                    GDS755X WIN95 Driver 1.30 Release
		   -----------------------------------

OEM/End user's Notes: 

-The Win95 graphic driver now takes two 1.44M diskettes to install, because it
 now includes another executable, "DirectX 3".  Please download both diskettes
 and then see the section, "How to Install 755X Win95 Driver". (below).


Changes from 1.20 to 1.30 Release
=================================

Files modified:

755X.INF, README.1ST, CIRLMM.DRV, CLMMDD32.DLL, CIRL.VXD, CLREFRSH.DLL,
CLBIOS16.DLL, CLBIOS32.DLL

Problems solved/New features:

-CLBIOS16.DLL and CLBIOS32.DLL changed version string for 
 WHQL (Windows Hardware Quality Lab).

-CIRLMM.DRV v1.26 fixed the extra dot around sw mouse cursor 
 when changing color depth while panning/scrolling is enabled.
 PDR#9091

-" fixed screen corruption after switching to external TV. 
 PDR#9167.

-CLMMDD32.DLL v1.46 fixed noise and misalignment when occluding 
 the video window. PDR#9148,9103

-CIRLMM.DRV v1.25 added 1280x1024-16bpp mode to the DirectDraw table. 
 PDR#8931

-" fixed corruption which occured while testing WHQL Disptest. PDR#8918

-" fixed garbage appearing while running foxbear in 400x300x16bpp
 mode with the XGA DSTN panel. PDR#8971.

-" caused driver to read the registry to correctly set the display to
 one of CRT, NTSC, or PAL.

-CLMMDD32.DLL v1.45 and v1.44 fixed noise while occluding video
 window in 1024x768 mode. PDR#8927

-" fixed WHQL Tddraw problem when expansion is enabled. PDR#8979

-CIRL.VXD v1.55 fixed incorrect refresh rate updates after switching
 back from a DOS full screen in the interlace modes. PDR#8749

-" fixed problem when setting 87Hz in the 1024x768x16M mode. PDR#8885

-" fixed corruption on DOS full screen while switching between currently
 open applications. PDR#9060

-CLREFRSH.DLL v1.00.0007 fixed problems while toggling between 
 CRT, Pan, or Simulscan to TV display mode. PDR#8845


Changes from 1.20 Beta 1 to 1.20 Release
========================================

Files modified:

755X.INF, README.1ST, CIRLMM.DRV, CLMMDD32.DLL, CLREFRSH.DLL,
CIRL.VXD. CLGAMMA.EXE

Problems solved/New features:

-CIRLMM.DRV v1.24 fixed noise when playback an avi file in 
 full screen with panning/scrolling enabled. PDR#8874

-" fixed noise when running Foxbear or Flipcube in Simulscan
 with XGA DSTN panel. PDR#8901,8907

-" fixed problem with WHQL TDDRAW test in Simulscan with XGA
 DSTN panel. PDR#8909

-CIRL.VXD v1.54 fixed incorrect refresh rate after switching
 back from dos full screen in 16M color modes. PDR#8749

-CLGAMMA.EXE v1.00.0004 changed string version for WHQL 
 compliant.

-CLREFRESH.DLL v1.00.0005 changed string version for WHQL 
 compliant.

-" fixed characters been cut off at Monitor refresh tab in
 German Window 95. PDR#8515

-" fixed Hot-key problem at Monitor refresh tab in German
 Window 95. PDR#8516

-CIRLMM.DRV v1.23 added new fix for character corruption after
 "Restart computer in MS-DOS mode?" with 16M color. PDR#8438

-" resolved no direct draw support problem introduced in v1.22.

-CIRLMM.DRV v1.22 added new fix for panel display problem when DPMS
 (suspend) is active. PDR#8716

-" fixed double cursor when playback an avi file with Avtivemovie or
 VFW with panning/scrolling on.

-CIRLMM.DRV v1.21 fixed garbage spilled out when playback a 5:6:5
 format video with panning/scrolling on. PDR#8816

-" fixed a garbage line at bottom of video window during playback
 with panning/scrolling on. PDR#8838

-" fixed display switching in 64K and 16M color modes. PDR#8811

-CLMMDD32.DLL v1.42 added DX5/VPE support.

-CIRL.VXD v1.53 and v1.52 fixed incorrect refresh rate after switching
 back from dos full screen. PDR#8749

-CIRLMM.DRV v1.20 fixed circle drawing in MS-WORD. PDR#8615

-" fixed GPF error message when open a new folder in Quicken. PDR#8862

-" fixed losing received characters with Hyper Terminal. PDR#8732

-" fixed corrupted and frozen display when dragging window 
 after setting Hardware Acceleration to none. PDR#8747

-" fixed small corruption in View Menu after selecting View/Outline or 
 View/Page Layout with MS-Word. PDR#8616

-" added new 4MB modes.

-CLMMDD32.DLL v1.41 use new bandwidth equation.

-" read correct VCLK when panel is on. PDR#8709

-CLREFRSH.DLL v1.00.04 added new 4MB modes supoort.

-CLMMDD32.DLL v1.40S fixed blue band appeared at the bottom during the 
 playing of "Immortal Klown". PDR#8490


Changes from 1.20 Alpha 1 to Beta 1
===================================

Files modified:

755X.INF, README.1ST, CIRLMM.DRV, CIRL.VXD, CLMMDD32.DLL, CLGAMMA.EXE,
CLGAMMA.HLP, CLGAMMA.TXT.

Problems solved/New features:

-The driver is backward compatible with 7555.

-CIRLMM.DRV v1.19 fixed noise when running Flipcube in 400x300x16 mode.
 PDR#8347

-CLMMDD32.DLL v 1.14 fixed missing characters when running Flipcube in
 640x400x24 mode with Exp on. PDR#8252.

-CLGAMMA.EXE v1.0.04 can now remove itself when it detects non-Cirrus 
 products.

- " added localization support.

-In 755X.INF file, removed ";" for the following two lines:
		:
		:
   HKR,DEFAULT,RefreshRate,,-1
   HKR,DEFAULT,DDC,,1
   		:
		:


Changes from 1.10 to 1.20 Alpha 1
=================================
File added:

CLREFRSH.DLL, CLREFRSH.HLP, CLREFRSH.TXT.

File removed:

CL_REF.DLL, CL_REF.HLP.

Files renamed:

7555.INF to 755X.INF, 7555VPM.DLL to 755XVPM.DLL.

Files modified:

755X.INF, README.1ST, CIRLMM.DRV, CIRL.VXD, CLMMDD32.DLL, 755XVPM.DLL.


Problems solved/New features:

-CIRLMM.DRV v1.17 added 7556 chip ID.

-" blocked display switching in lower resolution modes. PDR#8119

-" fixed video gamma correction with panning/scrolling. PDR#8037

-CIRL.VXD v1.48 added 7556 chip ID.

-CLMMDD32.DLL v1.12 added 7556 chip ID.

-" added support for Active movie AVI playback. 

-CIRLMM.DRV v1.18 disabled color key for XGA panel at 16bpp modes.
 PDR#8283

-" fixed an error in VC 4.0 Project Workplace. PDR#8079

-CLMMDD32.DLL v1.13 used a new version number string.

-CLREFRSH.DLL v1.00.02 added 7556 chip ID.

-755XVPM.DLL v1.10.004 added 7556 chip ID.

-" updated bandwidth equations and vertical interpolation VCLK limits.

-" added calculation and programming of CR5D.

-" added GD7555 hack to cover problems above 2.1x horizontal zoom
 which forces a 1/2 downscale.


Changes from 1.10 Beta to 1.10
==============================

Files modified:

7555.INF, README.1ST, 7555VPM.DLL

Files added:

CLGAMMA.EXE, CLGAMMA.HLP, CLGAMMA.TXT

Problems solved/New features:

-Comment out "vpm=7548vpm.dll" in 7555.inf.

-CIRLMM.DRV v1.14 fixed panel display shifted to left when running
 Flipcube in 400x300x8 mode. PDR#7595
 
- " fixed windows display shrank after running Boxbear. PDR#5526

- " enable MVA in 1024x768x256 at 3.3V while vert. refresh rate is 60Hz.
 PDR#7881

- " added new escape function 9001 & 9010 and others to support Gamma 
 utility. 

- " modified CRTC timings from 400x300x8bpp game mode.

- " Updated version and modify  copyright year to 1996.

-CIRL.VXD v1.43 fixed version was not updated. PDR#7846

-CLMMDD32.DLL v1.11 fixed MVA is not enabled in 1024x768x8bpp. PDR#7881.

-7555VPM v1.00.002 added support for GAMMA utility.

- " adjusted bandwidth equation and misc.

-CL_REF.DLL v1.11.26 fixed support for 72Hz vertical refresh while BIOS has 
 already removed 72Hz modes. PDR#5396

-Take out TV-Font support in 7555.INF.

-7555VPM.DLL v1.10.003 update bandwidth equations.

- " disable vertical interpolation for VCLK > 50MHz.

-Modified 7555.INF to install CLGAMMA.* into Windows directory.

-CIRL.VXD v1.47 fixed Optima/Adaptor Default features in the refresh
 utility does not work with the driver. PDR#8026

-CIRLMM.DRV v1.16 fixed CLGAMMA utility does not support 16bpp modes.
 PDR#7999

- " fixed new color set by CLGAMMA was revert back to default after changing
 from 64K to 256 colors in Display property. PDR#8001

-Can't switch to SimulSCAN from LCD or from LCD to CRT in 1024x768 mode.
 PDR#7402


Changes from 1.00 Beta 2 to 1.10 Beta
==========================================

Files modified:

CIRLMM.DRV, 7555.INF, CLMMDD32.DLL, CIRL.VXD

Files renamed:

7555.DRV to CIRLMM.DRV, 7555.VXD to CIRL.VXD.

Problems solved/New features:

-clmmdd32.dll v1.10 ports 7548 fix.

-CIRLMM.DRV v1.13 Disable H/W icon and cursor when update RAMDAC.

- " fixed pdr#5431.

- " Skip switch display when SR14[2]=1.

- " Update OSR2 related modules plus fixes for 7548.

- " Merge desktop optimization code to improve WinMark.

- " add desktop code to support live video application and VPM.

- " removed 5440 related direct draw code.

- " A GPF error occurs when playing the Reader Rabbit application. 
  PDR#5431

- " In Windows 95, when running an .avi file, mva is turned off. 
 PDR#5428

- " Static is Displayed While Running the Video tests of Winbench 96 
 at 1024x768x256 colors w/ a Refresh Rate of 75Hz. PDR#4933	

-" A Single Horizontal Line Flashes Across the Screen When Moving the 
  Video Window During Video Playback. PDR#5043	


Changes from 1.00 Beta 1 to 1.00 Beta 2		    
==========================================

Files modified:

7555.VxD, 7555.INF, CLMMDD32.DLL

Problems solved/New features:

-CLMMDD32.DLL v1.07 Add 24bit bltting support in blt32 procedure.

-" add new 400x300 low res. mode.

-CLMMDD32.DLL v1.09 fixed 1024x768x16bpp Compcore Mpeg player 
 hanging problem.

Changes from 1.00 Alpha 3/4 to 1.00 Beta 1
==========================================

Files modified:

7555.DRV, 7555.VxD, 7555.INF, CLMMDD32.DLL

Problems solved/New features:

PDR#				Description
====				===========

5057	Wall paper or GPF when switch to PM session from dos full screen
	in 1024x768x64k

5397	Desktop corruption occurs when viewing a database summary in MS
	Access

5412	WHQL DCT 95 DTA MISC Tests cause system hang

5413	Winsleuth gold plus video benchmark test show garbage

5218	Enable mouse trail cause GPF when switch back to PM session from
	dos full screen	in simulscan

5015	Corruption occurs when running Foxbear in SimulSCAN

5020	Mouse  fail to go up and left in 3D pinball full screen

5026	Winbench 96 (graphics winmark 96 ) halt system in simulscan

5031	Alt-Enter cause GPF after back to PM session in dos full screen
	while switch from CRT to SimulSCAN

5390	Winstone 32 show garbage when running the test

5185	Some of WIN95 monitor refresh rate funcitons does not working

5247	Mode 7 causes a blank display after toggling back from full
	screen DOS

2547	Flashing lines inside video windows in simulscan

5008	Expansion will be turn off automatically when load video for
	windows

5021	MVA will be  turn off when downscale the video frame with
	mediamatics player

5219	Garbage in foxbear with simulscan

5183	Video is not seen when the TV-Tap window first comes up

5184	Res-on-the-fly change stops video playback

5054	Fail to switch to panel or simulscan with panel 3 in 800x600x16M

5098	Portions of the video data is lost after resizing the video
	window

5099	Frames are skipped after resizing the video window

5334	Resizing display is slow when switching back to PM from dos	
	full screen in Simulscan



Changes from 1.00a2 to 1.00a3
=============================

Files Added:

7555vpm.dll, Vpm16t.dll, Vpm32t.dll, Vvpmd.vxd, Vpm32ap.exe

Files modified: 

README.1ST, 7555.drv, 7555.VxD, 7555.inf, Cl_ref.dll, Cl_ref.hlp,
Clbios16.dll, Clbios32.dll, Mciavi.drv

Files removed:

Clmmdd16.dll

Problem solved/New features:

-Flashing horizontal lines is displayed when running the video test
 portion of Winbench 96. PDR#s 4933 & 4976

-System hangs during the Paintbrush test of Wintach in 800x600 
 16 million colors. PDR#4976

-System hangs during the Lotus test of Winstone 32 when using an
 XGA, 1024x768 panel. PDR#4983

-Mouse cursor fails to move to the bottom of the display after expand
 is enabled. PDR#4953

-GPF occurs when playing an AVI file then opening a windowed-DOS
 session. PDR#4966

-Only half of the video is displayed when performing an MPEG video
 playback using Compcore. PDR#4972

-Video data is left pasted on the screen after moving the video
 window. PDR#4973

-Winbench 96 Video Tests shows flashing horizontal lines. PDR#4970

-Mouse cursor will fail to move down to the bottom of the display
 after expansion is enabled.  PDR#4953

-fixes display switching problem using the display switching
 utility. PDR# 4301

-fixes display switching problem with a full screen DOS prompt.

-fixes no support issue for 800x600 256 colors in Displaymate.

-took out 'Alpha' signs from within the CLbios thunk files.

QA Notes
========

-HW MPEG and VPM have only been tested with the Margi MPEG board for use in a 
 Desktop environment.


Resolutions & Colors supported
===============================

640x480   256 colors    (CRT/Panel/SimulSCAN and all panels)
800x600   256 colors    (CRT/Panel/SimulSCAN and all panels)
1024x768  256 colors    (CRT/Panel/SimulSCAN and all panels)
1280x1024 256 colors    (CRT/Panel/SimulSCAN and all panels)
640x480   64K colors    (CRT/Panel/SimulSCAN and all panels)
800x600   64K colors    (CRT/Panel/SimulSCAN and all panels)
1024x768  64K colors    (CRT/Panel/SimulSCAN and all panels)
1280x1024 64K colors    (CRT/Panel/SimulSCAN & all panels and 4M video memory)
640x480  16Mil colors   (CRT/Panel/SimulSCAN and all panels except XGA DSTN)
800x600  16Mil colors	(CRT/Panel/SimulSCAN and all panels except XGA DSTN)
1024x768 16Mil colors   (CRT/Panel/SimulSCAN & all panels except XGA DSTN 
                         plus 4M video memory)

How to Install 755X Win95 Driver
================================

1.  Click on the Start box in the lower left corner and proceed to Settings,
    Control Panel.
2.  Inside the Control Panel group, click on the Display icon to open the
    Display Properties folder and select the Settings tab (right most tab).
3.  Choose the "Change Display Type..." button and click the "Change..." 
    button in the Adapter Type group.
4.  Select the "Have Disk..." button and then insert the 755X WIN95 Driver 
    Installation diskette into the floppy drive A: or B: and proceed with 
    OK button.
5.  "Cirrus Logic 755X xxxx" will be highlighted as the driver of choice.
6.  Press OK and files will be copied from the diskette to your hard disk.
7.  If a "Version Conflict" dialog box pops up and asks "Do you want to keep
    this file?", answer "No".
8.  Insert second diskette into A: or B: when asking for "CL-GD755X Windows 95
    Driver Disk 2" and press OK.
9.  Press Close again to exit Display Properties folder.
10. Select Yes to restart computer before the new driver will take effect.


How to change colordepth
========================

1. Make sure you have installed the Cirrus Logic 755X Win 95' driver (see
   How to Install 755X Win95 Driver section above).
2. Click on the Start box in the lower left corner and proceed to Settings,
   Control Panel.
3. Inside the Control Panel group, click on the Display icon to open the
   Display Properties folder and select the Settings tab.
4. Click on the pull-down arrow from the Color palette area to select color
   depth.
5. Proceed with screen instruction to allow new setting to take effect.


How to change resolution
========================

1. Make sure you have installed the Cirrus Logic 755X Win 95' driver (see
   How to Install 755X Win95 Driver section above).
2. Click on the Start box in the lower left corner and proceed to Settings,
   Control Panel.
3. Inside the Control Panel group, click on the Display icon to open the
   Display Properties folder and select the Settings tab.
4. Ajust the sliding bar towards either Less or More in the Desktop area.
5. Choose OK and new resolution will take effect.


How to change monitor refresh rate and display type
===================================================

1. Make sure you have installed the Cirrus Logic 755X Win 95' driver (see
   How to Install 755X Win95 Driver section above).
2. Click on the Start box in the lower left corner and proceed to Settings,
   Control Panel.
3. Inside the Control Panel group, click on the Display icon to open the
   Display Properties folder and select the Monitor Refresh tab.
4. You can change to different refresh rates for different resolution by 
   sliding the control bars.


How to adjust surrounding graphic and video picture display quality
===================================================================

1. Make sure you have installed the Cirrus Logic 755X Win 95' driver (see
   How to Install 755X Win95 Driver section above).
2. When you install the Cirrus Logic Win 95' driver for the first time,
   a Color Correction control box comes on top of all other Windows and you 
   can control the picture display by ajusting various sliding bars.
3. If you have installed the Cirrus Logic Win 95' driver in the past, the
   Color Correction control box can be invoked from the small icon in Win 95' 
   Start menu bar or you can run CLGAMMA from the Windows directory.
4. When the Graphic button is enabled, adjusting various color controls
   would only affect Windows Desktop's picture but not video playback picture 
   (eg. VFW, MPEG playback, etc.).
5. When the Video button is enabled, adjusting various color controls only
   affect video playback but not Windows Desktop picture.
6. Set the Default button to return to factory pre-set level.


Known Problems
==============

-The screen becomes black when changing the refresh rate to 87Hz at 1024x768
 resolutions in Simulscan mode. PDR#9261,9254

-Video blanks out after display switch during Active Movie playback.
 PDR#9275

-Noise appears when moving the Active Movie window beyond the left side of 
 the screen in 1024x768-64K 70Hz and 75Hz. PDR#9220

-Garbage appears when upscaling video window with panning/scrolling enabled.
 PDR#8866

-A small garbage line appears at the top of the screen when playing back an 
 avi file in full screen mode with panning/scrolling enabled. PDR#9184

-Switching from TV to SimulScan does not function correctly. PDR#9166

-Noise appears when moving Video window during hardware MPEG playback with 
 Margi MPEG. PDR#8427

-Playing Video for Windows after running hardware MPEG with Margi card results
 in screen corruption.  PDR#8428,8877

-Video image is left on the screen while running hardware MPEG with Margi card
 and panning/scrolling enabled. PDR#8871

-Garbage appears when changing resolution on the fly with TVTAP software open.
 PDR#9056

-Flashing lines appear when moving TVTAP video window in 64K Simulscan modes
 with XGA panels. PDR#9097

-An error occurs when opening TVTAP software in 64K Simulscan modes with XGA
 DSTN panel. PDR#9098

-In Windows 95, lines appear across the video window when it is moved 
 around the screen. PDR#5096


Driver limitations
===================

-If you put something on top of the HW video MPEG playback, the playback
 image underneath would be transparent.  This is not a problem. 

-A black horizontal line flashes across the screen when either the LCD or 
 LCD/CRT option is selected in the Monitor Refresh utility. PDR#5426

-Color Correction that controls the video playback will not work when MVA is
 disabled (eg. Video playback in 640x480 resolution in Windows desktop with
 800x600 panel because the BIOS default with these modes is expansion-on to 
 cover the entire panel screen.  As per spec., when expansion is on, MVA is 
 disabled).

-Color Corrections for video have no effect in 1024x768 modes with the 85Hz 
 vertical refresh rate because it cannot enable MVA.

-If you are playing video clips, and you want to change the resolution or 
 color depth, it is recommended that you stop the playback first, otherwise, 
 you will see unpredictable results.

-When switching to TV mode with an AITech external TV implementation and the 
 TV screen does not display all of the image, you should contact AITech 
 International, Inc. for their utility to correct this problem. (7555)


Diskette Contents
=================

README   1ST    ; Release, Install and util. usage info    
755X     INF    ; Install script    
CIRLMM   DRV    ; 1.26
CIRL     VXD    ; 1.57
CLREFRSH DLL    ; 1.00.0007
CLREFRSH HLP    ;   "
CLREFRSH TXT    ;   "
CLBIOS16 DLL    ; 1.00.0000
CLBIOS32 DLL    ; 1.00.0000
CLMMDD32 DLL	; 1.46
755XVPM	 DLL	; 1.10.5 
VVPMD	 VXD	; 1.10.9    
VPM16T	 DLL	; 1.10.10    
VPM32T	 DLL	; 1.10.11    
VPM32AP	 EXE	; 1.10.3
PNP16VPM DLL    ; 1.10.1
PNP32VPM DLL    ; 1.10.1    
CLGAMMA  EXE	; 1.00.0004
CLGAMMA  HLP	;   "
CLGAMMA  TXT	;   "

