FUZIX for the N8 Retrobrew Home Computer

Z180 @18.432MHz with 0x40 I/O base
SD card via CSIO

Keyboard PS/2 setup

	Set 82C55 config to 082h	(A out B in C hi out C low out)

Port C bit 4 is data out, clock out is bit 5
Port B bit 1 is clock in, bit 0 is data in


N8 Hardware layout

0x40-0x7F	Z180 registers

0x80		8255 for PPIDE	
0x84		8255 for printer/keyboard/mouse
			A = printer data
			B = printer status & kbd/mouse in
			C = printer control & kbd/mouse out
0x88		RTC latch and buffer
0x8C		FDC
0x90		FDC utility
0x94		Auxiliary control register
0x96		ROM page control

0x98		VDP status
0x99		VDP address
0x9A		VDP palette latch
0x9B		VDP register access

0x9C		Sound register (w) data (r)
0x9D		Sound write (w)

RTC latch bits
0x80		RTC write
0x40		RTC clock
0x20		RTC enable data read
0x10		RTC reset (deactivate)
0x01		RTC data in
0x04		SD CS

FDC
0x8C		8272 Status
0x8D		8272 Data
0x90		DACK
0x91		DCR
0x92		DOR
0x93		TC/DACK