Differences
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Both sides previous revisionPrevious revision | |||
memory_map [2022/08/19 10:48] – [IO registers] pulkomandy | memory_map [2023/04/16 10:15] (current) – [External bus configuration] pulkomandy | ||
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* 00 - Map entire range to ROMCSB | * 00 - Map entire range to ROMCSB | ||
* 01 - Map '' | * 01 - Map '' | ||
- | * 1x - Map '' | + | * 1x - Map '' |
* Bits 5-3: Bus arbitration priority control | * Bits 5-3: Bus arbitration priority control | ||
* 101 - 1. Audio, 2. PPU, 3. CPU | * 101 - 1. Audio, 2. PPU, 3. CPU | ||
Line 222: | Line 222: | ||
External RAM mapping overrides any ROM mapping. | External RAM mapping overrides any ROM mapping. | ||
+ | |||
+ | On the V.Smile, both ROMCSB and CSB1 allow to access the cartridge ROM. This means bit 6 is not very useful. | ||
+ | |||
+ | CSB2 is the cartridge RAM, and CSB3 is the system ROM. They are both enabled at the same time by using bit 7. | ||
==== ADC ==== | ==== ADC ==== |