Author Topic: T4x asm documentation  (Read 5232 times)

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Offline Munchor

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Re: T4x asm documentation
« Reply #15 on: July 24, 2011, 08:08:06 am »
That screenshot is such a TI fail -.-

Offline thepenguin77

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Re: T4x asm documentation
« Reply #16 on: July 24, 2011, 01:15:34 pm »
Wow, goplat, thank you. That looks like enough information to finish my disassembler. I feel like what you did was a lot easier than calc84 and I's guessing method. :P

Edit:
   Goplat, I need some clarification on some of the opcodes.
  • What is block add?
  • When you shift, what are the arguments?


But other than that, I think I understood the rest.

Edit2:
  Your push/pops are wrong. It should be:
Code: [Select]
111111---22----- 1 -- push regpair[f2*2]

Also, the registers are:
Code: [Select]
4 bit:
f a l h e d p b
000 001 010 011 100 101 110 111

8 bit:
af hl de bp
00 01 10 11

Edit3:
   I'm just going to keep editing until someone responds (as I find new information of course).

7800 and 7C00 also have the same format as push/pop, so in the list they are wrong.

Edit4:
   Based on your system, what would 3EE0 be? I have no idea.
« Last Edit: July 24, 2011, 03:29:53 pm by thepenguin77 »
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Offline Goplat

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Re: T4x asm documentation
« Reply #17 on: July 24, 2011, 03:35:15 pm »
  Goplat, I need some clarification on some of the opcodes.
  • What is block add?
It does multiple add-with-carries in a loop, so you can add multi-nybble numbers easily. Basically:
do {
   adc WRam[H:L], WRam[f3:L]
   inc L
   dec A
} while (A != 0)

Quote
  • When you shift, what are the arguments?
Field 4 specifies the destination register, field 3 the source register, field 2 the shift count minus 1.

Quote
Edit2:
  Your push/pops are wrong. It should be:
Code: [Select]
111111---22----- 1 -- push regpair[f2*2]
Actually the emulator does allow the use of the "high registers" (8-63) in push/pop, and even allows a register pair that starts on an odd-numbered register (although that's probably just a bug)

Quote
Edit4:
   Based on your system, what would 3EE0 be? I have no idea.

Store register 46 to memory. I can't find anything about register 46 though.
« Last Edit: July 24, 2011, 03:41:52 pm by Goplat »
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Offline Art_of_camelot

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Re: T4x asm documentation
« Reply #18 on: July 24, 2011, 03:55:02 pm »
This is pretty cool. I'll be floored if you guys manage to find a way to execute code on these. ;D

Offline ben_g

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Re: T4x asm documentation
« Reply #19 on: July 24, 2011, 04:00:12 pm »
do those calcs actually have a port to send programs to them? You don't have anything abouth programs for that calc when you can't send them to it.
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Offline Art_of_camelot

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Re: T4x asm documentation
« Reply #20 on: July 24, 2011, 04:21:28 pm »
No, they don't have any sort of data port. I don't think any of them have any sort of programability built in either. If I remember correctly they are all scientific calcs.

Offline Goplat

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Re: T4x asm documentation
« Reply #21 on: July 24, 2011, 06:58:30 pm »
List of all the high registers I could find that have special meaning to the emulator:
Code: [Select]
8-9: Stack pointer. Emulator masks off bits 0 and 7 when modified. References memory from 080 to 0FF
10-11: Bit 1: Enable ON key interrupt
Bit 2: Enable timer 1
Bit 3: Enable timer 2
Bit 4: Enable key press interrupt
Bit 5: Enable DMA complete interrupt
12-13: Bits 0-5: Select keypad rows
16-17: Bits 0-7: Bit set when key pressed
22: Bit 1: Set to start LCD update
23: Bit 0: Set to enable DRam bank/address auto-increment or decrement on access to 30-31
Bit 1: If set, DRam bank/address auto-decrements, otherwise auto-increments
24: Bit 0: Allow access to DRam banks 0-D
Bit 1: Allow access to DRam banks E-F
27: DRam bank
28-29: DRam address
30-31: DRam data. Access as a pair to read or write a byte
32-33: Bits 0-7: Key press interrupt column mask
40-41: Bit 0: ON key interrupt active
Bit 1: Timer 1 interrupt active
Bit 2: Timer 2 interrupt active
Bit 3: Key pressed interrupt active
Bit 4: DMA interrupt active
Bit 5: LCD interrupt active
42: Bits 0-1: Timer 1 interval
00 = 350000 TStates
01 = 350000 TStates
02 = 350000 TStates
03 = 350000 TStates (...yes, they're all the same)
Bit 2: Timer 1 interrupt enable
43: Bits 0-1: Timer 2 interval
00 = 6000 TStates
01 = 6000 TStates
02 = 6000 TStates
03 = 6000 TStates (...ditto)
Bit 2: Timer 2 interrupt enable
44: Bit 0: Set to enable timers
47: Bit 0: ON key pressed
Bit 3: Enable interrupt on ON key
48-50: DRam DMA byte count (000-7FF)
51: DRam DMA source bank
52-53: DRam DMA source address
56: DRam DMA bit shift count (0-7)
58: Bit 0: Set to start DMA; cleared when done
Bit 3: Interrupt when complete
59: DRam DMA destination bank
60-61: DRam DMA destination address
« Last Edit: July 24, 2011, 06:58:52 pm by Goplat »
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Offline thepenguin77

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Re: T4x asm documentation
« Reply #22 on: July 25, 2011, 05:41:17 pm »
Here's the disassembler, have fun.
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Offline critor

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Re: T4x asm documentation
« Reply #23 on: August 01, 2011, 07:15:31 am »
Finally thePenguin77, did you find any hidden self test menu/program or something like that in the 5 available ROMs?
« Last Edit: August 01, 2011, 07:15:51 am by critor »
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Offline GinDiamond

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Re: T4x asm documentation
« Reply #24 on: September 24, 2013, 09:07:25 pm »
*bump*

Is there a way to load programs/os's to the flash by means of Arduino and wires?

Offline thepenguin77

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Re: T4x asm documentation
« Reply #25 on: September 25, 2013, 08:50:42 pm »
I just took apart my TI-34 multiview, and although I can't speak for the others, I definitely don't think you can load programs onto this. The circuit board is just a cheap little thing with the processor buried under epoxy. There are only two exposed pieces of copper on the board and they are little circles that are probably just connected to ground. I don't see anywhere on this board where you would be supposed to connect a programmer.

I did find an LED though, if someone could find a way to light that, that would be cool.
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Offline benedikt.muessig

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Re: T4x asm documentation
« Reply #26 on: October 22, 2015, 05:45:10 pm »
I guess no more progress has been made, has it?
Maybe I will look into it too.

Offline Art_of_camelot

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Re: T4x asm documentation
« Reply #27 on: October 22, 2015, 07:20:00 pm »
Yea, doesn't look like. Last post was a couple years ago. Some pretty talented people already took a crack at this, so I'm not sure you'll have much luck either.

Offline benedikt.muessig

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Re: T4x asm documentation
« Reply #28 on: February 29, 2016, 04:40:39 am »
Yea, doesn't look like. Last post was a couple years ago. Some pretty talented people already took a crack at this, so I'm not sure you'll have much luck either.
Idk, maybe it's worth a look. I will see if I can find anything useful.

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Re: T4x asm documentation
« Reply #29 on: February 29, 2016, 09:32:47 pm »
@benedikt.muessig :I seem to remember their being a more definitive answer of no. It might've been in another thread, but I can't seem to find anything at the moment. Maybe @critor or @Goplat remembers. At any rate, if you are able to figure something out, that would be super cool! ^^