Apple-2-HW/unified_retro_keyboard
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Project to provide keyboard replacements for various classic computers, as well as classic ASCII keyboard
94 Commits 9 Branches 8 Tags 62 MiB
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Ruby 7%
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Makefile 2.4%
Python 1.6%
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David Fenyes dae4b8d322 Replaced the Virtual out pulse function with long and short pulse 
- Replace V_PULSE with V_PULSE_LONG and V_PULSE_SHORT functions.

- replace the asdf_arch_pulse_delay() with asdf_arch_pulse_delay_short() and
asdf_arch_pulse_delay_long() functions.

- modify keymaps to use long and short pulses.

- long pulse is 50 ms.  Short pulse is 10 us.

- Added localizing prefix to keymap definitions to avoid conflicts.
2020-03-17 01:42:51 -05:00
firmware/asdf Replaced the Virtual out pulse function with long and short pulse 2020-03-17 01:42:51 -05:00
hardware Add a header-and-mounting-holes footprint with fewer mounting holes 2020-03-16 13:36:19 -05:00
README.md fix typo 2020-02-21 00:29:12 -06:00

README.md

Unified ASCII Keyboard

This project aims to provide a (near) universal ASCII keyboard for vintage computers. Home computers of the 1970's typically either polled a switch matrix, or interfaced to a parallel ASCII keyboard via a parallel port.

The keyboard allows use of Cherry MX keys, or Futaba MD-4PCS (aka George Risk KBM-01-01) keys.

The keyboard is designed using KiCad in order to be the most useful for anybody wishing to modify the keyboard for more specific uses, or to add to the project.

This keyboard project so far consists of:

  • A classic retro-style ASCII keyboard, modeled after the ADM-3A keyboard, which can be also be populated to fit perfectly in an Apple II/II+ case, or an OSI case.
  • A keyscan/decoder interface module that can output parallel ASCII, and can be adapted for other protocols.
  • An OSI-compatible interface module.