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- 10/03/94
- After looking after this column for almost two years the time has come to hand
- over to 'fresh blood' in the form of Dave Walker. Thanks to everyone who's
- written in over the past two years about the column.
-
- Alan Glover
-
- Introductions dispensed with, I'll say 'thank you' to Alan, and wish him best
- of luck.
-
- Monitors
- ~~~~~~~~
-
- It is possible to connect VGA and SVGA monitors to Archimedes equipped with
- RISC OS 3.1; however, only a subset of the total number of screen modes will
- be available. This means that some programs which are not written to be screen
- mode-independent will present an unusable display. Acorn's multiscan monitors
- (the AKF50 and AKF52) can display all screen modes except Mode 23, which is
- designed for use with high resolution mono monitors.
-
- Monitors with a 15 pin VGA style connector can be connected to an older Acorn
- computer's 9 pin output using a suitable adaptor available via your Acorn
- dealer.
-
- After a power-on or machine reboot, your machine performs the Power-On Self
- Test (POST), which includes a complete memory and video test. Users with VGA
- and SVGA monitors, or owners of pre-Archimedes 540 machines who have fitted a
- VIDC Enhancer, may find that their machine fails the POST occasionally; some
- monitors take several seconds to synchronise, and some VIDC enhancers may
- start up with VIDC clocked at 36MHz when POST expects 24MHz. Errors generated
- by this test produce a blank red screen and a "morse code" pattern blinking
- out on the floppy drive light.
-
- You can disable the VIDC check and the long RAM test by setting bit 7 of byte
- 188 (&BC) in CMOS RAM. This can be done with a BASIC program:
-
- SYS 6,161,188 TO ,,A%: REM read the value
- SYS 6,162,188,(A% OR 1<<7): REM write it back with bit 7 set
-
- If you need to perform a complete machine reset (delete-power on), you will
- have to run this program again to reset the relevant bit.
-
-
- New Products and Upgrades
- ~~~~~~~~~~~~~~~~~~~~~~~~~
-
- PocketFS version 2: £9.95
- TCP/IP release 2 : £116.33 single-user
- £59.95 (network version upgrade from release 1; return
- original disc with order)
- £39.99 (single-user version upgrade from release 1; return
- original disc with order)
- VLSI Floating-point coprocessor (FPA10) data sheet: £10
-
- Prices include VAT, postage and packing. Cheques should be made payable to
- "Acorn Direct".
-
- The products are available from:
-
- Vector Services
- 13 Dennington Road
- Wellingborough
- Northamptonshire NN8 2RL
-
-