In external version Wicher500 I connected RTC DS1306
I did not know SPI real time clock existed.
Nice fact about SPI devices - is already a lot of open source C code to support them.
So should be fairly straightforward to get Amiga drivers written.
I doubt SD card would be bootable, would be much much more difficult?
But cheap network or WiFi should happen pretty quick.
Faster than PlipBox.
I did say thank you to TerribleFire for putting SPI on his accelerator, so thank you too Spidi. I think there are enough A500s out there to support the 2 different styles - TF is quicker but not so easy to get quantities of 68030 chips these days, especially at high speed.