They were initially released into public in —07 and they are still in intensive development. After plugging you simply load it again from the command line. SYS is just and outdated rebrand of usbaspi. Developed by Panasonic in …, latest version seems to be 2. Most of them support only storage devices in one exception also mouse, in one other reportedly all and they are not intended to be a general drivers for all USB disks. It means you can plug and remove flashdisks without restarting, you can manipulate with content of the flash disk even on another computer and plug it back. Project site and download:
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This also makes filesystem flaws see  worse. What is important – the modules for input devices mouse, keyboard and joystick and printers are fully working ready for every day use and transparent to DOS so everything works like normal legacy devices.
Unplugging the device may terminate a driver deadloop, or not. A good resource about first generation USB drivers is here: It means you can plug and remove flashdisks without restarting, you can manipulate with content of the flash disk even on another computer and plug it back.
Not all USB host controller cards and chips are supported. Can be booted from floppy or CD.
Obviously, such a behaviour is a fault of the device, and a bad sign for usability in DOS. Most of them support only udse devices in one exception also mouse, in one other reportedly all and they are not intended to be a general drivers for doss USB disks. Any issues not working for your USB device may be reported to the developer and maybe he can provide an improved version. SYS is just and outdated rebrand of usbaspi.
USB in DOS
Devices revealing this problem by the activity light for example different colour for USB 1 vs USB 2 mode exist but are very rare. Obviously this is a driver bug, an incompliant or defective USB device or transfer errors should dkse be able to cause such effects. The lowlevel part is called sbp2aspi and the highlevel nj32disk.
It works only ueb USB 1 mode. Workarounds worth to try:. There is also a lot of other mostly old open source DOS related software on his website. They are comparable, both provide not only USB storage support but also USB keyboards, mice, printers and other devices.
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Most USB storage devices have some activity light revealing that a data transfer vos running. But obtaining much less in not that uncommon and can have various reasons: There are various open bugs the author is aware of, and should be fixed in next version: No USB hub support.
SYS itself is English.
If it seems persistent, following reasons are possible: This is a problem mostly occurring in Win XP. Recent Comments Forum is back again.
Interesting DOS programs
If it seems persistent, following reasons are possible:. USB protocols are intended to be safe, and to recover from errors by resending data blocks that seem to have got lost or corrupted. It is not only the mass storage driver but general low level driver for USB devices with various addons sub support special devices like storage, printers, mouse, keyboard etc.
Developed by Panasonic in …, latest version seems to be 2.
There are various open bugs the author is aware of, and should be fixed in next version:. There exist several generations of USB interfaces: A good but rarely implemented idea is to additionally reveal speed mode USB 1 or USB 2for example by colour, or distinguish reads from writes.
Of course a slow hard disk used as source or destination for copying will also ruin the performance. Also fragmentation and low free space can cause an additional slowdown. They are supposed to work only with some specified hardware by one manufacturer. On this page… uusb.