Difference between revisions of "Layer 2 RAM Shadow Page Register"
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{{NextRegister | {{NextRegister | ||
| − | |Number= | + | |Number=$13 |
|Readable=Yes | |Readable=Yes | ||
|Writable=Yes | |Writable=Yes | ||
| + | |ShortDesc=Sets the [[Memory map|bank]] number where the Layer 2 shadow screen begins. | ||
}} | }} | ||
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| + | Bits 6-0 store the number of the "SRAM page" (ie, [[Memory map|bank]]) used for the shadow Layer 2 screen. The default is 11. Because the layer 2 screen is 48kiB, it actually occupies 3 banks, and the number set here is the first; so by default, it occupies banks 11-13. (bit 7 is reserved, use 0) | ||
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| + | For shadow bank paging see [[Layer_2]] | ||
| + | |||
| + | Valid values are 0 to 109 (with 2MiB SRAM memory extension, 0 to 45 with default 1MiB memory). | ||
Latest revision as of 00:00, 1 December 2019
| Number | $13 |
|---|---|
| Readable | Yes |
| Writable | Yes |
| Short Description | Sets the bank number where the Layer 2 shadow screen begins. |
Bits 6-0 store the number of the "SRAM page" (ie, bank) used for the shadow Layer 2 screen. The default is 11. Because the layer 2 screen is 48kiB, it actually occupies 3 banks, and the number set here is the first; so by default, it occupies banks 11-13. (bit 7 is reserved, use 0)
For shadow bank paging see Layer_2
Valid values are 0 to 109 (with 2MiB SRAM memory extension, 0 to 45 with default 1MiB memory).