25 lines
923 B
Markdown
25 lines
923 B
Markdown
# Brother Pattern Programming Devices
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Various electronic experiments with pattern programming on Brother knitting machines.
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## brothercart
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Reverse engineering of the Stitch Pattern Cartridge II.
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This card is equipped with 32KB RAM and 32KB ROM.
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The ROM is an EPROM without erase window and probably contains some built-in
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knitting patterns. The RAM can be programmed freely.
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To ensure data retention on the RAM chip, there is a huge 3V lithium battery
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soldered onto the PCB. There is also some discrete logic to support memory
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bank switching (probably).
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## emulator
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A re-implementation of the memory cartridge with a microcontroller, an SPI
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flash chip (optional, 64KB..512KB), and a microSD card slot.
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The cartridge memory bus is directly attached to the microcontroller.
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Memory access will not be as fast as the original RAM and ROM, so make sure
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not to run the bus faster than the microcontroller can feed data.
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