Subject: Re: [stella] Hardware questions From: "Bill Heineman" <burger@xxxxxxxxxxxxx> Date: Thu, 10 Dec 1998 10:24:09 -0700 |
>What would happen if you had 2 ROM chips selected >(by design) at the same time on a data bus? > You would use a LOT of power. >Is there risk of damaging any chips on the bus? > Yes, not immediately, but over time the heat damage to the chip trying to drive the bus high (Logic 1) would shorten the life of the ROM by a lot. >What data byte would the CPU get if the data from >chip1 is $00 and chip2 is $FF? > You'd get a 0. You see the 5 volts from the FF would be grounded and all the current would be drained by the chip giving the logic 0. In most cases this results in a logical "AND" Hence 0xFF AND 0x00 will equal 0x00 Burger -- Archives (includes files) at http://www.biglist.com/lists/stella/archives/ Unsub & more at http://www.biglist.com/lists/stella/
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