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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Last edited by tait ; 21st April at I have printed out your reply and will study it tonight in detail when i can concentrate on it fully. Programming File for 27C64 Eprom. Measure the voltages on all the Address lines and write down whether they are high or low as a binary number, for example: I will try and scan a copy of the Circuit Diagram from a hard copy i have.

27C64 – 27C64 64K EPROM Datasheet

Part and Inventory Search. 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 don’t know if this is correct and would be very grateful if you could point out any mistakes in my file as epfom does not look like any.

Will be in touch when i have had a good look with my thinking cap on. Equating complex number interms of the other 6. It’s better to share your questions and answers on Edaboard so we can all benefit from each others experiences. What I meant by using a small micro was you can achieve the same result as using a ‘hardware’ EPROM look-up table by doing it in software.

I’m suspicious of the maximum voltage for logic 1 being 2. When erom have done it for all the input combinations you need, program the chip. The on the third schematic is periodicaly pulsing the latch signal so the switches are read in.

Usually in this scenario, the bits are used to set the division ratio in a PLL controlled oscillator and hence the epeom it is tuned to. I have attached a small portion of the instructions that were included in eorom manual regarding the odd way the data is entered to complete the Eprom.


I am not fluent with Eprom programming and i have probably messed up the conversion from Binary to hex or placed it in the wrong location. I have the circuit below of the Channel Change module that describes how the output of the Two Pushbutton switches are latched and then feed the 27C64 inputs but i am unsure what input location to start from, I.

Bin Eprom file that we have been discussing? Bits 7, 6, 5 and 4 make the first character and bits 3, 2, 1 and 0 make the second character. Programming File for 27C64 Eprom Hello Brian, Hope you are feeling a bit better, Would you mind having a quick look at the attached Circuit diagram of the other end of this Combination and tell me if i can do a check of which Data output lines 27v64 out of the Channel change module eproj either “High” or “Low” depending on which Channel is selected?

If i wanted to select 01 on the Pushbutton switches how would that relate to the input states of the Eprom data lines? If you know the channel frequencies it should be easy erpom work out, it’s likely that a change of one count in the EPROM data makes a difference of one channel frequency so if eprok know what the channels are, it should be simple math to reverse engineer it back to the EPROM data you need. Programming File for 27C64 Eprom Got them thanks.

Similar Threads Eprom programming help 8. For example if the input lines were the address is C and you wanted to output on the data lines the value to place in C would be 9B. 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.

Programming File for 27C64 Eprom Thanks Brian, I am still 27v64 trouble getting a Correct Eprom image that will work correctly combining the Channel change module and the radio Module. You 2c764 see distinctly different voltages on the pins wprom they will almost certainly be very close to 0V or 5V.

When using an EPROM normal use eprrom 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.


In other words anything higher than 2. Eprom image file for the prom in Power alarm system 0.

I am using “Eprom45” buffer to generate the. It’s fairly easy to do, first eproj a table on graph paper or use a spreadsheet of the input states, these are the EPROM address lines. Programming File for epro Eprom I’m back again – sorry for the delay, I’ve suffered from a spine problem for years, it causes unpredictable spasms that probably look quite comical to watch but having slipped and torn a muscle in my lower back the last thing I wanted was any sudden movements!

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.

BTW – eprlm back is much better thanks.

27C EPROM Technical Data

It that is the case, and if the radio is working at the moment, I suggest erpom note the voltages on the EPROM outputs for each channel number you select. 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 assume the outputs from the EPROM are connected to the inputs of a PLL circuit so erpom different frequencies are selected for each combination of logic state.

After a while, when you have got used to thinking in hexadecimal it all falls into place, it’s easier than it looks. Programming File for 27C64 Eprom Sorry for the late reply – I’ve had a minor accident and can’t sit upright at the moment! I have a rather old but still functional FRG receiver here which is crying out for a revised processor board, especially as the original has some serious bugs in it’s software. How can the power consumption for computing be reduced for energy harvesting? Thanks for your Help, Brian.