On Wed, 23 Jun 1999, Peter Wurmsdobler wrote:
> In fact I output 0x0 on ioport 0x2C0 (high byte) and 0x00
> on 0x2C1 (low byte of 12 bit DAC) which should correspond
> to -5 Volts. However, I measure 4.37 Volts which tells me
> that the board registers are set to 0xf and 0x00,
> respectively. What is different for a 486 in outb() ????
>
> /* this corresponds to -5 Volts on the board */
> outb( 0x00, 0x2c0 ); /* high byte of DAC0 */
> outb( 0x00, 0x2c1 ); /* low byte of DAC0 */
The only idey I have is different delay. Try to add "udelay(10) between both
outb, or use outb_p(). It may seem strange, but 486 might be faster in ISA
output than P133. Just try to play with delays on both computers.
--
Tomek
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