27c64

Programming File for 27C64 Eprom Hello, Was wondering if someone that has had some experience in creating a BIN or HEX file suitable for a 27C64 Eprom could point me in the right direction re creating a file that would allow the above Eprom to control the output of its data lines D0 - D7 so that it will switch the lines either high or Low i. Bin Eprom file that we have been discussing? FvM 18 , betwixt 12 , KlausST 10 , barry 10 , ads-ee 7.

Uploader: Moogut
Date Added: 11 February 2012
File Size: 16.92 Mb
Operating Systems: Windows NT/2000/XP/2003/2003/7/8/10 MacOS 10/X
Downloads: 40737
Price: Free* [*Free Regsitration Required]





You could replace the whole module with just a handful of modern components, in fact you could replace the entire selector AND channel EPROM board with 27c4 simple micro and a display driver circuit. In other words anything higher than 2. Then for each input state, write the output state you need, this is what the EPROM should produce on it's data lines. 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.

What connects to the termianls of this Philips LED driver 4.

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. 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 think 27c46 still good.

Pop-ups attempting to link some website on my browser. I'm suspicious of the maximum voltage for logic 1 being 2. If you think this is correct i will 27c664 ahead and load the File onto a new Eprom and see how we go but i thought i might check with you first.

The device is a Remote Channel Change module for a Repeater rack and allows remote selection of channels in the TX and Rx modules by pulling various data lines in the same chip installed in the modules either high or low depending on the channel selected. You will see distinctly different voltages on the pins and they will almost certainly be very close to 0V or 5V. Simulation of Wireless Coils-Help Needed 1. Bin Eprom file that we have been discussing? Programming File for 27C64 Eprom Hello, Was wondering if someone that has had some experience in creating a BIN or HEX file suitable for a 27C64 Eprom could point me in the right direction re creating a file that would allow the above Eprom to control the output of its data lines D0 - D7 so that it will switch the lines either high or Low i.

KRF4A 27c64 clone programming. It is 27c644 easy to convert the bit pattern from binary to hexadecimal. Reference design for galvanically-isolated CAN transceiver.

Remember the 27C64 has 13 address lines so the values on them can be from to 1FFF but the output is 8 bits so can only go from 00 to FF. Thanks again for your help, Regards.

Filekbit EPROM Signetics 27C64 (3).jpg - Wikimedia Commons

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 would guess the data ends up in a PLL circuit elsewhere in the radio so the equal sized jumps in EPROM data would suggest that the same frequency spacing exists between each channel 10Khz, 25KHz or whatever.

Would it be possible for you to take a quick look and tell me 27f64, 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? This makes it easy, you can directly use the channel number as the EPROM address and at that address put the binary number of the output you want.

File:64kbit EPROM Signetics 27C64 (3).jpg

Glad you are feeling a bit more comfortable, i have hurt my back before and i know just what it feels like. 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.

There will be gaps in the contents of the EPROM so don't worry if there are empty addresses you don't use. You can always tell a programmer by the way they 277c64 on their fingers then take their shoes off to count on their toes as well!

Thanks again for your time, Regards, Chris S.

Not sure what you mean by "input states of the Eprom data lines", the data lines are the outputs. Sub woofer amplifier 0. 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. Because of the strange way the EPROM address pins are 27v64, the input digits are reversed so if you want channel 10 you use address 01 instead.

E Channel 02 Whether the output bits are correct or not depends on what they do later on in the radio. I'm more or less upright again now so "on with the work! You have to repeat this for each channel because the data may be different at each address.

2 thoughts on “27c64”

Leave a Reply

Your email address will not be published. Required fields are marked *