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Z80 & 68k Assembly =>
z80 & ez80 Assembly
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Galandros
Active Member
Joined: 29 Aug 2008
Posts: 565
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 Posted: 21 Oct 2009 01:04:28 pm Post subject: |
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Is it possible to build a rom file with asm code that you want to use on a emulator and run your code without the TI-OS?
Example:
Code:
#include "buildrom.asm"
#define PRGM
;#define APPS
;put your code here:
your_code:
#include "mygame.asm"
#include "fillrom.asm"
.end
You define PRGM when the code starts at userMem and APPS for $4000.
The APPS needs the pages positioning, jump over the header, etc..
Assemblers like spasm can output to a .bin file that emulators accept. So remains someone with z80, TI-OS and calc hardware stuff to do the rom.
The rom would suppress the b_call, rst, interrupt calls (except custom), etc..
Advantages:
- People without roms (for several reasons) can test their ASM programs or give anyone to test/play legally. (no TI-OS is included)
Disadvantages:
- lots of work with few uses and more disadvantages than good reasons, I think
- Problems with TI-OS integration and crashes won't be tested
- It can't use any TI-OS routines
- other unpredictable problems
Anyway, suspecting of its overwhelming disadvantages, I wanted to bring to discussing anyway.
This idea appeared because of discussion to use online emulators to show some calculator programs. |
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Graphmastur
Advanced Member
Joined: 25 Mar 2009
Posts: 360
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| Posted: 21 Oct 2009 03:57:07 pm Post subject: |
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| Why is a rom even necessary? I always wondered why we needed a rom image, when we had an operating system. |
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Galandros
Active Member
Joined: 29 Aug 2008
Posts: 565
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| Posted: 21 Oct 2009 04:47:49 pm Post subject: |
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Graphmastur wrote: Why is a rom even necessary? I always wondered why we needed a rom image, when we had an operating system.
Not bad ideia. CSX had some support for assembly programs but you had to hexedit it. I could look a bit on it and pong.
If I find a easy way to build the OS with custom code and spasm, I will post. |
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brandonw
Advanced Member
Joined: 12 Jan 2007
Posts: 455
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| Posted: 21 Oct 2009 05:33:09 pm Post subject: |
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You could, but there's not a whole lot you can do without the OS. Everything relies on it quite a bit.
I think it would be better to combine BootFree (a boot code replacement for use in emulators by Benjamin Moody) and an 8XU OS upgrade off education.ti.com with rom8x to come up with a working ROM, and then you can test against that. You can do all that without even owning the calculator. |
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FloppusMaximus
Advanced Member
Joined: 22 Aug 2008
Posts: 472
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| Posted: 21 Oct 2009 07:59:26 pm Post subject: |
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For most programs, it's true that you don't need the entire OS available (especially if all you want to do is run the program in an emulator.) The harder question is which subset of the OS you actually need. :)
Still, most OS routines (and especially the ones that are most often used in assembly programs) perform fairly straightforward functions, and should not be that difficult to re-implement. |
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Galandros
Active Member
Joined: 29 Aug 2008
Posts: 565
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| Posted: 22 Oct 2009 07:53:26 am Post subject: |
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brandonw wrote: You could, but there's not a whole lot you can do without the OS. Everything relies on it quite a bit.
I think it would be better to combine BootFree (a boot code replacement for use in emulators by Benjamin Moody) and an 8XU OS upgrade off education.ti.com with rom8x to come up with a working ROM, and then you can test against that. You can do all that without even owning the calculator.
Another thing to check. BootFree.zip is no longer online in Benjamin Moody site (the one with pindurTI) but google code has it in its cache. I can rescue from the google code cache (it is not easily downloaded). But if someone possess, it would be nice to give.
FloppusMaximus wrote: For most programs, it's true that you don't need the entire OS available (especially if all you want to do is run the program in an emulator.) The harder question is which subset of the OS you actually need. :)
Still, most OS routines (and especially the ones that are most often used in assembly programs) perform fairly straightforward functions, and should not be that difficult to re-implement.
I only need a kind of minimal OS that deals with the hardware stuff and ram and rom equates available like the TI-OS (especially safe rams).
Yes, TI-OS routines won't be great problem. |
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tr1p1ea
Elite
Joined: 03 Aug 2003
Posts: 870
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| Posted: 23 Oct 2009 04:23:50 am Post subject: |
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Im pretty sure WabbitDS ships a bootfree binary, but im sure if you ask Ben nicely he can provide you with a fresh copy  .
Last edited by Guest on 23 Oct 2009 04:25:18 am; edited 1 time in total |
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FloppusMaximus
Advanced Member
Joined: 22 Aug 2008
Posts: 472
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| Posted: 23 Oct 2009 09:02:59 pm Post subject: |
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| See here - I never put it on ticalc.org or anything since it was never really finished, but it works well enough for many purposes. |
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