--- title: Watching a Z80 from an RP2350 | daily.dev description: A hands-on exploration of connecting a Raspberry Pi RP2350 microcontroller to a Z80 processor bus. Covers Z80 bus architecture (16-bit address, 8-bit data),... canonical: https://daily.dev/posts/watching-a-z80-from-an-rp2350-8xlkaihns twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Watching a Z80 from an RP2350 | daily.dev og:description: A hands-on exploration of connecting a Raspberry Pi RP2350 microcontroller to a Z80 processor bus. Covers Z80 bus architecture (16-bit address, 8-bit data),... og:url: https://daily.dev/posts/watching-a-z80-from-an-rp2350-8xlkaihns og:image: https://api.daily.dev/og/posts/8XLkAIhnS.png og:image:alt: Watching a Z80 from an RP2350 og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Watching a Z80 from an RP2350 **[Two Stop Bits](https://daily.dev/sources/twostopbits)** · 10 min read · 1 upvotes · 0 comments ## Summary A hands-on exploration of connecting a Raspberry Pi RP2350 microcontroller to a Z80 processor bus. Covers Z80 bus architecture (16-bit address, 8-bit data), clock timing constraints (minimum ~5KHz), and RP2350 GPIO API quirks for the 48-pin RP2350B. Includes working C code to read the Z80 data bus and detect IO writes to specific addresses, effectively emulating a simple RC2014 digital IO module using the RP2350's ARM cores. Future directions include PIO-based autonomous bus monitoring, memory-mapped device emulation, and clock control for instruction-aware stepping. ## Full article daily.dev links to this article rather than hosting it. 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