dual boot 256k eprom?

[TurboElectrics at cs.com]

Put both images into one file, then detach the upper address pin pf the 256 
from the socket. Use a swtich on it to go from 0 to 5v (resistor from pin to 
5v then switch from ground to off). This will allow you to switch from one 
half of the chip to the other, thus one program to the next.

Dylan

Date: Fri, 18 Jan 2002 11:39:35 -0800
From: "Tom Cheung" <tcheung at associated-labels.com>
Subject: dual boot 256k eprom?

i have 2 images from two 128k eproms (oem image and performance image)
i want to put them on one 256k eprom
i want to switch between the 2 images, using a regular switch on my
dashboard

anyone can tell me step by step using laymans terms
or a webpage that will desribe this with pictures?
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