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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E Channel 02 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 It’s a static design, meaning there are no signal which change over time unless it’s because you change channel so yes you can use a DVM to check the logic levels.

Programming File for 27C64 Eprom Without intimate knowledge of the radio I can’t say the numbers are correct but they certainly look realistic. 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 coming out of the Channel change module are either “High” or “Low” depending on which Channel is selected?

Input port and input output port declaration in top module 2. The radio module Eprom is working correctly as i can manually select the Channels via the 8 pin Dip switch and they follow the Dip Switch codes from the manual. It’s better to share your questions and answers on Edaboard so we can all benefit from each others experiences.


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 frequency it is tuned to.

27C64 – 27C64 64K EPROM Datasheet

Programming File for 27C64 Eprom Got them thanks. It is very easy to convert e;rom bit pattern from binary to hexadecimal. I am using “Eprom45” buffer to generate the.

I’ll respond as soon as I can. 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. How reliable is it? PV charger battery circuit 4. The address lines are the inputs to the EPROM so they carry the number used to select the channel, you should see some of them change as you switch channels.

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.

The problem is knowing where to stop, not where to start! Would it be possible for you to take a quick look and tell me where, looking at the diagram i would enter the data to have “01” selected on the Push Buttons and have “DO” pin 11 pulled low on the Eprom output?


Programming File for 27C64 Eprom. I would guess the data ends up in a PLL circuit elsewhere in 227c64 radio so the equal sized jumps in EPROM data would suggest that the same frequency spacing exists between each channel 10Khz, 25KHz or whatever.


Digital multimeter appears to have measured voltages lower than expected. Programming File for 27C64 Eprom Thanks Brian, Looks as though i might have to stick with the Eprom Idea for a bit longer, i have a few spare 27c64 available that i 27×64 are still good.

Losses in inductor of a boost converter 9. Results 1 to 20 of Thanks again for your help, Regards. I’m suspicious of the 27c664 voltage for logic 1 being 2. Thanks again for your time, Regards, Chris S. If you know the channel frequencies it should be easy to work out, it’s likely eeprom a change of one count in the EPROM data makes a difference of one channel frequency so if you know what the channels are, it should be simple math to reverse engineer it back to the EPROM data you need.

I wouldn’t be too concerned about what other people find amusing, seeking Humour in other peoples misfortune normally indicates a low self image problem. AF modulator in Transmitter what is the A? Dec 242: There will be gaps in the contents of the EPROM so don’t worry if there are empty addresses you don’t use.