Color Computer CoCo SDC, Manual

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2 | Chapter 1
CoCo SDC Revision 3 Board.
Also on board is 128K of Flash memory
which is divided into 8 banks of 16K. These
16K banks are both hardware and software
selectable and occupy the cartridge ROM space
from $C000 to $FEFF.
One bank of the Flash memory is used to
hold the SDC-DOS code which is yet another
patched version of Microsoft’s Disk Extended
Color BASIC 1.1. Included in SDC-DOS are
additional commands to mount disk image files
on the SD card, program the Flash and execute
ROM images contained in the Flash. Drivewire
disk support is also included in SDC-DOS.
Features and Specifications
• Atmega 328P AVR micro controller @ 10Mhz
• Custom 512 byte boot-loader allows firmware
to be updated by the CoCo
• 128K In-System-Programmable Flash
• Accepts SD/SDHC cards formatted with
FAT16 or FAT32 file system
• Emulates a Tandy Floppy Disk Controller
• Emulate Dragon DOS floppy controllers
• LBA access mode for virtual hard disk
support
• Extensions to Disk BASIC in SDC-DOS for
disk image manipulation
• Drivewire disk protocol with auto-speed
configuration for CoCo 1, 2 or 3
• “Disk Switch” button to support multi-disk
programs
• PCB can be mounted in a Tandy FD-502
enclosure
Hardware Guide
SD Card Direction.
The SD card socket is a Push-Push type. When
removing the card, always push in to release
the latching mechanism before sliding the
card out. Never use force to pull the card out
of the socket. The card must be inserted into
the socket upside-down (label facing down,
contacts facing up). Use only SD or SDHC
cards with the CoCo SDC.