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Baffa-2 Printer Interface

Making Baffa-2 Homebrew Computer print like old school computers

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This is a Parallel IO Interface based on SC103 Z80 PIO board by Stephen Cousins (https://smallcomputercentral.wordpress.com/sc103-z80-pio-module-rc2014/) with some modifications to support a DB25 connector.

The prototype board has been tested with my CP/M machine (see Baffa-2 Homebrew Computer at https://hackaday.io/project/183266-baffa-2-homebrew-microcomputer) but can there is another board layout compatible with RC2014 pinout.

For my next step, I will adapt the Baffa-2 Bios (which is based on Grant Searle's Bios) to natively support the printer as LPT (Standard line printer) output.

This is a demonstration of how the printer interface works.

The next step is to update the BIOS Rom for the Baffa-2 computer to support the printer via CP/M. The BIOS is sourced from Grant Searle and adapted for Baffa-2.

schematics_RC2014_Parallel_IO.pdf

RC2014 Parallel I/O Schematics

Adobe Portable Document Format - 149.65 kB - 05/28/2022 at 01:53

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schematics_Baffa2_Parallel_IO_rev1.pdf

Baffa-2 Parallel I/O Schematics

Adobe Portable Document Format - 149.60 kB - 05/28/2022 at 01:53

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PDEMO.BAS

Baffa-2 PIO - PRINTER DEMO

bas - 890.00 bytes - 04/18/2022 at 03:47

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  • 4 × 100nf Capacitor
  • 1 × 100uf Polarized Capacitor
  • 1 × 10k Resistor Network
  • 1 × 74LS08N Logic ICs / Gates and Inverters
  • 1 × 74LS688N Logic ICs / 8-bit Magnitude or Identity Comparator

View all 11 components

View all 3 project logs

  • 1
    Schematics for Baffa-2 Printer Interface
  • 2
    Schematics for RC2014 Printer Interface

View all instructions

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