2708 EPROM PDF

The restoration of computers like our SAGA FOX LS, containing an EPROM , gave us the necessity of reading, and so storing, the. , , , , , , 27C, , 27C, , 27C, 27C, , , EPROM series. EPROM and CMOS. The Bytesaver card only uses eproms, but I’ve managed to create a socket adapter to use ‘s instead. And I’ve used the Top

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Professional tools that can do this task are really expensive.

File EPROM installed in Cromemco – Wikimedia Commons

Poi si deve collegare il pin Not Chip Select 20 ed il pin di programmazione 18 a massa. Q7 il dato letto.

To read a eprom we need 10 output for the address bus, and 8 input for the data bus: Moreover, we need a way to transmit data to a PC, so we need other two pin for a serial port. The data bus is 8 bit, so we can directly connect the bus data to one port 2780 the PIC.

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The software suite is divided in two pieces: Data is trasmitted to the serial port as an ASCII character, representing the hexadecimal value that has been read.

Every byte is separated by a space character. Serial port to be used on the PC, speed and connection parameters, the number of readings and the file name to save the dump can be changed editing the header of the Python code.

Pinout is the same but the address bus, that is 9 bit instead of So, the pin 22that in the is the 9th address line, in the is a ground. We must simply set the A1 epro, port connected to pin 22 of the EPROM to zero, and read only the values between 0 and At this point we have to simply write on the address bus A0…A9 the address of the location to program, in the data bus Q0….

We need to wait the correct time for the data to be burned about 1 ms according to the datasheet and put back to ground the programming pin We are in the process of creating the burning part needed in epgom circuit board, the PIC software and the corrispondent burning utility in Python.

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PCB board layout and circuit schematics. Monday September 10th, Tuesday August 5th, admin.

Circuit To read a eprom we need 10 output for the address bus, and 8 input for the data bus: Please write us about any error, missing part or comments! Facebook Twitter Google Email Print. We’ll assume you’re ok with this, but you can opt-out if you wish.

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