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retro-peter

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@dennowiggle

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KiCad projectAll 125 files, ready to open in KiCad8.6 MB
For fabricationGerbers, drill, pick-and-place and BOMGerbers and drill zip1.9 MBGerbers and drill zip: Analyzer615 KBGerbers and drill zip: BALD299 KBGerbers and drill zip: BUTLER702 KBGerbers and drill zip: GOLD120 KBGerbers and drill zip: RANDY282 KBGerbers and drill zip: SEWER514 KBGerbers and drill zip: SPIFEE565 KBGerbers and drill zip: ZORO305 KBPick and place (CSV)27 KBPick and place (CSV): Analyzer4.9 KBPick and place (CSV): BALD4.8 KBPick and place (CSV): BUTLER6.7 KBPick and place (CSV): GOLD1.8 KBPick and place (CSV): RANDY620 BPick and place (CSV): SEWER4.9 KBPick and place (CSV): SPIFEE5.5 KBPick and place (CSV): ZORO2.7 KBBOM CSV226 KB
Schematic PDFEvery sheet, to read or print1.8 MB
3D modelThe board with its parts, for an enclosure (GLB)3D model (GLB)2.8 MB3D model (GLB): Analyzer17 MB3D model (GLB): BALD8.1 MB3D model (GLB): BUTLER1.6 MB3D model (GLB): SEWER16 MB3D model (GLB): SPIFEE13 MB3D model (GLB): ZORO9.1 MB
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README

Retro-PETER

A Retro computer project => FPGA peripheral board + 3.3V RCBUS slot + CPU board(s) making a custom system.

Description

Retro-PETER is a family of boards based around the Lattice ECP5 FPGA to create a custom retro computer system.

  • PETER base board with FPGA provides the peripheral features. It has on board SRAM memory but no CPU.
    • One 3.3V RCBUS connector provides a CPU slot.
    • One 3.3V RCBUS expansion connector allows connection of an RCBUS backplane for more card slots.
  • ANALYZER is a 5V tolerant 72 channel logic analyzer for RCBUS.
  • BALD is an RCBUS LED card that flickers lights when there is activity. I found this useful for bringup of new CPU's either on an RCBUS CPU card or internal CPU cores.
  • BUTLER is a backplane with voltage translation logic to support 2 x 3.3V connectors for 3.3V RCBUS cards and 3 x 5V connectors for 5V RCBUS cards.
  • GOLD is a simple LED board that connects to 6 GPIO outputs for flashing lights and debug info. I love a binary counter.
  • RANDY is a bus adapter from RCBUS to John's Basement 2067-Z8S180 card.
  • SEWER is an eZ80 CPU card.
  • SPIFEE is an RCBUS board with an M68SEC000FU20 CPU that runs in 8-bit mode.
  • ZORO is a Z180 RCBUS CPU card.

WARNING : This is a 3.3V system and any connections to PETER, including RCBUS, must NOT exceed 3.3V.

Disclaimer This is a hobby project and a vehicle for play. Not intended to be a product or to be optimised for size, cost, function, or meet any standard. All boards are prototypes and should be considered such even if there are new revisions over time.

Background

John Winans has a video series and boards for an ice40HX4K + Z180 CPU card aka Z80 Nouveau. There is also a companion CP/M video series and project files. This project grew from following along with those video's and projects. Here are some links to follow John's work :

  • John's Basement FPGA YouTube series.
  • John's Basement Z80 Nouveau YouTube series.
  • John's Basement Z80 Retro YouTube series covering CP/M.
    • CP/M SW to go along with the video series and which supports 2057-ice40HX4K + 2067-Z8S180 aka Z80 Nouveau.
  • Johns Z80 Retro! Discord channel.
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