On 4/17/2025 8:18 PM, John Robertson via Jukebox-list wrote:
On 2025-04-17 4:46 p.m., Tony Miklos via Jukebox-list wrote:
On 4/17/2025 3:17 PM, NORMAN MACRAE wrote:
Hi Tony Milos,
About twenty months ago you posted about an NSM ES2 where you were having difficulty programming the EA ROM - did you ever resolve that?
I am working on a City2 where I cannot access the program. I thought it may have been set with a secret code so I got another EA ROM but I still cannot access the program.
Thanks in advance for any insight, Norman.
I never found anyone who programs them. I believe they have an internal battery and even if they are NOS, they are due to fail at any time. If there is a big enough call for it, someone might figure out how to program a newer IC and make it work, but it doesn't look like anyone has much interest in the task. I'm turning down jobs on them now. They are turning into big paper weights. Good luck, let me know if you ever find a solution.
What is the problem people are running into with the ES-II computers? I can program the 2732 EPROM easily enough...I think I have a test bed as well for the CPU...maybe.
John :-#)#
I forget the IC location and part number, but it's not an EPROM. I take it as if it has some kind of program, maybe a key of sorts, and an internal battery holds the memory and now they are all dying off. I think I have a good one, well if it's still good... I'll try to get the part number. The blank IC's are still found here and there but who knows how old they are and when their internal battery will quit.