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31 lines
1.2 KiB
Markdown
31 lines
1.2 KiB
Markdown
# AppleIISd
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SD card based ProFile replacement for enhanced Apple IIe computers
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The **AppleIISd** is an SD card based replaced for the ProFile harddrive. In contrast to other SD card based cards this card does not replace a Disk II drive. Data is saved directly onto the SD card, it is not via images on a FAT system, like on other cards. The SD card is read- / writable with CiderPress.
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A Xilinx CPLD is used as a SPI controller and translates, together with the ROM driver, SD card data to/from the Apple IIe. The VHDL source is based on [SPI65/B](http://www.6502.org/users/andre/spi65b) by André Fachat.
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The assembler sources are written in Merlin-8.
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## Features
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* up to 128MB storage space (4x 65535 blocks), currently 32MB
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* ProDOS driver in ROM
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* Auto boot
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* Access LED
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## Requirements
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The AppleIISd requires and has been tested on an enhanced IIe computer. The ROM code uses some 65c02 opcodes. ProDOS versions 1.1 to 2.4.1 seem to work.
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## TODOs
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* Much more testing
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* Support more than one partition
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* Implement card detect and write protect sensing
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* Use 7MHz clock as SPI clock
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* SRAM option (may never work, though)
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* Find a use for the IRQ pin
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* Support other EPROMS than 2716 and 2732
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