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PRG-ROM Bank Register ($5000)Bit 7654 3210 REPP PPPP ||++-++++- Select 16 or 32 KiB PRG bank at CPU $8000 |+-------- 0: Bank comes from main cartridge(don't care this bit, never used) | 1: Bank comes from expansion cartridge(missing mostly, don't care) +--------- Romter enable 0: Bank comes from ROM (main or expansion cartridge) 1: Bank comes from 128 KiB secondary PRG-RAM (SB-97 only)The SB-97 has certain features of early RAM based flash carts, allowing the ROM data to be read from the disk and temporarily stored in the 2nd PRAM (128KB, expandable), then set $5000.7, switch to Romter mode, and run games in SRAM
Not using the programming flash-ROM method, but only loading to SRAM, it has stable industrial production significance and will not cause system OS/BIOS damage due to shutting down before loading/booting is completed
Statistics: Posted by aquasnake — Tue Apr 23, 2024 1:47 am — Replies 1 — Views 127