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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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. Professional tools that can do this task are really expensive.
But this didn’t seem to work. Data is trasmitted to the epom port as an ASCII character, representing the hexadecimal value that has been read.
Facebook Twitter Google Email Print. Originally Posted by kingchops. 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.
This should, therefore, mean that you would need to program the “low half” of the ? 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. I have to agree with everything Dave says. 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. Page 1 of 3 1 2 3 Last Jump to page: All this means is that your will not enter standby mode i.
So, the pin 22that in the is the 9th address line, in the is a ground.
eprom substitution, ,
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…. We’ll assume you’re ok with this, but you can opt-out if you wish. Epro, tried reading a in the adapter and that didn’t work.
The software suite is divided in two pieces: Results 1 to 10 of Moreover, we need a way to transmit data to a PC, so we need other two pin for a serial port. Every byte is separated by a space character. Perhaps there are some which ignore this pin – or it is a “no connect” pin.
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 Pinout is the same but the address bus, that is 9 bit instead of 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.
What I also tried was to use eeproms.
Photo of EPROM Programmer
Anyone know why this would be? The pinouts and voltages are drastically different. Thread Tools Show Printable Version. 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 The data bus is 8 bit, so we can directly connect the bus data to one port of the PIC.
The Bytesaver card only uses eproms, but I’ve managed to create a socket adapter to use ‘s instead. I did the hack in a socket between the card and chip. Pin 21 of the is Vpp which should be wired to pin 24 Vcc for normal operation.
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 would suspect, therefore, that pin 18 is connected to ground by default logical ‘0’ when it is read mode.
2708 / 2704 EPROM reader / programmer
I would also break out pin Originally Posted by daver2. Isn’t that what the adapter plugs into? So 27088 seems the adapter as I originally wired it only works for ‘s.
Poi si deve collegare il pin Not Chip Select 20 ed il pin di programmazione 18 a massa. Either way – you may find some manufacturer’s devices may not work i. Dave, Thanks for the info, my current adapter is working. Hi, The other confusing thing is that you say you program the “high half” of the – but pin 19 A10 is linked to ground. To read a eprom we need 10 output for the address bus, and 8 input for the data bus: Where would I connect these three pins on the or ?
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 4k Basic loader and a few other great features.