Apple-2-HW/micro-sci-a2-controller
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Document more changes for v0.2

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Christopher RYU 2023-07-18 14:44:17 +09:00
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@ -4,7 +4,15 @@ This is a clone of the Micro-SCI / Franklin floppy drive controller.
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)
v0.2 replaces the 2708 EPROM with a more-common 2716/2732 EPROM.
v0.2 has the following enhancements over the original design:
* the 2708 EPROM has been replaced with a more-common 2716/2732 EPROM
* decoupling capacitors have been added
* footprints for all capacitors and resistors have been modernized
* firmware EPROM bank selection jumpers replaced with a DIP switch
* obsolete MPS-U51 transistor replaced with modern equivalent
* clearly-maked calibration test points have been added
* ground pours used to increase operational stability
Firmware images can be built via the Makefile in the firmware subdirectory. The build framework requires cc65.