On 2012-09-17, at 18:44, Gerrit Heitsch wrote: >> The NAND version looks like this: >> >> https://dl.dropbox.com/u/58002657/rom_replacement_nand.png >> >> It has four pull-up resistors. > > You can eliminate 2 of them since a truly unused input can just be tied to +5V directly. That means R304 and R301 can be replaced by a direct trace to +5V. Right! It seems obvious.. but only after being told ;-) Thanks. > The other two you will need though since you have 2 inputs that need to be pulled to HIGH through a resistor in order you to be able to pull them to GND when needed without shorting the supply. I don't see how using a 148 would change that. I guess Jim didn't take the JP301 into account (as he mentioned) and therefore had one signal less to care about. -- SD! Message was sent through the cbm-hackers mailing listReceived on 2012-09-17 19:01:10
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