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Amiga 1200+

By Jeroen Vandezande

About

This project is a re-implementation of the Amiga 1200 board started from the schematics.
I made some changes and enhancements to the original schematics.

Features

  • All Original AA chips are needed and can be put into the sockets. These include Lisa, Paula, Alice, The two CIA chips and the Keyboard controller.
  • Gayle, Budgie and the DRAM have been removed and the functionality has been moved to a daughterboard. This board can also contain a CPU.
  • Video output has been moved to a seperate output board. This board get all Lisa output signals and also all the typical Zorro signals. This means that an RTG card can be developed.
  • The PCMCIA slot has been removed and in the free space a power switch, boot selector switch (DF0:/DF1:) and a uSD card slot have been added.
  • A single supply universal power input has been added. (15V - 36V) From this the following voltages are created:
    • 5 Volts: main power rail 5 Amp capable
    • 12 Volts: 1 Amp capable
    • 3.3 Volts: 0.5 Amp capable (for daughter boards)
    • 1.2 Volts: 0.5 Amp capable (for daughter boards)
  • two PC standard 3 Pin fan headers are added to the board.
  • Terrible Fire compatible SPI port for network chip
  • Extension board connector for mouse/joystick. (one is in development that has USB Mouse and two classic DB-9 connectors and autoswitches when fire button is pressed)

This project is Open Source: more on Bitbucket

This is a rendering of the final product:



And some pictures of the real thing!




The Ram Board has arrived, soon will start populating that one...



Power-on reset of the keyboard controller and reset lines all over the board are working fine... I made sure that the reset was hold low for at least 450 ms.



Here is a picture of the connector on the bottom of the RamBoard and one on the main board... there will be 3 of those in a row



Finished Test RamBoard ... and it fits on the mainboard!



Rev 1, hopefully this one will give me some screen output...





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