What would be a good 5v eprom I could use
Not yetHi 99,
If you are planning to use an EPROM on an actual project, you need a EPROM programmer.
Do you have a programmer unit.?
E
Connect the 8-bit input to A0 to A7 (see post #5) LSB to A0, MSB to A7How would I connect the EPROM like this with the 8 bit input
Wiring would be simplified if you used an EPROM like M27C4002. The output is 16 bits, so you don't need to split the table across 2 8 bit EPROMs.What would be a good 5v eprom I could use
Great minds think alike!If you are planing on using a multiplexed display a variation on the EPROM idea would be to connect the 8 input bits to address lines 0 to 7 and a multiplexing counter (which counted to 3 or 4 for the multiplexing.) connected to address lines 8 and 9. You would only use 4 data output bits from the EPROM and connect these to the inputs of a 7 segment decoder.
So each multiplexing time slot only needs to output one digit. So each of the three areas of the EPROM (Selected by A8 and A9) would only contain the information for one digit. (Units, tens, hundreds.). You could even dispense with with the 7 segment decoder if you used 7 output bits from the EPROM and programmed the EPROM with the 7 segment patterns rather than the decimal digits.
Les.
I started using 32x8 PROMs in the mid 70's and there were no LS parts. When I searched, I only saw one URL to it and you had to join to download the datasheet. I passed...Cheers for that.... I thought I heard it somewhere..
Funny though.. A quick google lists 74LS185...
Where would you purchase the 74LS185'sWhile looking for the datasheet on the 74ls185 I came across this link to an instructable which contains a link to the datasheet.
Les.
You can make your own using 8x32 PROMs; 8 bits would require 3 of them. If you were tempted to go that route, you should just program an EPROM with a 16 bit output. In the thread I referenced earlier, I programmed one to do 4 BCD digits.Where would you purchase the 74LS185's
by Jake Hertz
by Duane Benson