10 Oct
2005
10 Oct
'05
3:38 p.m.
On 10/10/05, ROBO5.8 <robo58 at optonline.net> wrote:
Hi Folks,
I recently obtained a used E&L Instruments MT-80Z microprocessor trainer.
My goal is to teach my kids a little about microprocessors.
The trainer has 3 empty IC sockets U1-40 pin, U10-40 pin and U-11-28 pin.
The parts are missing on the board that contains the keyboard and 7 segment
displays. Neither of which work, so I suspect those empty sockets require a
chip or two for operations.
The parts are probably Zilog or Intel PIO's and a CTC (Counter Clock Timer).
Good guess. U10 is an optional PIO. U11 is an optional CTC. U1 is
where the Z80 goes in the MPF-1. On the MT-80Z the Z80 is moved to
the second PCB and U1 is empty on the original PCB.
Schematics for the original MPF-1 board can be found here:
http://themotionstore.com/leeedavison/z80/mpf1/index.html
I have never found an online schematic or manual for the MT-80Z. The
monitor EPROM in the MT-80Z I have is slightly different than the
monitor EPROM in the MPF-1, but I think the changes are very minor.