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PCMCIA A-To-D Card Locks Up During Acquisition

On some laptops running Windows XP (notably the "Toshiba Satellite Pro") the AD136 card may lock up when you press the "Go" button on the AD125 Demo application. Lockups may also occur with custom applications.

This laptop's default configuration causes the ADxxx card to be given a shared PCI interrupt rather than a non-shareable "ISA" IRQ. The AD125 application does not have an interrupt handler associated with it, so when the "Go" button is pressed, the data acquisition process causes an "IRQ storm" where the unhandled PCI interrupt runs away and locks up the PC.

Get Around

The solution is to disable PCI shared IRQ's for PCMCIA cards. This is accomplished by setting the registry key "DisableIsaToPciRouting" to a value of 1.

Install this registry file to do this (extract the reg file and double click on it), then reboot your PC.