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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All times are GMT 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’ll assume you’re ok with this, but you can opt-out if you wish. I would also break out pin Originally Posted by kingchops. Page 1 of 3 1 2 3 Last Jump to page: I have a 2k monitor program in the top 1k of two ‘s, in two sockets each with an adapter, and the program runs as 2k of continuous memory.

I can program the ‘s using the Top, that works fine, but when I use them in the Bytesaver, the Altair doesn’t read them.

PCB board layout and circuit schematics. Poi si deve collegare il pin Not Chip Select 20 ed il pin di programmazione 18 a massa. The other confusing thing is that you say you program the “high half” of the – but pin 19 A10 is linked to ground. The Bytesaver card only uses eproms, but I’ve managed to create a socket adapter to use ‘s instead.

I tried reading a in the adapter and that didn’t work. The software suite is divided in two pieces: Hi, The other confusing thing is that you say you program the “high half” of the – but pin 19 A10 is linked to ground.

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Perhaps there are some which ignore this pin eprlm or it is a “no connect” pin. So it seems the adapter as I originally wired it only works for ‘s. Professional tools that can do this task are really expensive.

2708 / 2704 EPROM reader / programmer

I’m still not getting this: 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….

Whilst you say your adapter works and I am not disputing this the datasheet states that pin 21 VPP should be connected to VCC for correct read operation. I’ll make up and adapter with you suggestion and try it out.

As I said I will try Dave’s suggested wiring and post results I expect it will work better. I am still a bit confused by your pin Monday September 10th, Tuesday August 5th, admin. Circuit To read 27008 eprom we eorom 10 output for the address bus, and 8 input for the data bus: To read a eprom we need 10 output for the address bus, and 8 input for the data bus: We are in the process of creating the burning part needed in our circuit board, the PIC software and the corrispondent burning utility in Python.

Originally Posted by daver2. I am not sure what the other logic does on this pin as I only located a partial schematic.

File:Intel 2708 EPROM.jpg

I did the hack in a socket between the card and chip. Pin 21 of the is Vpp which should be wired to pin 24 Vcc for normal operation. Every byte is separated by a space character.

Eeprom Posted by MikeS. It’s not what we’re saying, it’s what the respective datasheets specify. So, the pin 22that in the is the 9th address line, in the is a ground. Facebook Twitter Google Email Print.

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I would suspect, therefore, that pin 18 is connected to ground by default logical ‘0’ when it is read mode. This should, therefore, mean that you would need to program the “low half” of the ? Isn’t that what the adapter plugs into?

I should also mention that I don’t want to program the ‘s or ‘s when they are in the target system, just read is fine. Anyone know why this would be? The time now is 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.

I still don’t get how you expect one adapter to suit s and s? And I’ve used the Top programmer to program the ‘s on the pc, this works fine. Where would I connect these three pins on the or ? Data is trasmitted to the serial port as an ASCII character, representing the hexadecimal value that has been read. In my reasearch I’ve read that ‘s are pin compatible with ‘s so I figured I could use the same adapter with ‘s.

File EPROM installed in Cromemco – Wikimedia Commons

Then I just program the top half of the ‘s and they act as ‘s on the card. Forum Genres S eprom substitution, Please write us about any error, missing part or comments! But this 270 seem to work.