Okay. Let's see if I can answer all these in order.
-- Tom
1) Yes, I am getting my images from here: https://tobylobster.github.io/rom_library/
Also, I'm going for the ones with the little green check marks, so I assume those are the good ones.
2) Sadly, I don't have sideways ram at the moment. Long story. I have a Sidewise board, but there was a battery leak and the RAM isn't being recognized.
I did load several of the images I was using into an emulator however, and Hopper does work. The rest don't. So that was at least part of my problem. I've since downloaded a few new ROMs, including WordWise, which all work in the emulator.
3) Will try ROM Tool. In case it wasn't clear, I'm new to EPROMs. So this is all a learning experience.
-- SKS1
4) Admittedly, I haven't tried this. However, Promshell has an erase verify function and I do check the erased chip prior to burn.
-- Mark
5) Believe it or not, a modified cellphone sanitizer. It was a gift from a friend of mine, and he uses a similar device as well. Usually it takes about 10 minutes for an erase cycle (there's an auto timer), and the chip will verify as erased after. Typically, however, I will give it a second or third go to be sure though.
6) Yes it has a window.
7) Yes. As mentioned,Promshell has an erase verify function and the chip is verified as erased prior to burn.
8 ) For the most part, no. there have been a few fails, but I erase and start over when that happens. Honestly, this is all more than 40-year-old equipment, so I expect a few hiccups along the way.
That said, when I do get a successful burn, I usually repeat the process 3 to 4 times to be sure and verify the contents after.
-- David
9) The chip is a 27128, not a 27c128. But yes it's real and extracted from an old… Honestly I don't know what it was. Some sort of industrial equipment that ended up at a local recycler. They allowed me to extract all the socketed ICs and this chip was amongst them. There was another 27128a as well, but it won't erase with the equipment I have. I just assumed it was dead.
There were 11 2764 chips as well, but my "original" copy of WordWise was on a 27128, so I figured I should stick with the same chip.
I should also note that the 27128a is the only chip that fails to erase according to Promshell. Everything else erases as expected. Aside from the afore mentioned 2764s, I have almost a dozen 2516s, 2716s, and a few 2732s as well. All of ferrying make (most are Texas Instruments), and all are sourced from local vintage equipment.
As for the chip I'm using, It also appears to erase properly, and obviously, WordWise (a 16k file) was not its original content.
As for everything else, since Hopper does work in an emulator, but not when written to my EPROM, I must conclude that there is a likely translation issue here.
To test this, I took the WordWise file I dumped and attempted to put it into my emulator and it gives me an error. My WordWise file is apparently 2 bytes too long for the emulator. 16386 bytes vs the 16384 bytes that the emulator will accept.
Previously, I used my Promenade to dump other ROMs (from some of that industrial equipment to see what it was) and some kind folks over at the Vintage Computer Federation forum were able to be read the images and disassembled for identification. Turns out it was some sort of pump system that used a z80 processor.
That's it. That's where I stand. If anyone knows how to convert the files so my Promenade can successfully write them it would be appreciated.
-- Tom
1) Yes, I am getting my images from here: https://tobylobster.github.io/rom_library/
Also, I'm going for the ones with the little green check marks, so I assume those are the good ones.
2) Sadly, I don't have sideways ram at the moment. Long story. I have a Sidewise board, but there was a battery leak and the RAM isn't being recognized.
I did load several of the images I was using into an emulator however, and Hopper does work. The rest don't. So that was at least part of my problem. I've since downloaded a few new ROMs, including WordWise, which all work in the emulator.
3) Will try ROM Tool. In case it wasn't clear, I'm new to EPROMs. So this is all a learning experience.
-- SKS1
4) Admittedly, I haven't tried this. However, Promshell has an erase verify function and I do check the erased chip prior to burn.
-- Mark
5) Believe it or not, a modified cellphone sanitizer. It was a gift from a friend of mine, and he uses a similar device as well. Usually it takes about 10 minutes for an erase cycle (there's an auto timer), and the chip will verify as erased after. Typically, however, I will give it a second or third go to be sure though.
6) Yes it has a window.
7) Yes. As mentioned,Promshell has an erase verify function and the chip is verified as erased prior to burn.
8 ) For the most part, no. there have been a few fails, but I erase and start over when that happens. Honestly, this is all more than 40-year-old equipment, so I expect a few hiccups along the way.
That said, when I do get a successful burn, I usually repeat the process 3 to 4 times to be sure and verify the contents after.
-- David
9) The chip is a 27128, not a 27c128. But yes it's real and extracted from an old… Honestly I don't know what it was. Some sort of industrial equipment that ended up at a local recycler. They allowed me to extract all the socketed ICs and this chip was amongst them. There was another 27128a as well, but it won't erase with the equipment I have. I just assumed it was dead.
There were 11 2764 chips as well, but my "original" copy of WordWise was on a 27128, so I figured I should stick with the same chip.
I should also note that the 27128a is the only chip that fails to erase according to Promshell. Everything else erases as expected. Aside from the afore mentioned 2764s, I have almost a dozen 2516s, 2716s, and a few 2732s as well. All of ferrying make (most are Texas Instruments), and all are sourced from local vintage equipment.
As for the chip I'm using, It also appears to erase properly, and obviously, WordWise (a 16k file) was not its original content.
As for everything else, since Hopper does work in an emulator, but not when written to my EPROM, I must conclude that there is a likely translation issue here.
To test this, I took the WordWise file I dumped and attempted to put it into my emulator and it gives me an error. My WordWise file is apparently 2 bytes too long for the emulator. 16386 bytes vs the 16384 bytes that the emulator will accept.
Previously, I used my Promenade to dump other ROMs (from some of that industrial equipment to see what it was) and some kind folks over at the Vintage Computer Federation forum were able to be read the images and disassembled for identification. Turns out it was some sort of pump system that used a z80 processor.
That's it. That's where I stand. If anyone knows how to convert the files so my Promenade can successfully write them it would be appreciated.
Statistics: Posted by DistantStar001 — Thu Mar 27, 2025 11:00 pm