Apple-2-HW/micro-sci-a2-controller
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# Micro-SCI / Franklin Apple ][ Floppy Drive Controller # Weyoun
This is a clone of the Micro-SCI / Franklin floppy drive controller. ![usci](usci.png?raw=true "usci")
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) Weyoun is a clone of the Micro-SCI / Franklin floppy drive controller.
v0.2 has the following enhancements over the original design: ## Features
## Revision history
Weyoun 1 was 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)
Weyoun 2 had the following enhancements over the original design:
* the 2708 EPROM has been replaced with a more-common 2716/2732 EPROM * the 2708 EPROM has been replaced with a more-common 2716/2732 EPROM
* decoupling capacitors have been added * decoupling capacitors have been added
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* ground pours used to increase operational stability * ground pours used to increase operational stability
* support for using Floppy Emu in dual-drive emulation mode with one cable * support for using Floppy Emu in dual-drive emulation mode with one cable
v0.3 has the following enhancements over v0.2: Weyoun 3 has the following enhancements over Weyoun 2:
* a 74LS245 octal buffer has been added to the data bus, to facilitate the use of a no-slot clock under the firmware EPROM * a 74LS245 octal buffer has been added to the data bus, to facilitate the use of a no-slot clock under the firmware EPROM
* the EPROM has been changed from 2716/2732 to 2764/27128/27256 to allow a no-slot clock to be placed in the socket without modification * the EPROM has been changed from 2716/2732 to 2764/27128/27256 to allow a no-slot clock to be placed in the socket without modification
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Firmware images can be built via the Makefile in the firmware subdirectory. The build framework requires cc65. Firmware images can be built via the Makefile in the firmware subdirectory. The build framework requires cc65.
![usci](usci.png?raw=true "usci")
## EPROM bank select switches (J4) ## EPROM bank select switches (J4)
* 1:off 2:off - firmware "put jumpers here" splash screen (0x0300) * 1:off 2:off - firmware "put jumpers here" splash screen (0x0300)
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## Construction notes ## Construction notes
* J3 can be omitted if this controller is used with a FloppyEmu * The second floppy drive header (J3) can be omitted if this controller is used exclusively with a FloppyEmu. Populate R11 and connect pins 1 and 2 on J7.
* All discrete logic ICs (except U15, the 74LS373) can be CMOS (74ACT, 74HCT). As is unfortunately usual with the Apple ][, U15 must be LS due to timing issues. * All discrete logic ICs (except U19, the 74LS245) should be CMOS (74ACT, 74HCT). As is unfortunately usual with the Apple ][, U15 must be LS due to timing issues.
* if CMOS logic is used, then Q1/R6/R7 can be omitted -- the entire logic array can remain powered up at all times. Connect pads 1 and 3 on the Q1 footprint.