UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post

retrotecchie · 17th Dec 2018, 6:12 pm

Hi all

Just found a 2011 thread about the old Maplin Z80A single board computer.

I have just been handed a box of 'stuff' from my old employers who were throwing out some old junk and in the box was one of these Maplin Z80 CPU boards.

Now, back in 1992 or so, I did some development work and built some control equipment based on these boards. I was hoping this was one of the original boards with the original Maplin M12 EPROM, but it turns out to be a 'modified' board with the custom EPROM I burned for that particular project!

Well, I can't find a copy of the original ROM anywhere. I have plenty of blank 2716s and there was also an EPROM programmer in amongst the junk, so I have the means to blow a new ROM. Has anyone out there still got one of these with the original M12 (not the later MS12) ROM to work with the hex keypad and 7 segment display.

I'd be happy with a copy of the EPROM (I can supply a blank 2716 or even copy a chip if you don't have a programmer) or can enter it by hand from a hex dump if anyone has one?

Thanks

Mike

17th Dec 2018, 6:12 pm	#1
retrotecchie Retired Dormant Member Join Date: Dec 2018 Location: Lampeter, Ceredigion, UK. Posts: 5	Maplin Z80 CPU card Hi all Just found a 2011 thread about the old Maplin Z80A single board computer. I have just been handed a box of 'stuff' from my old employers who were throwing out some old junk and in the box was one of these Maplin Z80 CPU boards. Now, back in 1992 or so, I did some development work and built some control equipment based on these boards. I was hoping this was one of the original boards with the original Maplin M12 EPROM, but it turns out to be a 'modified' board with the custom EPROM I burned for that particular project! Well, I can't find a copy of the original ROM anywhere. I have plenty of blank 2716s and there was also an EPROM programmer in amongst the junk, so I have the means to blow a new ROM. Has anyone out there still got one of these with the original M12 (not the later MS12) ROM to work with the hex keypad and 7 segment display. I'd be happy with a copy of the EPROM (I can supply a blank 2716 or even copy a chip if you don't have a programmer) or can enter it by hand from a hex dump if anyone has one? Thanks Mike