Troubleshooting

2.Some overruns are caused by SMARTDRV write caching. To dis- able write caching but continue read caching, specify the drive letter without a + or -. For example, SMARTDRV C enables read caching but disables write caching. Note, however, that this will slow the PC down.

3.Remove the DOS=HIGH statement from CONFIG.SYS as it causes interrupts to be delayed longer. Note that this will take up precious CONVENTIONAL memory space.

4.An ill-behaved TSR may be contributing to the problem. If so, try to isolate it by removing all TSRs then adding them back one at a time.

5.Run in standard mode. Windows stops virtualizing I/O and there is less overhead.

6.Remove the SOUNDS.DRV driver (which enables a variety of sounds from your PC speaker) if it is present, as this disables inter- rupts while activated.

Other things you could try are listed below.

●Check that you are using the Windows versions of EMM386, HIMEM.SYS and SMARTDRV, and not the DOS versions.

●Don't run multiple disk-caching programs.

●In CONFIG.SYS, set FILES to 30 or higher.

●Check that you have SHELL=COMMAND.COM / E:2048 /P i.e. 2K environment.

●If Windows hangs, increase the stacks to 64,512. The recommenda- tion is 0,0.

●Check that your TEMP variable points to a subdirectory that actually exists and that there are at least 2 megabytes free on the disk.

●Check that EMMExclude=A000-EFFF, otherwise Windows will interfere with (DOS) high memory when it shouldn't.

●For bizarre problems, disable shadow RAM. If this rectifies the prob- lem, upgrade your BIOS.

●Disable hardware cache in caching disk controller.

●If you are using V3.1 of Windows communication drivers then try using a serial port with a 16550 UART.

Note: Microsoft has produced a document called CE_OVERRUN Errors with Serial Communications which can be obtained by contacting Microsoft and asking for document number Q79988.

A-4

07W & -11W, 05W specifications

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Xerox 05W, 07W & -11W manual Troubleshooting

Models: 07W & -11W 05W

Troubleshooting

07W & -11W, 05W specifications