notice from Nintendo
« Reply #28 on: October 05, 2009, 04:52:16 pm »
Other than the odd "L" calculator that works (still not sure about that), all data, even the data I collected a while before you started, showed that A-G worked, and H-M didn't.
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Offline DJ Omnimaga

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Re: DMCA notice from Nintendo
« Reply #29 on: October 05, 2009, 05:01:11 pm »
Wasn't the L calc that worked the one when production went back to factory S?  For some reasons, it's missing from the UTI list
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