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Alien Probes

A board series to help debug hardware at the lowest level

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This board series include a STM32F405 microcontroler connected to a computer via a CH340G serial to USB chip. The probe is connected in place of the target CPU with a special connector.
The project is flagged as completed, as the hardware is now working. However, support for other CPUs may be added in the future, and firmware is still work in progress.

The MCU that I use for this series of boards is a STM32F405VGT6. It has ample room for controlling bits, and it can also run a software emulator for most of the 8-bit CPUs out there. The STM can support DMA and interrupts.

Supported CPUs so far:

Z80, Z8001, 8088, PC-XT, Generic

All these provide test features:

1) Bit control and probe to test for short, continuity, and other basic malfunction

2) Bus transaction to test peripheral (helps tame periferals to peripherals!)

3) Memory editing, IO manipulations

4) (Z80 for now) Emulation, stepping and register manipulation

Z80.png

Former Z80-ICE2 is now an Alien Probe! Errors from Z80-ICE2 were corrected.

Portable Network Graphics (PNG) - 114.00 kB - 05/23/2026 at 14:04

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KiCAD-Z80.zip

The Z80-ICE2 is now part of the Alien probes! Like the others, files include: Schematic, PCB, GERBERs, BOM (ODS file), pdf

Zip Archive - 651.46 kB - 05/23/2026 at 14:00

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KiCAD-Leadframes.zip

Leadframe PCBs for 48-pin, 40-pin, 32-pin and 28-pin DIPs. It adapts a DIP chip to a standard header either male or female. The lead frames can be bought on ebay here: https://www.ebay.ca/itm/296681581555 To solder the lead frame, it's best to cut the strip to length; i.e. for a 40-pin module, cut 2 20-pin strips. Leave them all attached and cut the frame holders after soldering.

Zip Archive - 173.71 kB - 05/23/2026 at 05:34

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KiCAD-8088.zip

This is version 2 of the PCB, correcting errors from previous version. All KiCAD files to generate the PCB. Includes: Schematic, PCB, GERBERs, BOM (ODS file), pdf

Zip Archive - 1.10 MB - 05/23/2026 at 05:19

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KiCAD-Generic.zip

This is version 2 of the PCB, correcting errors from previous version. All KiCAD files to generate the PCB. Includes: Schematic, PCB, GERBERs, BOM (ODS file), pdf

Zip Archive - 1.16 MB - 05/23/2026 at 03:39

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