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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Monday September 10th, Tuesday August 5th, admin. I appreciate the input and don’t get me wrong I accept what you guys are saying.
2708 / 2704 EPROM reader / programmer
But this didn’t seem to work. We’ll assume you’re ok with this, but you can opt-out if you wish. The other confusing thing is that you say you program the “high half” of the – but pin 19 A10 is linked to ground.
Serial port to be used on the PC, speed and connection epdom, the number of readings and the file name to save the dump can be changed editing the header of the Python code. What I also tried was to use eeproms. Page 1 of 3 1 2 3 Last Jump to page: I tried reading a in the adapter and that didn’t work. 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 Moreover, we need a way to transmit data to a PC, so we need other two pin for a serial port.
I would suspect, therefore, that pin 18 is connected to ground by default logical dprom when it is read mode. So, the pin 22that in the is the 9th address line, in the is a ground.
I can program the ‘s using the Top, that works fine, but when I use them in the 27088, the Altair doesn’t read them. Every byte is separated by a space character.
And I’ve used the Top programmer to program the ‘s on the pc, this works fine. Pin 21 of the is Vpp which should be wired to pin 24 Vcc for normal operation. As I said I will try Dave’s suggested wiring and post results I expect it will work better.
The time now is I think the key is pin 21 on thethis pin doesn’t affect reading on thebut the way I have it wired would stop reading on the Hi, The other confusing thing is that you say you program the “high half” of the – but pin 19 A10 is linked to ground.
File:2708 EPROM installed in Cromemco Bytesaver.jpg
Either way – you may find some manufacturer’s devices may not work epprom. Please write us about any error, missing part or comments! I have a 2k monitor program eprok the top 1k of two ‘s, in two sockets each with an adapter, and the program runs as 2k of continuous memory.
I did the hack in a socket between the card and chip. To read a eprom we need 10 output for the address bus, and 8 input for the data bus: Results 1 to 10 of Data is trasmitted to the serial port as an ASCII character, representing the hexadecimal value that has been read. Sorry, your blog cannot share posts by email. It’s not what we’re saying, it’s what the respective datasheets specify. Professional tools that can do this task are really expensive. Circuit To read a eprom we need 10 output for the address bus, and 8 input for the data bus: Q7 il dato letto.
sprom Perhaps there are some which ignore this pin – or it is a “no connect” pin. We must simply set the A1 eprm port connected to pin 22 of the EPROM to zero, and read only the values between 0 and 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 front panel switches are all still good and working, but I can tell some of the most used switches like examine next and deposit are starting to get sprom little worn out.
Thread Tools Show Printable Version. Pin 19 of both the and is address line A10 so you can wire this to ground pin 12 to use the first half of the device or pin 24 Vcc eproj use the second half of the device. Facebook Twitter Google Email Print.
So it seems the adapter as I originally wired it only works for ‘s. Originally Posted by kingchops. I would also break out pin I checked the Cromemco Bytesaver schematics and there is a pull-down resistor on this pin.
eprom substitution, ,
The Bytesaver card only uses eproms, but I’ve managed to create a socket adapter to use ‘s instead. In my eorom I’ve read that ‘s are pin compatible with ‘s so I figured I could use the same adapter with ‘s.
Where would I connect these three pins on the or ?