The Microchip Technology Inc. 27C64 is a CMOS 64K bit (electrically) Programmable Read Only Memory. The device is organized as 8K words. 27C64 64k (8k X 8) CMOS EPROM FEATURES. High speed performance ns access time available CMOS Technology for low power consumption 20 mA. 27C64 EPROM Datasheet, 27C64 64K EPROM Datasheet, buy 27C

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It’s fairly easy to do, first draw a table on graph paper or use a spreadsheet of the input states, these are the EPROM address lines.

27C EPROM Technical Data

Dec 248: Measuring air gap of a magnetic core for home-wound inductors and flyback transformer 7. The trouble is it has a fluorescent display and few modern processors can drive it directly. Input port and input output port declaration in top module 2.

What we do is split the 8 bits into two 4 bit characters. When using an EPROM normal use you wouldn’t swap the input digits, you keep them as they are, it’s just the odd way the Tait unit is wired that makes it necessary. Would you have a minute to take a look at a file i have produced in regards this. Programming File for 27C64 Eprom It is possible for data to be duplicated and I would expect the vast majority of the addresses to be empty in this kind of application.

27C64 EPROM Datasheet

Thanks for clearing up the mystery of the Address lines, i have a Hex editor attached to the Eprom Programming software that allows me to enter data at specific locations so hopefully i am on the right track now.

I’m suspicious of the maximum voltage for logic 1 being 2. It would have to be replaced with an LCD but that introduces mechanical problems of fitting one in the same space. Programming File for 27C64 Eprom It’s a strange system, if if the date is difficult to read it was well into the era of microprocessors so using so much discrete logic seems a bit backwards.

It that is the case, and if the radio is working at the moment, I suggest you note the voltages on the EPROM outputs for each channel number you select. Each of the 4 bit patterns is translated to a single hexadecimal character like this: PNP transistor not working 2. I don’t mean to take up all of your time but i would be really interested in hearing more about the microprocessor option if you are able, there is plenty of space on the channel change module and might be easier to generate a small board that could plug in in place of the Eprom.


It is very easy to convert the bit pattern from binary to hexadecimal.

Results 1 to 20 of There will be gaps in the contents of the EPROM so don’t worry if there are empty addresses you don’t use. Equating complex number interms of the other 6.

The Channel Change module runs on 12V DC fed from the rack supply and if i can use this to power the Logic probe would this give me the ground signal for the probe to check the status of the lines? I worded that badly, not sure now what info i need so that the Eprom can decide which output lines to pull low Ground Apologies.

Thanks again for your help, Tait I have the Eproms for the TX and RX modules correctly burned with programming files provided by the equipment manufacturer Tait but i am lost as to how to create a BIN or Hex file from scratch to get the Channel Change Eprom to output the correct switching via its Data out lines.

You have cleared up a lot of my confusion over this and have given me a Good place to start, time to do some serious study.

You will see distinctly different voltages on the pins and they will almost certainly be very close to 0V or 5V. Synthesized tuning, Part 2: Thanks again for your time, Regards, Chris S.

27C64 – 27C64 64K EPROM Datasheet

If I understand what you want, you have known input lines states and you want to convert them to different output line states by using the EPROM as a look-up table. 27c46 example, if you wanted EPROM channel 10 to produce an output of you would first reverse the channel digits and use address 01, then split the 8 bit output you want into two becomes then convert each to hexadecimal to find the number to store in the EPROM.


If this is true would i be able to measure with a DVM on DC volts the output state of the data lines out of the Channel Change eprom to confirm i have the correct lines either high or low to replicate the Dip switch settings on the Eproj Eprom Board? If that isn’t physically eeprom to do, with the power off, measure the resistance between the GND pin and nearby chassis to make sure they really are connected then use the chassis as the negative connection point.

What you ask for is very easy to do, you need to think in hexadecimal though instead of decimal. It would be useful to note this because you may be able to use it to calculate new channel frequencies. Choosing IC with EN signal 2. The on the third schematic is periodicaly pulsing the latch signal so the switches are read in.

Remember it doesn’t hold a program, it’s just a look-up table so it wouldn’t use more addresses than there were things to look up.

AF epro in Transmitter what is the A? I have 10 channels but if you could possibly show me this one example i can work the rest out by trial and error, hopefully. I have 27×64 out your reply and will study it tonight in detail when i can concentrate on it fully. The radio module Eprom is working correctly as i can manually select the Channels via the 8 pin 27c664 switch and they follow the Dip Switch codes from the manual.

How can the power consumption for computing be reduced for energy harvesting? Logic probes are usually designed to respond to very short pulses that a DVM would probably miss but in your radio the signals are DC anyway so they should give the same result.