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https://codeberg.org/cryu/micro-sci-a2-controller
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28 lines
1.3 KiB
Markdown
28 lines
1.3 KiB
Markdown
# Micro-SCI / Franklin Apple ][ Floppy Drive Controller
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This is a clone of the Micro-SCI / Franklin floppy drive controller.
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v0.1 is a direct clone, reverse-engineered from a Micro-SCI board. It was cross-checked with a Franklin-branded board, as well as the (belatedly discovered) official Franklin schematic (included in doc/service_and_schematics.pdf)
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v0.2 has the following enhancements over the original design:
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* the 2708 EPROM has been replaced with a more-common 2716/2732 EPROM
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* decoupling capacitors have been added
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* footprints for all capacitors and resistors have been modernized
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* firmware EPROM bank selection jumpers replaced with a DIP switch
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* obsolete MPS-U51 transistor replaced with modern equivalent
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* clearly-marked calibration test points have been added
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* ground pours used to increase operational stability
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* support for using Floppy Emu in dual-drive emulation mode with one cable
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Firmware images can be built via the Makefile in the firmware subdirectory. The build framework requires cc65.
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## EPROM bank select switches (J4)
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* 1:off 2:off - controller test firmware (0x0000)
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* 1:off 2: on - 16-sector firmware (0x0100)
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* 1: on 2:off - 13-sector firmware (0x0200)
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* 1: on 2: on - firmware "put jumpers here" splash screen (0x0300)
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