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Z80 & 68k Assembly =>
z80 & ez80 Assembly
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anduril66
Anduril is the Flame of the West!
Member
Joined: 25 May 2003
Posts: 129
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 Posted: 21 Nov 2003 05:34:40 pm Post subject: |
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What is stack_ptr (as in the hex bytes for its address)? I couldn't find it in the TI 83 Plus include file or the ISS (it wouldn't be there, but I looked anyway).
Also, if in hex I use jp, do I count from 9D95h up x bytes, where x is the number of bytes between the prog start and "label". Is AsmPrgm considered a byte in the program? Is it removed during compiling? |
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sgm
Calc Guru
Joined: 04 Sep 2003
Posts: 1265
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| Posted: 21 Nov 2003 06:18:54 pm Post subject: |
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The stack pointer isn't a memory location, it's that SP register that the Z80 uses to maintain its hardware stack.
If you hand code JP the encoding is "C3 <low> <high>" where <low> is the low order byte of the address you want to go to, and <high> is the high order byte. |
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JacobdeHaan
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Joined: 10 Jul 2003
Posts: 165
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| Posted: 22 Nov 2003 12:27:07 am Post subject: |
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Also, AsmPrgm is not removed during compilitation, because it is needed to keep the calculator's Basic interpreter from trying to run it.
The "ret" in MirageOS and Ion do the same thing to trying to run ION programs as nostub. |
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sgm
Calc Guru
Joined: 04 Sep 2003
Posts: 1265
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| Posted: 24 Nov 2003 03:07:50 pm Post subject: |
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But if you mean that you saw (stack_ptr) somewhere it would mean that you have to define it yourself.
stack_ptr =AppBackupScreen
And when you do JP, you count up from address $0000. So yes, you count up x bytes from $9D95. |
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