Stari1
Newbie
Dear Forum Members,
I am looking for a solution in the topic below.
I would like to read program from a HD404222 CMOS 4-bit Single-Chip Microcomputers and write to a new empty HD404222.
I have already checked the datasheet of the IC (uploaded) and created a socket adapter to the reading/programming(writing).
Furthermore, I bought an Prom writer to the project.
XGecu T48 [TL8663G]
The datasheet contains description to the programing (programing like a 27C256 eprom), but the socket adapter built by me not suitable for reading and writing in the practice. The programmer does not indicate an error, but it cannot read the correct values (it reads 1F from all memory address).
I tried to contact Hitachi Japan and then Hitachi USA, but I got no answer.
It would be nice to know if there is an original Hitachi socket adapter for the HD404222 or the exact resistance and diode values for the legs O5, O6, O7, A13, A14.
(Theoretical socket adapter circuit diagram for HD4074224 uploaded.)
Thanks in advance and Best Regards!
I am looking for a solution in the topic below.
I would like to read program from a HD404222 CMOS 4-bit Single-Chip Microcomputers and write to a new empty HD404222.
I have already checked the datasheet of the IC (uploaded) and created a socket adapter to the reading/programming(writing).
Furthermore, I bought an Prom writer to the project.
XGecu T48 [TL8663G]
The datasheet contains description to the programing (programing like a 27C256 eprom), but the socket adapter built by me not suitable for reading and writing in the practice. The programmer does not indicate an error, but it cannot read the correct values (it reads 1F from all memory address).
I tried to contact Hitachi Japan and then Hitachi USA, but I got no answer.
It would be nice to know if there is an original Hitachi socket adapter for the HD404222 or the exact resistance and diode values for the legs O5, O6, O7, A13, A14.
(Theoretical socket adapter circuit diagram for HD4074224 uploaded.)
Thanks in advance and Best Regards!