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-
- July 2, 1991
-
- I am making an intermediate release of GRINOS v0.4ß, designated N1BEE 910702.
- This release differs from N1BEE 910630 only in that the HAPN drivers are being
- included on a test basis. Therefore, the release of GRINOS-S designated N1BEE
- 910630 will remain current, as the HAPN drivers are not and will not be bound
- into the small version. A size increase of about 8K will be noted by users of
- the large version.
-
- Unfortunately, including the HAPN drivers pushed the compiler's DGROUP, which
- is made of up of initialized and uninitialized static data, past the maximum
- size limit of 64K. In order to get GRINOS to link successfully, I enabled
- the automatic far data threshold in the compiler and set it to 255 bytes.
- This moved six data items out of DGROUP. These items relate to the ttylink
- screen display, the IP router, the AX.25 driver, the DRSI driver, the 8250
- driver used by the ASY hardware type, and the SLIP driver. If bugs have
- been introduced in any of these functions by my compiler tweaking, which
- would actually surprise me, this is most likely the cause. For the sake of
- convenience, this far data threshold will also be used in GRINOS-S beginning
- with v0.5, provided that no serious problems are reported.
-
- The HAPN driver, which supports the HAPN card, is the 03-26-91 version. It
- supports selectable IRQ, even though the HAPN card is usually hardwired to
- IRQ2. Only one HAPN card can be supported by NOS at this time. The syntax
- for the attach command is:
-
- attach hapn <baseio> <IRQ> ax25 <label> <rxbuffersize> <mtu> <duplex> <IPaddr>
-
- The <IPaddr> is optional and will default to the main IP address if omitted.
- An example of a standard attachment would be:
-
- attach hapn 0x310 2 ax25 ha0 2048 300 csma
-
- (Please note that IRQ2 is not recommended in an AT-class machine with a 16-bit
- bus due to the motherboard's use of it for the cascade interrupt. Hardware
- IRQ9 is remapped to IRQ2 for EGA and some VGA cards, which use it for their
- vertical retrace interval signal.)
-
- -- Mike Bilow, n1bee@n1bee.ampr.org
-