LIV2/amiga-par-to-spi-adapter
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amiga-par-to-spi-adapter/hardware/assembly-instructions.md
Niklas Ekström f7493de0b0 Revert pin assignment of BUSY and POUT signals 
The assignment of the BUSY and POUT pins to the microcontroller had
changed from the previous version to the new version. User amigos500 on
the a1k forum noted that if the assignment of those two pins had not
changed, then it would be easier to patch an old PCB to work with
the updated design.

After testing, it seems that the old pin assignment of BUSY and POUT
works equally well with the updated design, and I therefore reverted
the assignment back.
2021-07-22 21:48:59 +02:00

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Assembly instructions

The assembly of the adapter is quite simple. You need a parallel port connector and an Arduino Nano. Connect the parallel port to the Nano as follows:

Par. pin # Par. pin Nano pin Atmega328P
2 D0 A0 PC0
3 D1 A1 PC1
4 D2 A2 PC2
5 D3 A3 PC3
6 D4 A4 PC4
7 D5 A5 PC5
8 D6 D6 PD6
9 D7 D7 PD7
10 ACK D9 PB1
11 BUSY D4 PD4
12 POUT D5 PD5
13 SEL D2 PD2
18..25 GND GND GND

Connecting SD card module to Nano

To use the adapter with the example SD card driver (spisd.device), connect the SD card module to the Nano as follows:

SD card Nano pin Atmega328P
SS D10 PB2
MOSI D11 PB3
MISO D12 PB4
SCK D13 PB5
CD D3 PD3
VCC VCC
GND GND GND

CD = Card Detect. Not all modules has this pin available, but since the Micro SD card connectors typically has this pin it should be possible to solder a wire to the connector.

Note that the SD card module must have voltage level translation between the +5V used by the Amiga and the Nano, and the +3.3V used by the SD card.