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Warnings about Fortran-20 V10
1.0 KNOWN BUGS AND DEFICIENCIES
2.0 MANDATORY PATCHES FOR RELATED PRODUCTS
2.1 Required Microcode
Microcode version 326 or later must be used with Fortran V10 and LINK
V6. This microcode properly handles global byte pointers, which are
used extensively by runtime programs generated by Fortran.
2.2 TOPS-20 V5.1 SPR 20-19299, PCO 20-MONITO-555
PCO-MONITO-555 fixes the following problem:
If a non-zero section is created with SMAP%, but no pages are created in
that section, the SSAVE JSYS would fail to record the empty section in
the directory area of the .EXE file. Consequently, the program would
fail with an '?Illegal memory read' when that section was referenced.
Since Fortran-20 creates just such a section whenever /EXTEND is used
and no DATA statement initializes any .LARG. variable, there is a high
probability that this problem would appear with Fortran programs unless
the patch is entered.
2.3 TOPS-20 Splice Fork JSYS
Autopatch Tape #8 contains a patch to Tops-20 V5.1 which allows LINK to
use the SPLFK% JSYS. This JSYS is used to prevent the creation of a
temporary EXE file during the linking process. While the creation of
this EXE file does no harm, it does take up disk space.
3.0 KNOWN DEFICIENCIES IN RELATED PRODUCTS
3.1 DDT Version 43 With Tops-20 Release 5.1
DDT version 43 was written for Tops-20 release 6.0, and was not intended
for use with release 5.1. Thus, use of DDT V43 with Tops-20 release 5.1
3.2 Swap Space
The disk swap space will be used at a greater rate when /EXTEND programs
are executed. The system administrator should consider increasing the
swap space if several multi-section programs are to be executed.
3.3 Memory Cache Page Clashing
The memory caching algorithm on a 2060 can cause 'page clashing', or the
assignment of the same physical memory location to more than one virtual
memory location. This could cause programs to run much slower. A cure
is to re-arrange the allocation of memory used by programs (e.g. shift
the .LARG. psect up one section).
This is not a problem on the 2065.
[End of FORTRA.BWR]