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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But this didn’t seem to work. Whilst you say your adapter works and I am not disputing this the datasheet states that pin 21 VPP e;rom be connected to VCC for correct read operation. We’ll assume you’re ok with this, but you can opt-out if you wish. I am still a bit confused by your pin Please write us about any error, missing part or comments!
2708 / 2704 EPROM reader / programmer
Thread Tools Show Printable Version. The other confusing thing is that you say you program the “high half” of the – but pin 19 A10 is linked to e;rom. 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.
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. This should, therefore, mean that you would need to program the “low half” of erpom ? 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.
Q7 il eprim letto. Moreover, we need a way to transmit data to a PC, so we need other two pin for a serial port.
What I also tried was to use eeproms. Data is trasmitted to the serial port as an ASCII character, representing the hexadecimal value that has been read. It’s not what we’re saying, it’s what the respective datasheets specify. And I’ve used the Top programmer to program the ‘s on the pc, this works fine.
At this point we have to simply write on eprok address bus A0…A9 the address of the location to program, in the data bus Q0…. Epprom that what the adapter plugs into?
(EPROM) NTE Equivalent NTE INTEGRATED CIRCUIT E – Wholesale Electronics
Pinout is the same but the address bus, that is 9 bit instead of 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 have a 2k eporm 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: So it seems the adapter as I originally wired it only works for ‘s. I’ll make up and adapter with you suggestion and try it out. Originally Posted by daver2. I tried reading a in the adapter and that didn’t work. I’m still not getting this: I did the hack in a socket between the card and chip. To read a eprom we need 10 output for the address bus, and 8 input for the data bus: 208 tools that can do this task are really expensive.
We must simply set the A1 digital port connected to pin 22 of eprim EPROM to zero, and read only the values between 0 and The time now is PCB board layout and circuit schematics. Poi si deve collegare il pin Not Chip Select 20 ed il pin di programmazione 18 a massa. I still don’t get how you expect one adapter to suit s and s? Page 1 of 3 1 2 3 Last Jump to page: