SD-Cart JR : MMC/SD card reader cartridge for PCjr
Overview
This repository contains the source code for the tools, boot ROM and device driver for use with the SD-Cart JR cartridge.
For more information about this cartridge and how to use it, please visit the project page.
Compilation
On a Linux or Unix system, with make, nasm and gcc in your path, it should be as simple as typing make in the base directory. YMMV.
Contents
The sdcart.sys device driver
Scans the card to find the first partition and renders it available as a DOS drive. Installation is a simple matter of adding DEVICE=SDCART.SYS to config.sys.
If you are willing to sacrifice a few kB/s of transfer speed to save memory, SDCARTL.SYS is also available. (It uses approx. 3kB in size instead of 9kB).
Starting with version 0.5, when used on DOS 3.0+, sdcart.sys supports two command-line switches:
- /Y Instead of asking, always install (Yes)
- /A Install only if a card is detected (Auto)
For intance, to always install, use this in your config.sys file:
DEVICE=SDCART.SYS /Y
Boot ROM
Boot ROM for PCjr which replaces int 13h (The BIOS disk services) to make it possible to use a card for booting as if it were a hard drive. When using this ROM, sdcard.sys is not necessary, DOS supports the card as a hard drive. Fdisk and format can even be used normally.
sdpart.com
The sdpart.com tool can display and partly decode the contents of the card's CSD and CID registers. It also shows how a card is partitioned.
The name "sdpart" implies that this should be a full partitioning tool for memory cards. In the long run it may become so, but right now, it is extremely limited. Still, it is a good tool to test if a card is compatible or it may help understand why things are not working.
Authors
- Raphael Assenat
License
GPLv2. See LICENSE for more information.