One ROM now supports RAM - one chip for all your retro replacement needs

In this video I demonstrate One ROM's new 2K SRAM support on my VIC-20, with a single chip replacing all of the ROM and RAM chips. I share the moment it finally worked, and then explain how it's done, going into the depths of the RP2350's PIO and DMA's capabilities and explaining some of the lesser known enhancements over the RP2040's PIOs. 🔗 *Links* One ROM: https://onerom.org/ Buy: https://onerom.org/buy Github: https://github.com/piersfinlayson/one... ⏰ *Timestamps* 00:00 Introduction 00:29 Demo 02:51 Moment it works! 03:30 RAM chips vs ROM chips 05:47 Serving algorithm design 19:18 PIO assembly implementation 34:04 DMA implementation 37:10 Final thoughts Video content copyright (c) 2026 piers.rocks Limited. All rights reserved.