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The project is based on the knowing of internal structure of UniDisk 3.5 drive, it uses same HW of Apple II machines. It is a smart device built by controlled drive board powered by
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>65c02 mp @2.0 MHz (model GTEu G65SC02P-2 CMOS 8bit 2MHz PDIP40) with 2KB StaticRAM (model HITACHI HM6116LP-2 CMOS 8bit 120ns PDIP24) and 8KB PROM IWM Floppy disk controller (model VLI VF4060-001 344-0041-B IWM PDIP28) plus 527 byte of I/O peripheral registers, all addressing by memory mapped method.
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>65c02 mp @2.0 MHz (model GTEu G65SC02P-2 CMOS 8bit 2MHz PDIP40) with 2KB StaticRAM (model HITACHI HM6116LP-2 CMOS 8bit 120ns PDIP24) and 8KB ROM (model A2M2053-V1.0 TC5365P-8718 250ns PDIP28) plus 527 byte of Gate array I/O peripheral locations plus 15 byte of IWM registers in IWM Floppy Disk Controller PROM (model VLI VF4060-001 344-0041-B IWM PDIP28), all addressing by memory mapped method.
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The UniDisk 3.5 drives can use directly by Apple //c with 3.5 ROM (ROM version 0) or by Apple IIe or an II Plus using special interface controller card aka "LIRON card".
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