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Character Conversion DMA Parameters: Difference between revisions
From SnesLab
(# of horizontal characters) |
(located on SA-1) |
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'''CDMA''' is 8 bits wide, located at 2231h. It is initialized to zero. | '''CDMA''' is 8 bits wide, located at 2231h on the [[SA-1]]. It is initialized to zero. | ||
The low two bits determine the character conversion DMA color mode. | The low two bits determine the character conversion DMA color mode. | ||
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Bits 2 to 4 are the power 2 should be raised to to yield the number of virtual VRAM horizontal characters. | Bits 2 to 4 are the power 2 should be raised to to yield the number of virtual VRAM horizontal characters. | ||
Bits 5 and 6 are zero. | |||
=== Reference === | === Reference === | ||
Latest revision as of 18:39, 7 July 2024
CDMA is 8 bits wide, located at 2231h on the SA-1. It is initialized to zero.
The low two bits determine the character conversion DMA color mode.
The 5A22 sets the most significant bit when character conversion 1 is completed.
Bits 2 to 4 are the power 2 should be raised to to yield the number of virtual VRAM horizontal characters.
Bits 5 and 6 are zero.
Reference
- 4.1.28 on page 1-4-21 of Book II of the official Super Nintendo development manual