Difference between revisions of "83Plus:BCALLs:8054"
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Nyquist562 (Talk | contribs) (Added comment about effect of call of reg. A) |
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=== Inputs === | === Inputs === | ||
| − | * | + | * A = source page |
| + | * HL = source address | ||
* DE = destination address | * DE = destination address | ||
* BC = number of bytes to copy | * BC = number of bytes to copy | ||
=== Outputs === | === Outputs === | ||
| − | * | + | * HL advanced by BC bytes |
* DE advanced by BC bytes | * DE advanced by BC bytes | ||
* BC = 0 | * BC = 0 | ||
=== Destroys === | === Destroys === | ||
| + | * A | ||
* [[83Plus:RAM:8100|ramCode]] | * [[83Plus:RAM:8100|ramCode]] | ||
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Note that the high bits of A are masked out appropriately (so, for instance, passing A = 7F will read from the boot page regardless of the hardware version.) Set A = 0 to copy data from the main RAM; you cannot use this routine to copy data from the extra RAM. | Note that the high bits of A are masked out appropriately (so, for instance, passing A = 7F will read from the boot page regardless of the hardware version.) Set A = 0 to copy data from the main RAM; you cannot use this routine to copy data from the extra RAM. | ||
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Latest revision as of 05:17, 17 September 2008
Synopsis
Unofficial Name: FlashToRAM2
BCALL Address: 8054
Copy data to RAM from either Flash or RAM.
Inputs
- A = source page
- HL = source address
- DE = destination address
- BC = number of bytes to copy
Outputs
- HL advanced by BC bytes
- DE advanced by BC bytes
- BC = 0
Destroys
- A
- ramCode
Comments
This is almost exactly equivalent to the OS FlashToRAM.
Note that the high bits of A are masked out appropriately (so, for instance, passing A = 7F will read from the boot page regardless of the hardware version.) Set A = 0 to copy data from the main RAM; you cannot use this routine to copy data from the extra RAM.
