Imported from GitHub: rallepalaveev/a2pico · commit 28c7d9c · license MIT

Description

A2PICO

README

Version 1.4 is the innitial design with 3x 74LVC245 and 1x 74HC08 to prove the concept. However it is obsolete as it does not switch off the Expansion ROM ($C800-$CFFF), which is always available and could cause data bus colisions if used with other cards that use this memory space.

The RPI usage is as follows:

GPIO	Usage
0	UART TX
1	UART RX
2 - 13	A0 - A11
14	R/W
15 - 22	D0 - D7
26	ENBL
27	IRQ
28	RES