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pinouts [2021/05/13 23:04] – [Smart Keyboard (Clavier Tip Tap)] pulkomandy | pinouts [2021/08/29 21:37] – [V.Smile cartridges] pulkomandy | ||
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* Sense is connected to VDD to indicate that a cart is inserted. It is connected to the RESET pin, so inserting a cartridge will power the console off. | * Sense is connected to VDD to indicate that a cart is inserted. It is connected to the RESET pin, so inserting a cartridge will power the console off. | ||
* Card detect is connected to VDD to indicate that a cart with ROM is inserted (?) maybe it allows booting from cartridge instead of internal ROM (tbc) | * Card detect is connected to VDD to indicate that a cart with ROM is inserted (?) maybe it allows booting from cartridge instead of internal ROM (tbc) | ||
- | * ROM CSB1, ROM CSB2 and RAM CSB allow to select which bank of the cartridge is accessed. Typically cartridges use only ROM CSB1, but larger cartridges (example: alphabet adventure) need two ROM banks. ROM_CSB2 may also be used for battery-backed SRAM. | + | * ROM CSB1, ROM CSB2 and RAM CSB allow to select which bank of the cartridge is accessed. Typically cartridges use only ROM CSB1, but larger cartridges (example: alphabet adventure) need two ROM banks. ROM_CSB2 may also be used for battery-backed SRAM. The two pins are controlled independently as GPIO from the CPU, so all 4 combinations are possible. However, 11 will be used when the internal ROM is accessed, so it's better to have the cartridge idle in that case. |
To be confirmed: | To be confirmed: | ||
- | | + | * What is RAM_CSB? It is not connected on the only cart known to use SRAM. The name of the pin comes from schematics of the console but it just shows that it is connected to the SPG200C without any other info. SPCE1600 datasheet shows it would be usable for external RAM, where in the address space would it be mapped in that case? |
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==== Battery backup cartridge ==== | ==== Battery backup cartridge ==== | ||