Raspberry Pi Virtual Floppy Drive
Wednesday 23 April 2014
Percom Doubler II
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My first TRS-80 floppy disk drive was an Aerocomp branded 40 track, single sided drive. The available storage was minimal so I ended up bu...
Friday 21 March 2014
Project Update
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Full Single/Double Density Support I am now able to read double-density and mixed density disks including copy-protected disks. The DMA ra...
Sunday 16 March 2014
DMK File Viewer/Editor
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My Raspberry Pi system converts TRS-80 floppy disks to DMK files. One of the challenges of working with DMK files is ensuring that they are ...
Tuesday 11 March 2014
Board Giveaway
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I have built another PCB with improved layout and a debug pin for the logic analyzer so I am giving away my first working prototype PCB to ...
Sunday 12 January 2014
DMA Support (at last)
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The initial implementation of DMA for SPI is based on recent examples of using the Pi DMA hardware from user mode rather than from a kernel...
Wednesday 6 November 2013
Pull-up and Pull-down Resistors
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Pull-up and Pull-down It's a boring subject to some, but resistors are important for the correct operation of electronic circuits. Acc...
Tuesday 29 October 2013
Schematic and Layout (updated)
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Schematic V2 I've updated the original post with a better schematic that supports (in theory) write operation and side select for ...
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