Apple-2-HW/micro-sci-a2-controller
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Christopher RYU 2023-08-25 11:42:20 +09:00
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README.md
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@ -15,6 +15,14 @@ v0.2 has the following enhancements over the original design:
* ground pours used to increase operational stability
* support for using Floppy Emu in dual-drive emulation mode with one cable
v0.3 has the following enhancements over v0.2:
* a 74LS245 octal buffer has been added to the data bus, to facilitate the use of a no-slot clock under the firmware EPROM
* 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
* all logic chips, except the 74LS245 at U19, can and should be 74HCT/74ACT to reduce power consumption to a fraction of the original design
* the transistor that switched the +5VDC power line for half of the board has been eliminated -- with CMOS, the board can stay powered at all times
* the circuit board layout has been streamlined in alignment with the above bullet points
Firmware images can be built via the Makefile in the firmware subdirectory. The build framework requires cc65.
![usci](usci.png?raw=true "usci")

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