RC2014 Z80 System with enhanced bus

January 28, 2018

I’ve been busy with my big box of PCBs and I here’s my first Z80 system design and build. It comprises of the following:

– Z80 CPU card
– 8K ROM & 8K SRAM card
– 68B50 ACIA card
– 5-slot enhanced+ backplane

It’s pretty much a standard Z80 layout but I’ve expanded the bus to the latest Enhanced Bus definition for all the cards. The 5-slot backplane uses double row (2×39) female pin headers to include the RC2014 enhanced bus and in addition I’ve added an extra set of address lines (A16 to A23) for the possibility of using 16-bit CPU’s (8086/68000) and memory options (upto 1MB) in the future.

Here’s some pics of the various cards:


Z80 Card

Memory Card

 

ACIA UART Card

 

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Big Box of PCB’s

December 27, 2017

Christmas came slightly early this year when a big box of PCB’s arrived.

Inside the box where a bunch of PCB’s for making guitar effects boards.

As well as a bunch of PCB’s for my take on a RC2014 Z80 based retro computing system.

More pics to follow when I’ve built them up.


Sick of Beige (SoB) board – DB9

January 9, 2017

Whilst looking to build some breakout boards I remembered the Sick of Beige (SoB) “standard” of PCB footprints designed by Dangerous Prototypes. DP have made a really cool set of PCB footprints in various sizes with the added bonus of being designed to be case friendly.

Dangerous Prototypes have a great page describing the various PCB sizes here:

http://dangerousprototypes.com/docs/Sick_of_Beige_standard_PCB_sizes_v1.0

sb-db9_2_small
My first Sick of Beige (SoB) board is SoB DB9, using the DP5050 footprint. This is a handy little breakout board for those wanting to build their own 9-way D-Type interfaces be it for RS232, RS485, CAN bus or any other project.

A standard 9-way D-Type (Male) connector provides the interface with 3.5mm Screw Terminals connections provided for easy interfacing. In addition a Male Pin Header connections is also provided. Two small circuit prototyping areas are also provided.

Board Details:

– 9-Pin D-Type connector (Male)
– Easy to Connect Headers
– 3.5mm Screw Terminals
– 2.54mm Pin Header
– small circuit prototyping area x2
– Compatible with Sick of Beigh DP5050 footprint
– Board Dimensions: 50 x 50 mm
– 3.2mm Mounting Holes x4

Uses:
– Industrial Control
– Robotics
– Mechatronics

As usual you can find them on my Tindie page here


WIP – new RPi Zero add-ons

June 29, 2016

This last month I’ve been working on some new add-on boards for the Raspberry Pi Zero.

In no particular order:

  • ADC16 – 16-ch ADC board (2x MCP3008 8-ch, 10-bit)
  • UserP0rt – 16-ch port expander and 8-ch ADC (MCP23S17 and MCP3008)
  • Relay2 – 2-ch Relay board (2x Relays 30V, 1A)
  • I’ve just sent these off to be manufactured, so I’ll post an update when I’ve got them back.


    Four new Raspberry Pi Zero add-on boards

    January 18, 2016

    Another bunch of new PCB’s. This time for the Raspberry Pi Zero.

    RPI_PCBs_201601_small

    In no particular order, there’s a serial RS232 board, a GVS I/O board with ULN2803 for servo’s etc., a Breakout board (I2C, SPI, UART and GPIO) and another MIDI interface ;-).

    More details/info shortly.

    As usually you’ll find them on our Tindie store.


    New RPi MIDI board and a new MIDI Breakout board

    December 13, 2015

    RPi_PIIO_MIDI_PCB

    I should have called this post “yet-another RPi MIDI board” as it’s includes my third iteration of a MIDI interface for the Pi. But YARMB doesn’t actually trip off the tongue 🙂

    So here we have a new RPi MIDI board. Briefly its spec is:

    • MIDI IN via 5-W DIN Connector
    • MIDI OUT via 5-W DIN Connector
    • 3.3V Operation
    • HAT foot print (65 x 56mm).
    • Four fixing holes.
    • ID EEPROM (not fitted)

     

    In addition to the RPi MIDI, there’s also a MIDI break out board (BoB) board. It’s spec is:

    • MIDI IN via 5-W DIN Connector
    • MIDI OUT via 5-W DIN Connector
    • MIDI THRU via 5-W DIN Connector
    • On board 5V Voltage Regulator
    • Size 80 x 49mm.
    • Four fixing holes.

     


    New Pi add-on board – RPi Breadboard+ for sale

    April 15, 2015

    RPi Breadboard+ is a solderless prototyping breadboard add-on for the Raspberry Pi. Using the breadboard and female to female wires you can quickly prototype and test your electronic design.

    A large portion of the add-on is taken up by a 140-pin breadboard and surrounding the breadboard on all four sides are a number female headers.

    All of the Raspberry Pi GPIO signals are brought out to two 16-pin female headers located near the top and bottom of the breadboard. 3.3V (5-pin), 5V (5-pin) and 0V/Ground (12-pin) power supplies are also brought out to female headers located to the sides of the breadboard.

    The add-on features 3x LED’s (red, yellow and green) and 2x push-button tactile switches each having a 2-pin female header for easy use with the rest of the board.

    Size wise it conforms to a standard HAT board size (65 x 56mm) and mounting holes. So its compatible with the Raspberry Pi A+, B+ and Pi2.

    There is an EEPROM PCB footprint for future HAT configuration compatibly but its not fitted on this version.

    RPi_Breadboard+_small

    RPi_Breadboard+_RPi_small

    You can find them on Tindie here.

    https://www.tindie.com/stores/DTronixs/