#8 pin eeprom programmer software#
which says that EEPROMs sometimes come with the software data protection on, so I tried writing it exactly as specified, but it still doesn't work. I sent the EEPROMs to a friend and he was able to write to them just fine (he has an official programmer), I can only read them succesfully (he wrote something to them for me), but never write to them. programmer, I also copied the schematic from it exactly, and it still doesn't work. I have now copy-pasted the code from this. Hello guys, sorry for the late reply, I was on vacation. It sounds like a fun project.Īlso, if you are designing the circuit yourself, the Z-80 requires pullups on the NMI and other pins. I still have the whole mess in a box in my basement. I don't recall if I used a cross assembler on a PC or a Z-80 emulator called Z-80MU. Add a coin cell and a little logic and you could keep your RAM/ROM for years. Hell, now that I think about it, you could easily write a small bootloader ROM for your Z-80, download the hex file and write protect the RAM, skipping the Arduino entirely. Set everything to outputs on the Arduino, load the RAM, protect it and switch to inputs. That would be so east to implement with an Arduino. I could develop the application very quickly.
I flipped the switch that write protected the RAM chip and released the bus.
#8 pin eeprom programmer serial#
I pressed a reset button and downloaded the hex files over the serial port which got stored in the right location. I flipped a switch on the "bootloader" I made which pulled BUSRQ on the Z-80 low and took control of the bus. The low address chip was wired as a ROM and I had built a circuit that had a 8 bit UART chip, some counters, data latches and timing logic. I had no EPROM programmer so I bought 8K x 8 CMOS static RAM chips. This is what I did when I built my single board Z-80 back in the last century. Hey nerdoface, I can't help you on your programmer because I think your problem is solved.
Is there anything obviously wrong with it? (I didn't because my native language isn't English, so I have to translate all the function and variable names before I can post the code).
#8 pin eeprom programmer full#
I also left the shift register code out, but will post the full code if needed. Of course there is also a setup function and an io_output function and stuff like that. Note that I didn't include all of my code, just the relevant parts. Here is my code (or some of it, at least): I can read back is 255 (the default value for this EEPROM). The problem however, is that I can't seem to get the programming code to work. I proceeded to write some code, and I verified my shift register control code was working with some LEDs. The control pins of both the shift registers and the EEPROM are also connected
The data lines are connected directly to the arduino. The Arduino controls 2 shift registers, which control the address lines of the EEPROM. So I took an Arduino Nano and some shift registers and tried to build a programmer. So I want to build an 8-bit computer based on the Z80, and needed and EEPROM programmer, and since I am cheap I looked at the datasheet and decided I should be able to build one myself.
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