SD card based ProFile replacement for IIe

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README.md

AppleIISd

SD card based ProFile replacement for enhanced Apple IIe computers

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.

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 by André Fachat.

The assembler sources are written in Merlin-8.

Features

up to 128MB storage space (4x 65535 blocks), currently 32MB
ProDOS driver in ROM
Auto boot
Access LED

Requirements

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.

TODOs

Much more testing
Support more than one partition
Implement card detect and write protect sensing
Use 7MHz clock as SPI clock
SRAM option (may never work, though)
Find a use for the IRQ pin
Support other EPROMS than 2716 and 2732