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Philip Smart
2023-04-18 10:47:13 +01:00
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A Floppy Disk Interface card for the Sharp MZ series of machines (MZ-80B/MZ-80A/MZ-700/MZ-800/MZ-1500/MZ-2000/MZ-2200).
This project is based on an iconic floppy disk interface card from the 1980's by the Aachen based company, Kersten & Partner GmbH. The company produced two cards,
the SFD-700 for the Sharp MZ-700 and the SFD-800 for the Sharp MZ-800. I initially reproduced the SFD-800 from the original schematic and board which I owned, the
design can be seen here: https://eaw.app/sfd800/. The SFD-800 was quite a flexible design and worked in the MZ-80B/MZ-800/MZ-1500/MZ-2000/MZ-2200 computer. Unfortunately
it didnt cater for the Sharp MZ-700 or indeed the Sharp MZ-80A.
the SFD-700 for the Sharp MZ-700 and the SFD-800 for the Sharp MZ-800.
I considered reproducing the SFD-700 exactly but it wouldnt work in an MZ-80A which uses a hardware trick to address the CPU speed shortcomings. I thus decided, based on the
SFD-800, to create a version 2 of the SFD-700 design which would work in all the Sharp MZ series computers.
Owning an original SFD-800, I reproduced the SFD-800 from the original schematic and the design can be seen here: https://eaw.app/sfd800/. This card has been well
tested and as the SFD-800 was quite a flexible design, it also worked in the MZ-80B/MZ-800/MZ-1500/MZ-2000/MZ-2200 computers. Unfortunately it didnt cater for the Sharp MZ-700 or indeed the Sharp MZ-80A.
To address the requirement of a floppy interface for the Sharp MZ-700 and MZ-80A, I considered reproducing the SFD-700 exactly but analysis showed it wouldnt work in an MZ-80A which uses a hardware trick to
address the CPU speed shortcomings. I thus decided, based on the SFD-800 schematics, to create a version 2 of the SFD-700 design which would work in all the Sharp MZ series computers.
Please see my website (in due course), https://eaw.app for more documentation and any recent updates.