Instructables

Poll:Do you use an EPROM PROGRAMMER?

1.Do you have an eprom programmer? 2.Have you recently used or thought about using an Eprom in a project? 3.If you don't have an eprom programmer, would you be interested in Making or having one? 4.Do you think eproms are obsolete? 5.Can you think of a use for an eprom? 6.Are eproms too unusual to use in a Make or Instructable project?

onkelf5 years ago
sometimes. stole about 30 27c512 eproms so I've been programming som nes games on the eproms.
I am trying to reprogramj some of these chips wi8trh tke willem pcb5 with no louck. I programed some before but I caqn't fi8nd the coorect jumper conf. again . Can you help me ?
ljuben4 years ago
 i have  SEEPROG programation and  a memory ship who dont work and i dont know have to put a new information and to get working.and the problem is how du i put some information on my computer then in the new one.PS.some one help me or tell me how to get it write

ljuben4 years ago
 i have  SEEPROG programation and  a memory ship who dont work and i dont know have to put a new information and to get working.and the problem is how du i put some information on my computer then in the new one.PS.some one help me or tell me how to get it write

 I know the electrically alterable devices are cool, but there is a warm fuzzy feeling I get when I put the opaque tape over the window and I know my bits are safe. At least it is more efficient than driving to culver city with a papertape.

I am into vintage machines and eproms are widely used in the original hardware.

I haven't actually used one in a decade, but I think fondly of them as I have used them over the course of my career for 6502, 8085, 80186...

Making SCSI boot roms for Apple ][ hard disk adapters was fun.
glenncw5 years ago
I have been trying to use a willem programmer to program a 2732 chip for my car. Unsuccessly I might add.
hawksting6 years ago
I currently have a few reclaimed EPROMs sitting on my desk that I'd like to use for a retro/restoration project. I'm going to have to borrow a burner, as I do not own one. It seems that EPROMs can still be recovered easily from older equipment...in the days when manufacturers used IC sockets.
Scucci6 years ago
I use my Eprom programmer at least 3 times a week. I'm currently restoring a Tron arcade machine right now. It was converted to Two Tigers, so I bought an Eprom programmer and eraser and converted it back to Tron by programming some blank eproms. I had to do that because of how hard it is to find original chips that haven't suffered bit rot. They might be considered obsolete, but for some projects for those of us that don't throw everything away in favor of new technology, they're still very important.
westfw Scucci6 years ago
Ahh. Arcade game restoration. That makes a lot of sense! (Post some instructables on the topic!)
Scucci westfw6 years ago
Not interesting enough... atleast Tron isn't. But I should be getting an empty Robotron cabinet soon... and possible a broken Asteroids that would make much better topics.
110100101106 years ago
implement in software > flash/eeprom > eprom > duct tape
lewinskys6 years ago
I restore old Arcade Video and Pinball machines, so I use my Epprom programmer and UV eraser a lot.
1.No 2.Yes 3.Yes 4.Yes 5.Yes 6.Maybe ...
Witte7 years ago
I often use my Eprom Programmer to update existing Eproms. Therefore I can say that for service reasons, Eproms are still important.

But for developing new devices, most companies are using Flash Eproms or using microcontrollers with embedded flash memory.
westfw7 years ago
1) I have a Needhams EMP-10 (20?), and I've used and/or have access to a bunch of others. 2) Haven't used an UVEPROM in many years. 4) I think they're pretty obsolete. In most cases you can get flash or eeprom in similar size and package at similar prices, and serial eeprom MUCH cheaper. 5) Um, I can think of some apps for parallel DIP-28/DIP-32 Non-volatile memory, but none that require UVEPROM. 6) You can publish with a note to the effect that parallel eeprom or flash or even NVSRAM can be used instead to cover some bases, but... buying obsolete tech (both chip and perhaps programmer) can be painful. NVSRAM is common in the dumpsters I frequent. :-)
VIRON (author)  westfw7 years ago
I sometimes use them for unintended purposes, often more convenient and even faster than serial memory. They are cheap and free in dumpsters and clearly for ROM like uses, but I don't see as many NVSRAM there. EPROMS were cheaper than but useable as PALs GALs and CUPL. (Is CUPL still expensive?) One example of an EPROM project is a frequency counter using a binary counter and the EPROM as a multiple digit binary-7seg converter. No microcontroller needed. Counts much faster than a basic stamp. Another example (similar circuit) is video animation or test patterns. I was just wondering if there were a lot in everyone else's junkbox for projects like that. Oh, I have a few programmers, the EMP-10 happens to be the last one I got. I like the convenience of telling DOS to generate a special hex file for me as needed, something which I don't know what else can do it that's "new" and cheap. The first two I built myself, and I also built a PIC1654 programmer because it was cheaper to do than whatever the dev kit costed then. "I wish" someone could tell me how to do things as fast on new computers as old ones, but "I doubt" it, since the old ones even boot faster, with average only 1 MIPS. If the PC's died, we could bootstrap an APPLE I and APPLE II in a day or so, just with eproms, batteries, switches, and lights. (In other words, EPROMS are nice if need to start from scratch.) We once bootstrapped a 6809 through the joystick ports of an Atari 400, (burning it's eprom) which had a dot matrix screen made of rotating LED displays of the kind we now call "POV", cute sounds, and a surplus TI-99-4A keyboard. Oh, and when we goofed up our EPROMs, well we had a bunch, and we'd place them overnight on top of a UV bug-zapper-lamp to clear them. :0
westfw VIRON7 years ago
You can do a multi-digit decode with an 8bit-wide EPROM? I do have a fair set of EPROMs in my junk box, but I'm afraid it's unlikely to be "typical" anymore. To get things to go as fast on new computers as old ones, reduce memory and disk size to the minimum required and revert to a command-line interface instead of using a GUI. For instance, things like tomsrtbt boot and run very fast, even from a CD...
VIRON (author)  westfw7 years ago
Multi-digit decode: Lets say you have a 27512 and want 8 digits. Use the lowest bits as part of the LED cathode selector. Fill the eprom with segment patterns like 00000000 00000001 00000002 Put the binary number you want displayed in decimal on the higher address bits. oops...27512 only leaves enough bits to go up to 00008192, so use a bigger eprom. When writing a basic program to make the hex file, leave out the zeros on the left if you want. POV or "multiplexing" is happening here like on old Sinclair calculators. Another use besides frequency readout is digital meters. (But ICL7107 is cheap, and so are already made meters, so it would be good for a custom nonlinear scale.)
I was thinking of making one, but decided that it would probably be best to try and buy one that allows more types of chips to be programmed. Right now I have my eye on this eBay Seller and waiting to save up the extra money...
twoedge7 years ago
I remember burning EPROMs for VT100 monitors in the mid-80s. I thought it was kinda mystical placing the EPROMs in the uV lamp eraser. I still have a few of the EPROMs on my desk stacked next to a Pentium chip, some vacuum tubes, a 14" hard drive platter and some saved viruses on write-protected floppy disks.
ian7 years ago
Why not? These are almost antiques, eh? It seems everything is using cheaper EEPROM and flash now. I have personally never been exposed to this type of chip, all my uCs are EEPROMs or flash memories.