2708 EPROM PDF

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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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I still don’t get how you expect one adapter to suit s and s? The data bus is 8 bit, so we can directly connect the bus data to one port of the PIC. Pin 21 of the is Vpp which should be wired to pin 24 Vcc for normal operation. I am not sure what the other logic does on this pin as I only located a partial schematic. All this means is that your will not enter standby mode i. So it seems the adapter as I originally wired it only works for ‘s.

Originally Posted by daver2. Forum Genres S eprom substitution, To read a eprom we need 10 output for the address bus, and 8 input for the data bus: 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 to use the second half of the device.

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. The pinouts and voltages are drastically different.

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The Bytesaver card only uses eproms, but I’ve managed to create a socket adapter to use ‘s instead.

Sorry, your blog cannot share posts by email. All times are GMT Data is trasmitted eeprom the serial port as an ASCII character, representing the hexadecimal value that has been read.

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.

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 a little worn out. I have to agree with everything Dave says. I would suspect, therefore, that pin 18 is connected to ground by default logical ‘0’ when it is read mode.

Perhaps there are some which ignore this pin – or it is a “no connect” pin. Q7 il dato letto. And I’ve used the Top programmer to program the ‘s on the pc, this works fine. What I also tried was to use eeproms. Then I just program the top half of the ‘s and they act as ‘s on the card. 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. We’ll assume you’re ok with this, but you can opt-out if you wish.

Originally Posted by MikeS. Results 1 to 10 of The time now is I tried reading a in the adapter and that didn’t work.

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File:Intel 2708 EPROM.jpg

I appreciate the input and don’t get me wrong I accept what you guys are saying. Bookmarks Bookmarks Digg del.

Moreover, we need a way to transmit data to a PC, so 208 need other two pin for a serial port. Please write us about any error, missing part or comments! Circuit To read a eprom we need 10 output for the address bus, and 8 input for the data bus: Professional tools that can do this task are really expensive.

I checked the Cromemco Bytesaver schematics and there is a pull-down resistor on 2078 pin.

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Originally Posted by kingchops. I’ve got an 8k Bytesaver card in my machine which I’ve loaded up with the eporm Basic bootloader. Dave, Thanks for the info, my current adapter is working. This should, therefore, mean that you would need to program the “low half” of the ?

But this didn’t seem to work. I’m still not getting this: So, the pin 22that in the is the 9th address line, in the is a ground. I did the hack in a socket between the card and eprkm. Facebook Twitter Google Email Print. Monday September 10th, Epfom August 5th, admin. 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. Thread Tools Show Printable Version.