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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Originally Posted by MikeS. Perhaps there are some which ignore this pin – or it is a “no connect” pin. In my reasearch I’ve read that ‘s are pin compatible with ‘s so I figured I could use the same adapter with ‘s.

I’d put the ZIF socket on the Bytesaver; plug in aor the adapter with a in it. 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.

/ EPROM reader / programmer | Museo dell’Informatica Funzionante

We need rprom 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 And I’ve used the Top programmer to program the ‘s on the pc, this works fine.

This should, therefore, mean that you would need to program the “low half” of the ? 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 time now is Results 1 to 10 of I’ve also loaded the Altair Rom written by John Garza which enables deposit and examine of memory from a terminal, as well as the sprom Basic loader and a few other great features. I’ve got an 8k Bytesaver card in my machine which I’ve loaded up with the 8k Basic bootloader.


File:2708 EPROM installed in Cromemco Bytesaver.jpg

Where would I connect these three pins on the or ? Facebook Twitter Google Email Print. So it seems the adapter as I originally wired it only works for ‘s. I would also break out pin Page 1 of 3 1 2 3 Last Jump to page: So, the pin 22that in the is the 9th address line, in the is a ground. 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 appreciate the input and don’t get me wrong I accept what you guys are saying. I am not sure what the other logic does on this pin as I only located a partial schematic.

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 would suspect, therefore, that pin 18 is connected to ground by default logical ‘0’ when it is read mode. The software suite is divided in two pieces: Pin 21 of the is Vpp which should be wired to pin 24 Vcc for normal operation.

I did the hack in a socket between the card and chip. Originally Posted by daver2.

File EPROM installed in Cromemco – Wikimedia Commons

Isn’t that what the epeom plugs into? 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. 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. Dave, Thanks for the info, my current adapter is working. 270 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 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.

Thread Tools Show Epro, Version. Bookmarks Bookmarks Digg del. Please write us about any error, missing part or comments! Hi, The other confusing thing is that you say you program the “high half” of the – but pin 19 A10 is linked to ground. Professional tools that can do this task are really expensive.

PCB board layout and circuit schematics.

Moreover, we need a way to transmit data to a PC, so we need other two pin for a serial port. I am still a bit confused by your pin epromm 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.

File:Intel 2708 EPROM.jpg

The data bus is 8 bit, so we can directly connect the bus data to one port of the PIC. It’s not what we’re saying, it’s what the respective datasheets specify. I’ll make up and adapter with you suggestion and try it out.