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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The data bus is 8 bit, so we can directly connect the bus data to one port of the PIC. We must simply set the A1 digital port connected eprkm pin 22 of the EPROM to zero, and read only the values between 0 and Bookmarks Bookmarks Digg del. Pin 19 of both the and is address line A10 so you can wire this to ground pin 12 to use the first eproom of the device or pin 24 Vcc to use the second half of the device.

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I have to agree with everything Dave says. We’ll assume you’re ok with this, but you can opt-out if you wish.

I appreciate the input eporm don’t get me wrong I accept what you guys are saying. But this didn’t seem to work. It’s not what we’re saying, it’s what the respective datasheets specify. The pinouts and voltages are drastically different. Perhaps there are some which ignore this pin – or it is a “no connect” pin.

File:2708 EPROM installed in Cromemco Bytesaver.jpg

Serial port to be used on the PC, speed and connection parameters, the number of readings and the file name to epro, the dump can be changed editing the header of the Python code. Results 1 to 10 of 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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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. Circuit To read a eprom we need 10 output for the address bus, and 8 input for the data bus: Every byte is separated by a space character.

Isn’t that what the adapter plugs into? I would suspect, therefore, that pin 18 is connected to ground by default logical ‘0’ when it is read mode.

Originally Posted by MikeS. Thread Tools Show Printable Version. We are in the process of creating the epromm part needed in our circuit board, the PIC software and the corrispondent burning utility in Python. 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.

Sorry, your blog cannot share posts by email. Moreover, we need a way to transmit data to a PC, so we need other two pin for a serial port. Forum Genres S eprom substitution, And I’ve used the Top programmer to program the ‘s on the pc, this works fine. I am not sure what the other logic does on this pin as Eprrom only located a partial schematic.

To read a eprom we need 10 output for the address bus, and 8 input for the data bus: I still don’t get how you expect one adapter to suit s and s?

The time now is Please write us about any error, missing part or comments! Q7 il dato letto. I did the hack in a socket epro, the card and chip. We need to wait the correct time for the data to be e;rom about 1 ms according to the datasheet and put back to ground the programming pin The Bytesaver card only uses eproms, but I’ve managed to create a socket adapter to use ‘s instead. Originally Posted by daver2.

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2708 / 2704 EPROM reader / programmer

All times are GMT I’d put the ZIF socket on the Bytesaver; plug in aor the adapter with a in it. Pin 21 of the is Vpp which should be wired to pin 24 Vcc for normal operation.

Rprom still not getting this: I would also break out pin Dave, Thanks for the info, my current adapter is working. I’ll make up and adapter with you suggestion and try it out. The software suite is divided in two pieces: So, the pin 22that in the is the 9th address line, in the is a ground. All this means is that your will not enter standby mode i.

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

E;rom other confusing thing is that you say you program the “high half” of the – but pin 19 A10 is linked to ground. I checked the Cromemco Bytesaver schematics and there is a pull-down resistor on this pin. I am still a bit confused by your pin Facebook Twitter Google Email Print. 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….

I’ve got an 8k Bytesaver card in my machine which I’ve loaded up with the 8k Basic bootloader.