Dwight Elvey
Veteran Member
Hi
I see the post about someone trying to find information for the programmer they have. It is a shame that there isn't more information for these devices.
I've had to repair my Needham PB-10 once. I realize that manufactures like to keep their schematics private but the Needham PB-10 is now, way, obsolete and no longer manufactured. No one is interested in building one today, especially with the number of cheap programmers available from China right now. I just want to be able to fix the one I have when I need to use it. I had to do a lot of signal tracing and note taking to figure the various parts out. There were even some tricky things done to the circuit to make is difficult to easily copy the hardware. Part of the lower address bits were done with a counter chip and they'd swapped a couple of the address lines, just to make it annoying. I hardly think that would stop a serious attack. It just makes it a little more trouble.
I've made a number of routines to set the various pins to values so I can look to see if anything is running slow with a scope. I did this in Forth but one could easily convert it to some other language. It is not a schematic, just what the signals do. If anyone is interested I can post this information.
Dwight
I see the post about someone trying to find information for the programmer they have. It is a shame that there isn't more information for these devices.
I've had to repair my Needham PB-10 once. I realize that manufactures like to keep their schematics private but the Needham PB-10 is now, way, obsolete and no longer manufactured. No one is interested in building one today, especially with the number of cheap programmers available from China right now. I just want to be able to fix the one I have when I need to use it. I had to do a lot of signal tracing and note taking to figure the various parts out. There were even some tricky things done to the circuit to make is difficult to easily copy the hardware. Part of the lower address bits were done with a counter chip and they'd swapped a couple of the address lines, just to make it annoying. I hardly think that would stop a serious attack. It just makes it a little more trouble.
I've made a number of routines to set the various pins to values so I can look to see if anything is running slow with a scope. I did this in Forth but one could easily convert it to some other language. It is not a schematic, just what the signals do. If anyone is interested I can post this information.
Dwight