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- Acorn Risc PC 486 Card Windows Driver Release Notes
- ---------------------------------------------------
-
- NOTE:- These are DOS files
- --------------------------
- This archive or disk contains the standard Windows Driver (ARMDRV.DRV), this
- text file (README), and a setup file (OEMSETUP.INF) which will allow Windows
- to install the drivers for you.
-
- It is recommended that you install this driver from a DOS format
- floppy disk. To do this you will have to copy these files onto a DOS disk.
- NOTE: the OEMSETUP.INF file gets truncated to OEMSETUP/I by being archived or
- by being on a RISCOS format floppy so you will have to rename it on the DOS
- disk.
-
-
- The Windows Drivers
- -------------------
- The enhanced Windows Driver provides a substantial increase in speed for many
- common Microsoft Windows 3.0 and 3.1 drawing functions, by using the
- Archimedes as a Graphics Co-processor. It supports 16, 256, 32 thousand and
- 16 million colours in any resolution that your system can display. It
- replaces the standard VGA driver VGA.DRV. It also gives full palette support,
- so everything will have the correct colours, if a palette mode is used.
-
- The Driver supplied is:
- ARMDRV.DRV: (v1.85 1995.07.10)
- To use this driver, you will need !PC486 or !PC version 1.87g or later.
-
-
- The drivers can either be installed manually as detailed in the manual (and
- below), or you can use Windows Setup to do the job. For most users we
- recommend that you use Windows Setup, either during the initial installation,
- or after windows is installed.
-
- If you are an experienced Windows/DOS user then it is quicker to use the
- manual method, but you must be sure that your existing installation is for
- 'VGA (Version 3.0)', otherwise you will have the wrong 386-grabber installed
- and will get all sorts of display trouble with DOS boxes.
-
- After installing the driver you need to use !PCconfig to specify the RISCOS
- mode that the driver will use.
-
- The OEMSETUP/INF file supplied with this version has to assume a particular
- version of windows when prompting for floppies. This version assumes version
- 3.11 (of both Windows and Windows for Workgroups). If you have a different
- version (3.1, or 3.0), or even a version supplied by a manufacturer other
- than Microsoft then some of the files required may be on different floppies
- (particularly vddvga30.386, which is on disk1 for v3.1, and disk2 for v3.11).
- Just insert the disk containing the requested file (shown in the bottom right
- of the setup screen), rather than the prompted disk if this is the case.
- Setup will then proceed.
-
- Using Setup when installing Windows:
- ------------------------------------
- 1. Copy the ARMDRV.DRV & OEMSETUP.INF files to a dos format floppy disk,
- as detailed above - henceforth referred to as the 'Acorn Windows
- Driver' floppy.
-
- 2. Start to install Windows as described in the PC Card Manual, using the
- 'Custom Installation' option.
-
- 3. When you get to the screeen that displays your settings, do not choose the
- 'VGA (version 3.0)' display option as described in the Manual, but go to
- the bottom of the list and select the 'Other display (Requires disk from
- OEM)...' option, at the bottom of the list.
-
- 4. Insert the Acorn Windows Driver floppy into the drive, as prompted.
-
- 4. Press return to accept the default path of 'A:\' unless you have put the
- files somewhere else.
-
- 5. Select the driver.
-
- 6. Continue with the installation, supplying disks as prompted.
- You may find that some files are not on the requested disk, but on a
- different one, as not all windows releases have all the files distributed
- in exactly the same way. If so, insert the disk containing the required
- file, rather than the specified disk.
-
-
- Using Setup after Windows is installed:
- --------------------------------------
- You can change the display driver at any time by running Windows Setup either
- from DOS (with your Windows directory as the current directory) or from
- within Windows. You will also need to do this if you receive updated versions
- of the Windows Drivers.
-
- Select the 'Change System Settings...' menu item from the 'Options' menu, and
- then proceed from step 3 above (Not forgetting step 1 first).
-
- You will have to restart windows for the changes to take effect.
-
-
- Manual installation:
- --------------------
- To install the driver, first copy the driver file (ARMDRV.DRV) into your PC's
- \WINDOWS\SYSTEM directory. Next, load the file SYSTEM.INI (in your PC's
- \WINDOWS directory) into a text editor or SYSEDIT. Find the line in the
- [boot] section which reads
-
- display.drv=vga.drv
-
- and replace it with the line
-
- display.drv=armdrv.drv
-
- Don't worry if your SYSTEM.INI file has something other than 'vga.drv' after
- the '=' sign. The new driver will be used the next time you start Windows.
-
- To change the description as well as the driver (not necessary, but
- recommended) you also need to change the display.drv line in the
- [boot.description] section of the SYSTEM.INI file to:
-
- display.drv=Configurable ARM Driver (4,8,16,32 bpp)
-
-
- !PCconfig options:
- -----------------
- You need to specify the mode for the Windows Driver to use. This can be
- either a decimal RISCOS mode number, or a RISC-PC style mode specifier of the
- form x640y480c16 - Note that spaces aren't currently allowed, and neither are
- the optional eigen and refresh values). Here are the
- strings used to represent the different colour depths:
-
- BitsPerPixel Palette Colours String
- 4 Fixed 16 c16
- 8 Fixed 256 c256
- 8 Definable 256 c256p
- 16 Fixed 32 thousand c32K
- 32 Fixed 16 million c16M
-
- eg x640y480c16M for a 640x480 display in 16 million colours
-
- Then you must allocate enough RAM for this mode. To find out how much memory
- a mode uses change to it on the desktop and use the Task Manager to display
- the 'Screen Memory' value. Note that we recommend allocating an extra 25-50%
- if you can spare the RAM as this will improve performance. This memory is
- used for blitting when Windows puts up a dialogue box or menu. If there is
- enough memory to keep the whole of the display area under the box/menu then
- update will be much quicker than if it has to go back into PC card memory.
-
- Note that values below 256K are not valid, as at least this much must always
- be allocated. Also note that the 'UseWindowFE' config option ('Allow desktop
- operation' in !PCConfig) must be on, otherwise the windows driver cannot
- claim this first 256K video area and thus cannot operate. You will get a
- 'Windows driver needs at least nnnK' error if UseWindowsFE is turned OFF, no
- matter what value is given for 'VideoRAM'.
-
- Some example modes:
- Modes Colours Memory needed Memory recommended
- 12 16 80K 105K (256K)
- 15 256 160K 210K (256K)
- 27 16 150K 200K (256K)
- 28 256 300K 400K
- 31 16 235K 300K
- 39 16 154K 200K
- 40 256 308K 400K
-
- These options appear like this in the !PC.Config text file:
-
- WinDrvMode <mode string>
-
- VideoRAM nn
-