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Sound card for MS-Dos 6.xx (Users)

posted by RayeR Homepage, CZ, 07.12.2010, 15:38
(edited by RayeR on 07.12.2010, 15:58)

> If you have such MOBO available or may borrow it you can try it and let us
> know.5.3.1 ISA Bus
I quickly found one from KONTRON that may have CUSTOM support for LPC2ISA. This is written in manual:

The ETX-DC® is usually equipped with a PCI2ISA bridge which does not support DMA transfers; therefore e.g. the floppy interface of an external SuperI/O controller is not supported. Optionally a LPC2ISA bridge can be equipped as a customized version of the product, but then there is only very limited memory access on ISA bus possible.

But it seems that LPC2ISA bridge suffers with low bandwith/big latency that make it useless for realtime controll and I have a suspection it may also affect sound quality - audiable jitter, sound lags and quirks...

# Sometime after the Intel 815 chipset era, motherboards no longer have an ISA bus built into the chipset; the ISA bus has been replaced with the nominally compatible Low Pin Count bus used only for communications between the chipset chips and CPU. A newer motherboard's serial port, for example, connects to the processor via the LPC bus; as far as Windows is concerned, however, it still appears as an ISA device.
# Some newer motherboards (particularly those targeted to the embedded market) are specified as having an ISA or PC/104 connector, but these are almost always generated from the LPC bus with an LPC-to-ISA bridge chip. The LPC bus is a hybrid serial/parallel bus that collapses the ISA bus from 98 pins to 10 pins. The bridge chips expand the LPC packets back into a fully parallel 98-pin bus. For most desktop applications, these chips can work fairly well.
# Unfortunately, in real time applications, we have found that some of the bridge chips do not work well. In testing several different ISA and PC/104 servo interface cards, the PC stops responding to the card's interrupts within a few seconds or a minute. We have also had reports that some I/O cards may not work reliably with these bridge chips, as well.
# We and some of our customers have tested motherboards using the IT8888 or IT8889 LPC-to-ISA bridge chip; none of these have worked for real time control. Winbond also makes a bridge chip, the W83626, but we have not encountered a motherboard yet that uses it.

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DOS gives me freedom to unlimited HW access.

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