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Z80 & 68k Assembly =>
z80 & ez80 Assembly
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Jeffrey
Member
Joined: 12 Jun 2003
Posts: 212
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 Posted: 31 Aug 2003 08:58:42 am Post subject: |
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This topic pertains to the other topic (Drawing Pics with ASM), but is an entire topic of its own (confusing, huh?).
How do you load the real variable A into register A in an ASM program? |
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Tyraniek
Member
Joined: 07 Jun 2003
Posts: 133
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| Posted: 31 Aug 2003 10:41:27 am Post subject: |
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First of all, you have to understand that you won't be able to load exactly the real number A in the register A, because the register is 8-bits (one byte), and the real variable is 18 bytes and can be decimal !
That means that while the variable A can be between -10^99 and 10^99 and can be decimal, the register will only be able to store a number between 0 and 255 !!!
Then, I'm not sure getting the variable A is a good idea. You'd better try to get the variable X or even "Ans", so that you're able to use a ROM call.
However, you could do the following (supposing you've stored A in X) :
Code:
B_CALL(_rclX) ; X is in OP1
B_CALL(_convop1) ; Now you get the Less Signifiant Byte of OP1 in register A
You could do the same with B_CALL(_rclAns), but 'm not sure there is any "_RclA". |
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Adm.Wiggin
aka Tianon
Know-It-All
Joined: 02 Jun 2003
Posts: 1874
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