sqpat
Experienced Member
I have a few identical AST 286 motherboards, but I am missing keyboard microcontrollers on two of them. They are 8742 (P8742AH) microcontroller chips.
I have a USB programmer but it does not support these - my understanding is that with a Willem programmer and an MCS-48 adapter it is possible to dump and write the contents of these. Or if it's not possible to dump, at least it may be possible to write a generic AT keyboard microcontroller's code to one and I can probably use that.
I have four windowed intel D8742 EPROMs I can supply, as well as one of the original AST keyboard controllers to read from. I'd like that the contents be read from the existing controller, saved (so we can upload that online) and then copied to the D8742s. I only need two, but I can't really test if the EPROMs are good to begin with, so I figure I may as well send all four I have here.
I am in the Pacific Northwest and I think it would be most simple to send this back and forth by mail to anyone in the US.
This is a little outside of my knowledge range so if I am wrong about some details please let me know. (For instance, if a D8742 cant be substituted for a P8742AH, or something...)
I have a USB programmer but it does not support these - my understanding is that with a Willem programmer and an MCS-48 adapter it is possible to dump and write the contents of these. Or if it's not possible to dump, at least it may be possible to write a generic AT keyboard microcontroller's code to one and I can probably use that.
I have four windowed intel D8742 EPROMs I can supply, as well as one of the original AST keyboard controllers to read from. I'd like that the contents be read from the existing controller, saved (so we can upload that online) and then copied to the D8742s. I only need two, but I can't really test if the EPROMs are good to begin with, so I figure I may as well send all four I have here.
I am in the Pacific Northwest and I think it would be most simple to send this back and forth by mail to anyone in the US.
This is a little outside of my knowledge range so if I am wrong about some details please let me know. (For instance, if a D8742 cant be substituted for a P8742AH, or something...)