NAME
	flash - in-situ 29F040 flash ROM programmer for N8VEM, Zeta and N8 
	computers.

SYNOPSIS
	flashz
	flashn8

DESCRIPTION
	The flashz and flashn8 erase and program the FLASH ROM chip from an
	image file.  flashz is used for the N8VEM Z80-SBC and Zeta computers.
	flashn8 is used with the N8 home computer.  Both function the same
	except in the way memory is addressed.

	flash expects a 512k file in the same directory containing the image
	that will be programmed into the ROM.  This file must have the
	unimaginative filename of ROM.IMG.  The whole process of erasing and
	programming the ROM takes less than a minute for an 8MHz Zeta - far
	less than the time taken to upload your new image.

	This program is only suitable for 512k FLASH ROMs.  Older chips
	use 14-bit addresses of 5555h and 2AAAh for their command sequences, 
	newer chips use x555h and x2AAh.  This program uses the older addresses
	as the newer chips are backward compatible.  Versions of this program
	earlier than v0.6 were for newer chips only.

	Assemble with TASM using the commands
	tasm -t80 -g3 flashz.asm flashz.com
	tasm -t80 -g3 flashn8.asm flashn8.com

JUMPERS
	The following jumpers must be in place on the boards to allow the
	29F040 to be programmed.
	For the N8VEM Z8-SBC MK-II: 	K1 1-2, K6 2-3, K8 2-3
	For the N8: 			K3 1-2, K4 2-3, K5 2-3
	For the Zeta, no jumpers need (or can) be set.

AUTHOR
	Written by David Giles so he doesn't have to open the box his Zeta
	lives in so often.  Reports to N8VEM group or vk5dg@internode.on.net