Just wondering being all I have is 2532's and I want to program some Asteroids ROMS.
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Thanx guys, but I don't have any 2716's either..they are 2532's. Now IIRC you can double up the image to fill the 32bit chip but what was the DOS parameters to do this with the ROM file?
You can do this with just about any hex editor. I use http://frhed.sourceforge.net/ although I know there are better ones out there.
BTW even if you double-up the image you should still ground (or pullup) the highest address bit on the '32.
I'm still learning this kinda stuff so I need to ask...do you mean pulling a pin up from the socket so it doesn't seat? If so which pin on the 2532?
You don't want to leave the highest address bit floating - in the case of the 2732, it's A11 (pin 21). This pin, on the 2716, is the VPP pin, which should already be tied high on the board. Look at the board, and see what's connected to this pin.
And in general, to pull a pin up means to connect it to +5v.
-Ian
Thanx Ian, I think I get it now. So on the 2532 ROM I'd have to connect, via wire jumper, the VPP pin to +5v correct?
And in general, to pull a pin up means to connect it to +5v.
-Ian
It usually means connecting through a 1kOhm resistor.
Depending on application. When applying to extra, unused address lines, there wouldn't be a resistor, since it's not needed. The resistor is there in case you want to keep it pulled up but still allow some other signal to pull it down.
-Ian
Then that would be 'tying' it to +5V. Just semantics. Plus you need to read the datasheet carefully to make sure that won't hurt the device. I doubt it would in the case of a 2732, but other devices might not like it.
Yeah... technically, you're correct - the best kind of correct.
And yes, in the case of an EPROM, tying unused address lines high or low is fine.
-Ian
http://store.pacmandotcom.com/searc...y=desc&search_query=2516&submit_search=Search
I only have around 25 of the 2516 but you can also use 2716. I have 400 of the 2716. Buy 20+ and I will do qty discount.