If I … There's no magic numbers around 6000 so I doubt it's a wiring issue.What happens if you start at higher addresses? I was thinking recently about OR gates. Since the Arduino doesn’t have enough pins to directly control all of the address, data, and control lines of the EEPROM, two 74HC595 shift registers are used for the 11 address lines (15 for the 28C256) and the output enable control line.There are four different Arduino sketches that correspond to several YouTube videos. 4 comments. Many people are learning, like I did, about computer hardware by following Ben Eater’s 8-bit breadboard computer build. */ void setAddress (int address, bool outputEnable) Am I missing anything by using the TL866 programmer with Minipro software or is the purpose of the Arduino programmer more of an interesting project than a better option?Thanks for this, I tried adding the disable writes last night with no luck, I’ll take a look at yours tonightDid you figure out how to or are you asking for help or what?Code and schematics at the links in my comment above.Totally unrelated, but what are you using to create the schematic?I was looking into building a more permanent programmer on a perfboard that can also handle larger eeproms, I'll definitely check your blog post. But with only 16 bytes of memory it’s not really usable for any kind of real world tasks. But the computers I loved as a kid had high-resolution displays, and keyboards, and joysticks attached. Only recently found Ben's YouTube channel and bought a 6502 kit (that I really don't need) and an EEPROM programmer (that I do need for parallel chips) to support his great work. The makerom.py script works like a charm but the nano_programmer.py it's not working. I’ve been breadboarding a Z80 computer lately. Thanks!KiCAD for schematics. That software, along with the EEPROM programmer’s hardware are described in detail in the following video. Learn how computers work by building and programming your own with these educational videos and kits. And we explored a few of the Z80s opcodes by manually feeding them into the data pins. eeprom programmer, because i dont want to spend $60 on it. Many people are learning, like I did, about computer hardware by following Ben Eater’s 8-bit breadboard computer build. I also wanted to be able to create a small, self contained Z80 machine including both input and output devices. There’s a much larger This is a simple circuit for programming the 28C16, 28C64, 28C256, and similar parallel EEPROMs using an Arduino. Most people use this board to run RomWbW but I have different plans …. There's a semi-regular theme on here of people buying a 28C256 EEPROM and finding out that the Software Data Protection is enabled and they can't work out how to disable it.So I updated my Ben Eater EEPROM programmer to use the 28C256 and wrote the code to disable SDP, or to write to the chip while SDP is enabled.I've also modified the code to run a lot faster - I'm seeing the full 32Kb being written in about 15 seconds.The code also includes an updated routine to program the 7-segment display driver EEPROM so it blanks the leading zeros and moves the negative sign next to the numbers.All code should still work with the original programmer for writing 28C16 chips but the wiring will need to be updated to reroute the control signals for the EEPROM.Blog article describing the hardware changes and SDP code is at Something I saw on your page and you kind of noted this.
Just my $0.02 :).Just curious. Use Git or checkout with SVN using the web URL. But, in that process I did build my own version of Ben's EEPROM programmer for the 8-bit project. I've read on this subreddits that chip fakes are common so im a bit worried about that. Only recently found Ben's YouTube channel and bought a 6502 kit (that I really don't need) and an EEPROM programmer (that I do need for parallel chips) to support his great work. and am looking … After giving you a general tour of the ALU of the Bentium Pro and the carry select circuitry I want to move onto describing the flags register and how the flags are evaluated. I used your clearEEPROM function to write 0x55 to all addresses in the EEPROM, and it works for about the first 6000 addresses, then it looks like it start getting noise. I create tutorial-style videos about electronics, computer architecture, networking, and various other technical subjects. We use cookies to ensure that we give you the best experience on our website. The code in /eeprom-programmer is the basic programmer that programs a few bytes into the EEPROM and dumps the contents. I recently upgraded my RC2014 to use the 512K ROM 512K RAM board available on Tindie). I did not do the controller because I never put all of the boards together to work together but I was mostly interested in experimenting on how each of the chips worked. Learn how computers work by building and programming a computer with the classic 6502 microprocessor. Thanks in advance.New comments cannot be posted and votes cannot be castPress J to jump to the feed. Press question mark to learn the rest of the keyboard shortcuts
What if you program backwards (highest address to lowest).What if you alternate between low addresses and high addresses?Have you tried adding back in some delays? And many of those are either moving on to more advanced projects or using slightly different hardware for the build.
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ben eater eeprom