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- Frequently Asked Questions and their answers in connection with CONFIG
-
- Q) Config says my computer has a POPAD error. Is it defective, do I
- have to replace it?
- A) Under certain conditions the machine instruction POPAD does not
- restore the EAX register afterwards. The error affects only 386
- processors and was only discovered around the middle of 1990 and
- affects nearly all processors from Intel and AMD. The very newest
- versions from Intel at least have been corrected. The error is known
- to software developers and the instruction is only implemented so
- that the error does not occur. Don't worry about it, my computer has
- it too.
-
-
- Q) Why can't the chip set on my board be identified?
- A) I do not have the required information about every chip set
- available. Unfortunately I have only a limited selection.
-
-
- Q) The short interval timer on my 66MHz board is claimed not to
- work!
- A) The test does not work properly on some boards and gives false
- results. In this event the test should be deactivated with the
- switch SKIPTIMERTEST in the INI file.
-
-
- Q) Why does it only show ??? on the hard disk rotation speed test?
- A) Modern hard disks have on board caches up to 256 KB. In this case
- a whole track is read into cache per rotation, and the disk is not
- read on a repeated request.
-
-
- Q) In the memory windows areas are mentioned with 8 Bit access. I
- have a 386/486, so how come only 8 Bits?
- A) These memory areas are empty, they contain NOTHING; no RAM, no
- ROM, no HI-DOS, nothing. If these EMPTY areas are accessed, the
- access is slow and 8 bit.
-
-
- Q) It says my graphics adapter has an 8 Bit bus. It has in fact a 16
- Bit bus, I know, I have seen it.
- A) These adapters can be used in ATs as 16 Bit or in XTs with 8 Bit.
- The card decides which mode for itself. Many older cards do not
- identify the bus correctly and even when in an AT think they are in
- an XT. When CONFIG says 8 Bit, this will be correct 95% of the time.
- The speed tests will confirm it: 8 bit cards cannot exceed about 700
- KB/sec throughput in text mode.
-
-
- Q) Why are the interrupt allocations shown in the IRQ-Window as the
- standard values and not the ones actually allocated?
- A) For safety and compatibility reasons I leave the interrupt
- controller well alone.
-
-
- Q) Why does CONFIG show a higher speed for data transfer for the
- hard disk than other test programs?
- A) CONFIG tests the speed of data transfer by reading ONE track by
- increasing sector number until a maximum value is reached. With
- hard disks with hardware caches this represents more the value
- Cache->Bus->Main Memory than Disk surface->Bus->Main Memory. On
- older MFM/RLL type hard disks it shows really the speed
- Disk Surface->Bus->Main Memory.
- The test 'Linear Reading', implemented since the version 6.4
- delivers a realistic value also on newer hard disks for the transfer
- speed from hard disk to main memory.
-
-
- Q) Why are the speed values for BIOS and DOS character transfer so
- much higher when I boot the computer without any extra device
- drivers?
- A) Many device drivers such as the mouse, screen savers or memory
- managers latch into the character output routines to monitor them or
- extend their functions. This leads to a reduction in output speed.
- In addition, the functions sometimes get so big, that they don't fit
- all at once into the CPU cache any more.
-
-
- Q) Can't CONFIG display the physical parameters of IDE hard disks as
- well as the translation parameters?
- A) No.
-
-
- Q) It shows only a strange sign in the upper left corner of the
- screen and crashes.
- A) You have a S3 with 801 or 805 chip. Set VIDEOTEST=NO in .INI file.
-