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Author Topic: ASM to arrive on TI-80 ROM 4.0 soon?  (Read 12474 times)

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Offline DJ Omnimaga

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ASM to arrive on TI-80 ROM 4.0 soon?
« on: September 04, 2011, 09:56:59 pm »
Seen in TI-Planet news, it appears that someone has discovered an exploit in TI-80 calculators that run ROM 4.0 that allows the execution of native ASM code. Randy Ruler would be apparently in the process of preparing a ROM dumping program to finish getting the rest of the system code that couldn't be gotten so far and a shell or kernel allowing the execution of ASM programs compatible with Texas Instruments' proprietary 980 KHz processor from the TI-80 and also a TI-80 emulator.

The TI-80 was released in 1995 as a cheaper alternative to the TI-82. It has around 7 KB of RAM, a 64x48 pixels LCD, runs on a 16 bits proprietary 980 KHz processor and doesn't act as normal to gravity as other models. It was discontinued in 2002, replaced by the TI-73.
« Last Edit: September 04, 2011, 10:02:12 pm by DJ_O »
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Offline calc84maniac

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Re: ASM to arrive on TI-80 ROM 4.0 soon?
« Reply #1 on: September 04, 2011, 09:59:02 pm »
Wow 64x48 pixels. Seems pretty interesting. I wonder if there is documentation for that processor somewhere?
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Offline DJ Omnimaga

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Re: ASM to arrive on TI-80 ROM 4.0 soon?
« Reply #2 on: September 04, 2011, 10:02:30 pm »
I'm not sure. I wonder what's the processor at all. Does it even have a name? ??? 
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Offline Camdenmil

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Re: ASM to arrive on TI-80 ROM 4.0 soon?
« Reply #3 on: September 05, 2011, 12:04:32 am »
Hmm, that would mean that all ti graphing calcs can be programmed in asm. I wonder if the the cpu at least similar to a z80. According to datamath  the ti 80's cpu is inside an asic so who knows.
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Offline Michael_Lee

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Re: ASM to arrive on TI-80 ROM 4.0 soon?
« Reply #4 on: September 05, 2011, 12:08:26 am »
Quote from: DJ_O on September 04, 2011, 09:56:59 pm
and doesn't act as normal to gravity as other models.

??? lolwut?

I don't know much about asm, but this sounds pretty interesting.  Hmm, I wonder... What if Axe was ported to every calculator TI ever made? :D
Pretty unlikely though, methinks.
« Last Edit: September 05, 2011, 12:08:59 am by Michael_Lee »
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Offline AngelFish

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Re: ASM to arrive on TI-80 ROM 4.0 soon?
« Reply #5 on: September 05, 2011, 12:48:54 am »
Quote from: DJ_O on September 04, 2011, 09:56:59 pm

The TI-80 was released in 1995 as a cheaper alternative to the TI-82. It has around 7 KB of RAM, a 64x48 pixels LCD, runs on a 16 bits proprietary 980 KHz processor and doesn't act as normal to gravity as other models.

TI invented anti-gravity for the TI-80?
« Last Edit: September 05, 2011, 02:26:04 am by Qwerty.55 »
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Offline JosJuice

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Re: ASM to arrive on TI-80 ROM 4.0 soon?
« Reply #6 on: September 05, 2011, 02:02:36 am »
Quote from: Qwerty.55 on September 05, 2011, 12:48:54 am
Quote from: DJ_O on September 04, 2011, 09:56:59 pm

The TI-80 was released in 1995 as a cheaper alternative to the TI-82. It has around 7 KB of RAM, a 64x48 pixels LCD, runs on a 16 bits proprietary 980 KHz processor and doesn't act as normal to gravity as other models.

lolwut? TI invented anti-gravity for the TI-80?
Maybe they just put a bunch of rocks in it so that it gets heavier? :P
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Re: ASM to arrive on TI-80 ROM 4.0 soon?
« Reply #7 on: September 05, 2011, 09:02:36 am »
Quote from: Michael_Lee on September 05, 2011, 12:08:26 am
Quote from: DJ_O on September 04, 2011, 09:56:59 pm
and doesn't act as normal to gravity as other models.

??? lolwut?

I don't know much about asm, but this sounds pretty interesting.  Hmm, I wonder... What if Axe was ported to every calculator TI ever made? :D
Pretty unlikely though, methinks.

100% unlikely.  Since it doesn't have enough RAM to even hold an early version of Axe, probably doesn't have syscalls remotely similar to the 84+ (the TI80 would have ones only used by the OS, so they would be extremely undocumented and probably not easy to call/use), no flash, *no way to even transfer programs* (no ports for cables whatsoever, and hence no real OS dumps), etc.

So, no most likely Axe won't be ported to this platform :P

Edit: hmm, well, even with ROM dumps, it'll be a while before everything is documented.  But it's a good start towards getting assembly working on the TI80.
« Last Edit: September 05, 2011, 09:04:38 am by Ashbad »
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Offline Camdenmil

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Re: ASM to arrive on TI-80 ROM 4.0 soon?
« Reply #8 on: September 05, 2011, 10:33:32 am »
Just like later versions of the ti 81, the ti 80 has an a spot for soldering a jack. Makes you wonder why ti put the circuitry for a link port and didn't bother putting one on the calcs.
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Re: ASM to arrive on TI-80 ROM 4.0 soon?
« Reply #9 on: September 05, 2011, 11:12:02 am »
Well, this is interesting. Looks like I'll never be able to port Nymless to this thing, though.
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Offline Jim Bauwens

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Re: ASM to arrive on TI-80 ROM 4.0 soon?
« Reply #10 on: September 05, 2011, 03:48:09 pm »
Interesting.
Good job whoever found the exploit :)
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Re: ASM to arrive on TI-80 ROM 4.0 soon?
« Reply #11 on: September 05, 2011, 04:40:07 pm »
I doubt the TI-80 even has the filesystem necessary to support a compiler of any kind, considering the only program that it was ever intended to run is launched by the boot code.
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Offline fb39ca4

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Re: ASM to arrive on TI-80 ROM 4.0 soon?
« Reply #12 on: September 05, 2011, 05:32:40 pm »
Quote from: Michael_Lee on September 05, 2011, 12:08:26 am
Quote from: DJ_O on September 04, 2011, 09:56:59 pm
and doesn't act as normal to gravity as other models.

??? lolwut?

I don't know much about asm, but this sounds pretty interesting.  Hmm, I wonder... What if Axe was ported to every calculator TI ever made? :D
Pretty unlikely though, methinks.
Good luck running it on the TI-108 :P If you are just talking about graphing calculators, though, with the exception of this, it is a possibility if someone decided to do all the work.
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Re: ASM to arrive on TI-80 ROM 4.0 soon?
« Reply #13 on: September 05, 2011, 06:08:50 pm »
Quote from: Camdenmil on September 05, 2011, 10:33:32 am
Just like later versions of the ti 81, the ti 80 has an a spot for soldering a jack. Makes you wonder why ti put the circuitry for a link port and didn't bother putting one on the calcs.
Some 80s shipped with a link port for use with teacher software. Which only had the ability to take screenshots.
« Last Edit: September 05, 2011, 06:10:40 pm by Juju »
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Re: ASM to arrive on TI-80 ROM 4.0 soon?
« Reply #14 on: September 05, 2011, 06:32:35 pm »
Sounds interesting...
How is the instruction set for this CPU?
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