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Author Topic: Mimas by Benjamin Moody  (Read 54205 times)

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Offline qazz42

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Re: Mimas by Benjamin Moody
« Reply #75 on: October 04, 2010, 06:14:15 pm »
Quote from: DJ Omnimaga on October 04, 2010, 05:40:16 pm
We never know. Maybe it could be possible. Not sure, though. Calc84maniac had an hard time converting TI-Boy SE so it runs on newer 84+ calcs.

had? that means he did?

err, back on topic, thats how that RAM recovery worked? I did npot know that.. now, how does the v-calc use the RAM pages?

oh, wait, nvmd...
« Last Edit: October 04, 2010, 06:14:54 pm by qazz42 »
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Offline Deep Toaster

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Re: Mimas by Benjamin Moody
« Reply #76 on: October 04, 2010, 06:25:10 pm »
Quote from: calc84maniac on October 04, 2010, 06:05:18 pm
Well, every backup would require erasing a sector. Things could get even more complicated if there is other data sharing the sector.

Just a quick question: Is the default state (when it's "empty") of any flash space all FFs?
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Offline ztrumpet

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Re: Mimas by Benjamin Moody
« Reply #77 on: October 04, 2010, 06:33:51 pm »
Quote from: Deep Thought on October 04, 2010, 06:25:10 pm
Quote from: calc84maniac on October 04, 2010, 06:05:18 pm
Well, every backup would require erasing a sector. Things could get even more complicated if there is other data sharing the sector.

Just a quick question: Is the default state (when it's "empty") of any flash space all FFs?
I believe that is correct. :)

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Offline calc84maniac

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Re: Mimas by Benjamin Moody
« Reply #78 on: October 04, 2010, 06:43:51 pm »
Quote from: Deep Thought on October 04, 2010, 06:25:10 pm
Quote from: calc84maniac on October 04, 2010, 06:05:18 pm
Well, every backup would require erasing a sector. Things could get even more complicated if there is other data sharing the sector.

Just a quick question: Is the default state (when it's "empty") of any flash space all FFs?
Yes. Also, when writing bytes to flash, you can only change 1 bits to 0, not 0 to 1.
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Offline DJ Omnimaga

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Re: Mimas by Benjamin Moody
« Reply #79 on: October 04, 2010, 08:34:06 pm »
Wait? I am confused what this means ???
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Offline calc84maniac

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Re: Mimas by Benjamin Moody
« Reply #80 on: October 04, 2010, 08:37:39 pm »
When changing single bits in flash, you can only set them to 0 (or leave them as 1). To set bits to 1, you have to set the whole sector to 1 (which is called a sector erase)
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Offline ztrumpet

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Re: Mimas by Benjamin Moody
« Reply #81 on: October 04, 2010, 08:39:00 pm »
Quote from: calc84maniac on October 04, 2010, 08:37:39 pm
When changing single bits in flash, you can only set them to 0 (or leave them as 1). To set bits to 1, you have to set the whole sector to 1 (which is called a sector erase)
This is what Axe is doing that makes compiling Apps take longer. :)
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Offline Builderboy

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Re: Mimas by Benjamin Moody
« Reply #82 on: October 04, 2010, 08:41:56 pm »
Basically with Flash Memory, you can only do 2 things.  Change *every single* bit into a 1, or change one bit from 1 into a 0.  

EDIT: double ninja :P
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Offline DJ Omnimaga

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Re: Mimas by Benjamin Moody
« Reply #83 on: October 04, 2010, 10:32:40 pm »
Quote from: calc84maniac on October 04, 2010, 08:37:39 pm
When changing single bits in flash, you can only set them to 0 (or leave them as 1). To set bits to 1, you have to set the whole sector to 1 (which is called a sector erase)
Wow... that sounds a bit akward to work with x.x
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Offline Builderboy

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Re: Mimas by Benjamin Moody
« Reply #84 on: October 04, 2010, 10:34:13 pm »
Yeah x.x I believe its to work against hacking?  (obviously not as important in calcs, but in Computers it helps to have hardware restrictions on writing im sure)
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Offline calc84maniac

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Re: Mimas by Benjamin Moody
« Reply #85 on: October 04, 2010, 10:38:57 pm »
Nah, it's just how the hardware works.
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Offline Builderboy

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Re: Mimas by Benjamin Moody
« Reply #86 on: October 04, 2010, 10:39:29 pm »
Ah gotcha, well thats lamesauce :P
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Offline thepenguin77

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Re: Mimas by Benjamin Moody
« Reply #87 on: October 04, 2010, 10:59:58 pm »
Quote from: ztrumpet on October 04, 2010, 08:39:00 pm
Quote from: calc84maniac on October 04, 2010, 08:37:39 pm
When changing single bits in flash, you can only set them to 0 (or leave them as 1). To set bits to 1, you have to set the whole sector to 1 (which is called a sector erase)
This is what Axe is doing that makes compiling Apps take longer. :)

Actually making apps is slow because flash is horribly slow. Each flash command takes about the same amount of time I believe. So erasing happens near instantly. But then you have to go rewrite those 65536 bytes you just erased. Which takes about 4 seconds. But not only does it have to write it once, first you have to copy the whole sector to the swapSector, and then copy it back. That's two full sector copies. If you ever wondered why OS mods take so long, this is also why. OS mods usually require erasing more than one sector too :P
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Offline Deep Toaster

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Re: Mimas by Benjamin Moody
« Reply #88 on: October 04, 2010, 11:29:09 pm »
So that's why GarbageCollect is needed...
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Offline DJ Omnimaga

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Re: Mimas by Benjamin Moody
« Reply #89 on: October 04, 2010, 11:49:50 pm »
Darn, if Axe ever supports writing to Flash, I'm sure gonna try to minimize the use of this feature as much as possible. X.x

Good thing flash is not as slow as floppy disks...
« Last Edit: October 04, 2010, 11:50:13 pm by DJ Omnimaga »
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