Special thanks to Paul Marwick of 3: What is the lastest release? Toggling the panel “off” using LS-5 does not entirely defeat the CPU overhead required to service the panel. The last released driver in the open beta scheme was version 1. Special terms cover use of BNU, BNU beta test versions, any accompanying programs including any supplied source code and its documentation in commercial environments.

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Without the support of these people, I would have given up long ago.

BNU Fossil Driver FAQ

The software’s programmers only needed to talk to the serial driver in a standardized way to send and bju their data. Only that code which is actually used and plays a part in support of the multitasker itself is loaded. The last released driver in the open beta scheme was version 1. However, interrupt sharing will be supported in a future release.


BNU is not provided with a warranty of any kind, including, but not limited to fitness for any particular purpose or consequential loss. These machines ran some form of DOS Disk Operating System and their BIOS provided very poor support for serial communications—so poor that it fell far short of the needs of any non-trivial communications task. Only strictly BIOS-compliant programs will benefit.

This page was last edited on 25 Juneat By default, the “refresh rate” of the panel s is set to 0, which means it is refreshed EVERY timer tick, or at a rate of about Having serial port support as provided by BNU and other similar drivers allowed the communications software programmers to spend more time on the actual applications instead of the depths and details of how to talk to the serial ports and the modems connected to them.


It also eliminates code made redundant by not having all multitasker time slice resident at once, irrespective of which specific multitasker is in use. The design of the AT bus prevents any two cards from using the same interrupt.

A major benefit of this is that BNU can be loaded before any environment variables are set, and bnj takes up the absolute minimum of RAM. All articles with specifically marked weasel-worded phrases Articles with specifically marked weasel-worded phrases from April All stub articles.

Those specifically interested in testing the driver and reporting problems were allowed access. You can help Wikipedia by expanding it. What is the lastest release? When the AT machine was released, a second interrupt controller was added to service another 8 interrupt levels; and the upper 8 bnk “cascaded” into the first interrupt controller’s IRQ 2.

I ask only that the terms of the original distribution be honoured – that is, do not make it available for file request or download and do not transmit it fosil any other authomated means ie.

Almost all serial cards are 8-bit only, and a bit card is required to support the upper 8 interrupt levels available on AT class machines.

It will also include a developers package and an interface library with sources and the new API specification. Refresh rates of 1 means every second tick, 2 every third, 3 every fourth, and so on.


This switch MUST be used exclusive of all others. Add to this, the sum of the transmit and receive buffers times the number of communications ports selected.

Even when the serial ports in question are built onto the same card, very few cards support their use on the same IRQ, and this is almost always mentioned very specifically as a feature of the card. If the documentation does not metion IRQ sharing, then it almost invariably won’t work.

Sending communications data across a modem link was a lot more involved than sending data to a serial printer which was basically all that was originally capable of being done with the existing serial port bhu support. Although undocumented, BNU provides for locked baud rates at both and baud: If diagnostics are used rarelythen add 1K.

BNU (software)

Note that the background screen is NOT restored since it is never saved. If not, it resets the INT 14H address to the correct location.

All property rights are retained by the owner. FOSSIL drivers have also been implemented to support other communications hardware by making it “look like a modem” to the application.

This eliminates much of the unnecessary “baggage” suffered by users of BNU who do not need this feature.

Particular fields to look at are: