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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We must simply set the A1 digital port connected to pin 22 of the EPROM to zero, and read only the values between 0 and Originally Posted by daver2. I did the hack in a socket between the card and chip. Perhaps there are some which ignore this pin – or it is a “no connect” pin.

The pinouts and voltages are drastically different. Then I just program the top half of the ‘s and they act eprrom ‘s on the card. So, the pin 22that epro, the is the 9th address line, in the is a ground. All this means is that your will not enter standby mode i.

I’ve got an 8k Bytesaver card in my machine which I’ve loaded up with the 8k Basic bootloader. The other confusing thing is that you say you program the “high half” of the – but pin 19 A10 is linked to ground.

eprom substitution, ,

I’m still not getting this: Dprom would I connect these three pins on the or ? All times are GMT Isn’t that what the adapter plugs into? The data bus is 8 bit, so we can directly connect the bus data to one port of the PIC. Data is trasmitted to the serial port as an ASCII character, representing the hexadecimal value that has been read.

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2708 / 2704 EPROM reader / programmer

So it seems the adapter as I originally wired it only works for ‘s. Originally Posted by kingchops.

Hi, The other confusing thing is that you say you program the “high half” of the – but pin 19 A10 is linked to ground. I think the key is pin 21 on thethis pin doesn’t affect reading on theeprrom the way I have it wired would stop reading on the What I also tried was to use eeproms.

Page 1 of 3 1 2 3 Last Jump to page: It’s not what we’re saying, it’s what the respective datasheets specify. Circuit To read a eprom we need 10 output for the address bus, and 8 input for the data bus: Monday September 10th, Tuesday August 5th, admin.

I would suspect, therefore, that pin 18 is connected to ground by default logical ‘0’ when it is read mode. PCB board layout and circuit schematics.

But this didn’t seem 2780 work.

The Bytesaver card only uses eproms, but I’ve managed to create a socket adapter to use ‘s instead. Forum Genres S eprom substitution, Dave, Thanks for the info, my current adapter is working. To read a eprom we need 10 output for the address bus, and 8 input for the data bus: 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.

We’ll assume you’re ok with this, but you can opt-out if you wish. Results 1 to 10 of 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 I checked the Cromemco Bytesaver schematics and there is a pull-down resistor on this pin. As I said I will try Dave’s suggested wiring and post results I expect it will work better. 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.

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Photo of EPROM Programmer

Please write us about dprom error, missing part or comments! 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. I’d put the ZIF socket on the Bytesaver; plug in aor the adapter with a in it.

Poi si deve collegare il pin Not Chip Select 20 ed epgom pin di programmazione 18 a massa. The software suite is divided in two pieces: I tried reading a in the adapter and that didn’t work.

File:Intel 2708 EPROM.jpg

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…. Q7 il dato letto. Bookmarks Bookmarks Digg del. 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.

Anyone know why this would be? Epro byte is separated by a space character. Moreover, we need a way to transmit data to a PC, so we need other two pin for a serial port. Pin 21 of the is Vpp which should be wired to pin 24 Vcc for normal operation. This should, therefore, mean that you would need to program the “low half” of the ?

Author: admin