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Changes to the Driver Architecture
In VistaScan 2.4.5 / MagicScan 4.2 or later, UMAX have stopped using the umaxis11.386
device driver and have instead adopted the Windows-standard Miniport (.mpd) architecture.
The use of MPD drivers means that the UMAX card will now appear correctly in the Windows
95/98/NT System control panel devices list. Within the MPD architecture UMAX's driver
software use ASPI-type commands for all SCSI cards, including the UDS-IS11/ISA.
Drivers Required for the Adaptec/Compatible Card
In order for the scanner driver to control a UMAX Scanner connected to an Adaptec or
compatible SCSI card, the card must appear in the System devices list and be controlled by
a Miniport driver - by default Windows 98 will install an MPD driver for any recognised
card via the Add New Hardware routine, when the card is first detected. For example the
Adaptec AHA2940AU card uses AIC78XX.MPD and IOS.VXD, which are loaded from the Windows 98
CD.
When the scanner driver is launched it performs a check of all SCSI Controllers for
recognised scanner names, then compares the scanner name with a list of supported models
encoded inside the version of VistaScan or MagicScan. Provided the scanner name is
recognised and the SCSI bus is correctly cabled and terminated (ie reliable
communication), the driver will load properly.
Provided the Adaptec/compatible card is using a Miniport driver the default installation
of the VistaScan (2.4.5 or later) or MagicScan (4.2 or later) should be able to control a
connected scanner - there is no longer any need for a Custom installation. 16-bit DOS and
early Windows 95 ASPI drivers, loaded during boot in the config.sys file, are no longer
supported.
Installation of MPD Drivers for the UMAX UDS-IS11/ISA Card
To add to the confusion over the disappearance of "Custom" installations, the
VistaScan 3.1 scanner driver automatically installs a driver for the UDS-IS11/ISA SCSI
card. The installer does not make any attempt to detect the card - if you are using an
alternative card (for example you have no free ISA slots), the UDS-IS11/ISA will still be
listed as a System device, with a warning flag (!):
The loaded UDS-IS11/ISA driver will have no effect on Adaptec/compatible card and can be
Removed from the System device list. Even when the driver is listed as a System device
VistaScan will check ALL SCSI controllers for a recognised scanner model.
Note: There is one special case where the automatically-installed UDS-IS11/ISA driver may
cause problems. If for some reason you have an Adaptec card AND a UDS-IS11/ISA card
installed, and the scanner is connected to the Adaptec card, we recommend you disable or
remove the UDS-IS11/ISA driver (or load the alternative DTC driver).
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