1/17/2017 new driver models for direct download:1166
Viewsonic Pt770 5 stars review"The best driver WIKI ever! I wil keep coming back for sure."Eric Smalter, Boston, MA
Supported languages for Viewsonic Pt770
Certifications for Viewsonic Pt770
5 stars for Viewsonic Pt770 "WOW! Finally my PC got up to speed!" Melany Kim 7/18/2015

Checking...for 1/17/2017 Updates

All drivers on are updated on daily basis.

However, a new version of Viewsonic Pt770 might have been uploaded since our last site update.

Viewsonic Pt770 Driver Download

Windows Compatibility for Viewsonic Pt770 driver

Viewsonic Pt770 Driver Details:

Viewsonic Pt770 File Name:

Viewsonic Pt770 Driver Version: 571/66L

Viewsonic Pt770 ZIP Size: 121.kb

Manufacturer: Viewsonic

Viewsonic Pt770 was fully scanned at: 1/15/2017
Scan Status: driver download scanOK

Viewsonic Pt770 special revision for: Windows XP Starter Edition 32 bit, Windows 7 Enterprise (Microsoft Windows NT) 32 bit, Windows XP Home Edition N 32 bit, Windows XP Media Center Edition 64 bit, Windows 7 Ultimate 64 bit, Windows XP Tablet PC Edition 32 bit, Windows 7 Starter 32 bit, Windows XP Professional x64 Edition 32 bit, Windows 7 Service Pack 1 (Microsoft Windows NT) 64 bit, Windows XP Professional 64 bit, Windows Vista Ultimate 32 bit, Windows Vista Home Basic 32 bit, Windows 7 Home Basic 64 bit

Viewsonic Pt770 Download Stats:

Driver Uploaded: 1/2/2017

Direct Downloads: 1719
Most Recent Download: 1/16/2017
Managed Downloads: 3084
Most Recent Download: 1/15/2017
Download Mirrors: 4
Current Delay: 30 Seconds
Driver License: GNU

Direct Download Success Stats:

Reports Issued By 1538/1719 Users

Success Reported By 276/1538 Users

Driver Download Score62/100

Driver Installation Score68/100

Overall preformance Score75/100

Viewsonic Pt770 60 Thumbs Up60Thumbs
Viewsonic Pt770 17 Thumbs Down17Thumbs
Viewsonic Pt770 driver direct download was reported as adequate by a large percentage of our reporters, so it should be good to download and install.

Installation Manager Success Stats:

Reports Issued By 2736/3084 Users

Success Reported By 2240/2736 Users

Driver Download Score88/100

Driver Installation Score79/100

Overall preformance Score86/100

Viewsonic Pt770 2189 Thumbs Up2189Thumbs
Viewsonic Pt770 131 Thumbs Down131Thumbs
Viewsonic Pt770 driver installation manager was reported as very satisfying by a large percentage of our reporters, so it is recommended to download and install.


1. Direct Download

Select your OS and press "Download".

This option requires basic OS understanding.
Select Your Operating System, download zipped files, and then proceed to
manually install them.
Recommended if Viewsonic Pt770 is the only driver on your PC you wish to update.


2. Driver Installation Manager

This option requires no OS understanding.
Automatically scans your PC for the specific required version of Viewsonic Pt770 + all other outdated drivers, and installs them all at once.

Please help us maintain a helpfull driver collection.
After downloading and installing Viewsonic Pt770, or the driver installation manager, take a few minutes to send us a report:
* Only registered users can upload a report.

Don’t have a password?
Please register, and get one.

Viewsonic Pt770 may sometimes be at fault for other drivers ceasing to function

These are the driver scans of 2 of our recent wiki members*

*Scans were performed on computers suffering from Viewsonic Pt770 disfunctions.

Scan performed on 1/17/2017, Computer: Lenovo ThinkPad Edge E431

Outdated or Corrupted drivers:13/25

Device/DriverStatusStatus DescriptionUpdated By Scanner
Microsoft Controlador BIOS de Microsoft System ManagementOutdated
Mice And Touchpads
Microsoft Microsoft PS/2 MouseUp To Date and Functioning
Wacom HID-compliant mouseCorrupted By Viewsonic Pt770
Microsoft Microsoft USB IntelliMouse Explorer 3.0Corrupted By Viewsonic Pt770
Usb Devices
Microsoft Otwarty kontroler hosta PCI do USB SiS 7001Outdated
Logitech Cisco VT CameraOutdated
HTC Android PhoneOutdated
Sound Cards And Media Devices
Pinnacle Pinnacle PCTV 310i Capture DeviceCorrupted By Viewsonic Pt770
Motorola Motorola SM56 Speakerphone ModemCorrupted By Viewsonic Pt770
C-Media Multimedia Audio ControllerUp To Date and Functioning
Network Cards
Qualcomm Atheros Atheros AR9485WB-EG Wireless Network AdapterUp To Date and Functioning
Microsoft HID KeyboardUp To Date and Functioning
Hard Disk Controller
Intel(R) 82801BA Ultra ATA Storage Controller - 244BCorrupted By Viewsonic Pt770
National IrDA Fast Infrared PortUp To Date and Functioning
ENE ENE CB-1410/851 Cardbus ControllerUp To Date and Functioning
NEC Texas Instruments PCIxx12 Cardbus ControllerCorrupted By Viewsonic Pt770
Texas Instruments Texas Instruments PCI7420 Integrated FlashMedia ControllerCorrupted By Viewsonic Pt770
Intel(R) 82801EB Ultra ATA Storage Controllers - 24D1Up To Date and Functioning
Western Digital WD SES Device USB DeviceUp To Date and Functioning
Cameras, Webcams And Scanners
Realtek Realtek USB2.0 PC CameraUp To Date and Functioning
Video Cards
ATI RADEON X300 Series SecondaryCorrupted By Viewsonic Pt770
Input Devices
Hewlett-Packard HP Link-5 micro dongleUp To Date and Functioning
Port Devices
PROLiNK PROLiNK Diagnostics Device (COM8)Outdated
Sony Digital Flat Panel (1024x768)Up To Date and Functioning
Mobile Phones And Portable Devices
Acer NOKIAUp To Date and Functioning

Scan performed on 1/17/2017, Computer: HP VS243AA-ABD HPE-010de

Outdated or Corrupted drivers:9/19

Device/DriverStatusStatus DescriptionUpdated By Scanner
Intel(R) 631xESB/6321ESB/3100 Chipset USB Universal Host Controller - 268BUp To Date and Functioning
Mice And Touchpads
Microsoft MICROSOFT SERIAL MOUSE 2.1ACorrupted By Viewsonic Pt770
WheelMouse USB Advanced Wheel MouseUp To Date and Functioning
VMware VMware USB Pointing DeviceCorrupted By Viewsonic Pt770
Usb Devices Burr-Brown USB Audio Codec 2900 (commercial 2.8.45)Outdated
Hewlett-Packard HP LEDM DriverOutdated
Sound Cards And Media Devices
AMD AMD SATA ControllerUp To Date and Functioning
ASUSTek ASUSTeK Silicon BDA Video CaptureOutdated
Network Cards
Intel(R) Dual Band Wireless-AC 7260Up To Date and Functioning
Microsoft HID KeyboardCorrupted By Viewsonic Pt770
Hard Disk Controller
ALi Coporation ALi M5229 PCI-Bus-Master-IDE-ControllerUp To Date and Functioning
Acronis Seagate DiscWizard Image Backup Archive ExplorerUp To Date and Functioning
Microsoft HID-compliant deviceOutdated
Cameras, Webcams And Scanners
Canon Canon MP160Up To Date and Functioning
Video Cards
NVIDIA NVIDIA GeForce GT 630MUp To Date and Functioning
Input Devices
Logitech USB Human Interface DeviceUp To Date and Functioning
Port Devices
Huawei Vodafone Mobile Broadband Secondary Port Modem (Huawei) (COM28)Corrupted By Viewsonic Pt770
Sony Digital Flat Panel (1024x768)Up To Date and Functioning
Mobile Phones And Portable Devices
Acer NOKIACorrupted By Viewsonic Pt770
Driver ModelOriginal Upload DateLast ModificationDriver FileFile SizeCompatible Computer ModelsAvailabilty To Instalation Manager
Viewsonic Pt770 21.172.122/28/201512/30/2016viewsonic_pt770-21.172.12.exe89kbHP Presario V3000, IBM ThinkPad T40, IBM IBM IntelliStation M Pro -[922962J, HP PS568AA-ABA A1019H, Sony SVS13A17GBB, LG R490-KR8WK, IBM 814132U, Sony VPCEB36FG, NEC EASYNOTE PB37R00002, NEC NEC POWERMATE X8520, Sony VGC-RB41P, NEC EASYNOTE P910401306, Fujitsu FMVCE70J7, Compaq EP103AA-ABU SR1709UK GB610, IBM 8171VRJ, Panasonic CF-W7DWJQJR, and more.
Viewsonic Pt770 4231.1812/27/201412/27/2016viewsonic_pt770-4231.18.exe65kbSony PCG-Z1M, Sony VPCEB33FG, Toshiba T20, Gateway M-152S, CdcPointSpa CX-7592, Gateway DX441X, HP Compaq nx9020, HP KZ848AAR-ABA a6510t, Fujitsu FMVLX60W, HP NB939AA-ABF IQ525f, Powerspec B651, Sony VGN-TZ170C, Dell Inspiron N5040, Fujitsu FMVXNN281, HP HP ProBook 6445b, Intel LM1WN, HP NQ867AA-UUZ m9650ch, Panasonic CF-53JJCZY1M, and more.
Viewsonic Pt770 2.138483/8/201512/27/2016viewsonic_pt770-2.13848.exe82kbHP PW572AA-B1U, Toshiba Satellite L850-B750, LG R490-KR6WK, IBM 2888W5S, HP P7-1040be, HP P6-2155a, Toshiba SATELLITE U50-A, Lenovo 2008WHV, NEC PC-VY25AAZ7A, Fujitsu Stylistic LT P-600, HP EC577AA-B1U, HP WC812AA-ABV HPE-130me, and more.
Viewsonic Pt770 2.13091.110/30/201412/30/2016viewsonic_pt770-2.13091.1.exe175kbHP HP Compaq 8710p, Fujitsu N6220, NEC PC-GL22ES3GA, Sony VPCZ1290S, IBM 817231G, IBM IBM eServer 206m -[8485PEE, Gateway P-7809u, Dimotion PCDBS44H, AT OFFICEPRO SFF, LG A540-D, Compaq EP103AA-ABU SR1709UK GB610, Toshiba SATALLITE A300, HP GG692AA-ABZ, Panasonic CF-W7DWM07JM, HP K574aa-ABA a1739, Sony SVE14A2V2ES, Sony PCG-R505V_BD, and more.
Viewsonic Pt770 331.12412/1/201412/28/2016hglbghd-331.124.exe74kbAcer AX12300-U1801A, HP HP Compaq nc4010, HP HP Compaq 6730b, LG Z20NH.AR51B3E, Fujitsu CELSIUS W380, IBM 18669MG, HP PS235AA-ABF m1280.f, LG LW75-P333, Gateway PROFILE3, Intel S1200RP_SE, and more.
Viewsonic Pt770 F729332/13/201512/30/2016viewsonic_pt770-f72933.exe185kbHP GX609AAR-ABA m9160f, Compaq P8657F-ABA SR1000V NA510, Toshiba Satellite P20, Dell Inspiron M4040, Lenovo Lenovo G470, Samsung NP-R510-FS04NL, Sony VGC-RT150DY, MouseComputer H87M-S01, Lenovo ThinkPad X201, IBM 1871WNV, NEC PC-VX500BD, HP HP Pavilion dv8000, HP GU519AA-UUW, and more.
Viewsonic Pt770 62410/26/201412/30/2016viewsonic_pt770-624.exe136kbHP GX609AA-A2L m9160f, HP DF179A-ABZ a130, Gigabyte G41MT-D3PT, Fujitsu FMVNA1CC, LG GS50-5FH1, WIPRO WNBOBM4901-0022, IBM System x3200 M3 -[7328Z6S, Fujitsu FMVXNN281, Sony VPCEB19GX, Toshiba Dynabook EX1/524CMEWD, HP Pavilion ze5300, Panasonic CF-31UEUJDDA, Sony VPCCW2AFJ, and more.
Viewsonic Pt770 2073712/7/201412/27/2016viewsonic_pt770-20737.exe29kbFujitsu D2312-C1, Sony VGN-NW305F, HP S5-1021p, Gateway P-6312 HSN, NEC PC-MY26XHZE1, ASUS N56VM, Dell Inspiron N5040, IBM 2668VMY, IBM 8183TQG, Olidata IPMIP-GS H57, HP NC214AA-UUW a6730sc, HP HP 655 Not3book PC, IBM 2645CBH, Sony VGN-NS328J, Sony VGNFW590G, Sony VGN-TZ32VN_X, Gateway MD7321U, and more.
Viewsonic Pt770 1.1472.19/22/201412/29/2016viewsonic_pt770-1.1472.1.exe71kbABook Z410, Lenovo ThinkPad Edge E320, Toshiba TECRA A2, Sony VGN-NW24MG, Sony VGN-SZ2HP_B, IBM D945PLRN, HP FK861AA-AB0 a6625tw, LG X130-G.A7B1E1, KOBIAN PI845GVM, Panasonic CF-T1RCAXR, NEC VERSAE6301 RNF61119695, Fujitsu FMVNFD85D, Toshiba SATELLITE C855-1NF, KONTRON 886LCD-M/Flex, HP AZ205AAR-ABA p6300z, and more.
Viewsonic Pt770 C30631.11/4/201512/28/2016viewsonic_pt770-c30631.1.exe215kbGateway FX6800-05, SIEMENS MC PC BOX V5 CPB, Panasonic CF-74KCJDZAM, IBM 2374E80, Toshiba Satellite C660-M21U, Sony VPCZ12X9R, Panasonic CF-Y7BWTAJS, HP HP Compaq dc7600 Small Form Facto, Sony VGN-NS38M_P, IBM 8184LG1, HP HP d530 SFF, Fujitsu CELSIUS M730powe, Lenovo 6463WSS, ASUS G750JX, LG Z1-B821P1, and more.
Viewsonic Pt770 A71.1221.11/18/201512/28/2016viewsonic_pt770-a71.1221.1.exe27kbIBM IBM System x3400 M2 Server -[7837K9G, HP RR496AA-ABU, Lenovo Lenovo H320 10046, Lenovo 7373WG6, Sony VPCL22AJ, HP CQ2803ESm, IBM IBM System x3100 -[434842X, Lenovo ThinkCentre M90p, LG R580-U.APC3BA9, Sony SVS13A15GDB, Toshiba SATELLITE C855-12Z, Sony VGN-CR35T_B, and more.
Viewsonic Pt770 62041.111/27/201412/30/2016viewsonic_pt770-62041.1.exe77kbPowerspec B651, Sony VGN-TZ170C, Dell Inspiron N5040, Fujitsu FMVXNN281, HP HP ProBook 6445b, Intel LM1WN, HP NQ867AA-UUZ m9650ch, Panasonic CF-53JJCZY1M, Acer P4LJ0, HP FJ454AA-AC4 s3620b, Seneca Pro329919, IBM 23795VU, Gateway GM5632E, IBM 8187QG7, Gigabyte M1028E, IBM 2647LG7, Compaq P8657F-ABA SR1000V NA510, IBM System x3200 M3 -[7328K1G, Systemax Charity PC 2010, and more.
Viewsonic Pt770 1.1246212/3/201412/27/2016viewsonic_pt770-1.12462.exe76kbHP HP Compaq nx7400, Daewoo CT7150, SAMSUN 200B4Z/S01TH, ASUS CG5290, Advent DT2, HP DF179A-ABZ a130, ARLT Computer Produkte Mr. Gamer 7-11 R2, Panasonic CF-52JE203NW, Lenovo ThinkPad T530i, Sony VPCEA47EC, Toshiba Dynabook Qosmio D711/T3EB, HP ED713AA-ABF w5155.f, Notebook RIM2050, Toshiba Dynabook T350/36AB, Lenovo ThinkPad SL410, Fujitsu FMVXD4VR2Z, DIXONSXP GX9000, and more.
Viewsonic Pt770 7236710/10/201412/28/2016fvos-72367.exe55kbPackard Bell IMEDIA D4129 BE, Sony VGN-G11XRN_B, Acer Aspire X5900, HP S5-1445b, Lenovo 3000 J110 Desktop, Fujitsu FMVXNN481Z, LG R405-A, IBM 6204EBC, Sony VPCCW29FS, HP KB003AA-B14, HP HPE-310pt, HP 23-a030a, HP HP G5000, Toshiba SATELLITE L875-12M, HP 500-108eo, and more.
Viewsonic Pt770 221.19912/23/201412/27/2016viewsonic_pt770-221.199.exe34kbCompaq EK360AA-ABZ SR1659IT IT540, HP HP Compaq nc6000, MSI VR321, Fujitsu FMVA56CWG, Sony VGN-AW15G_H, Sony VGN-Z51MG_B, Nvidia MCP7A-ION, Sony SVT13136CWS, Lenovo ThinkPad X1 Carbon, Fujitsu FMVLRA70, HP RR455AA-ABF t3727.f, Sony SVE14A35CVPI, Packard Bell EasyNote TR83, Sony VGN-SZ420N, and more.
Viewsonic Pt770 31.12322/11/201512/29/2016viewsonic_pt770-31.1232.exe133kbSony PCG-Z1M, HP PS304AA-ABH, Toshiba Dynabook T351/57CWS, HP GS210AA-ABV dx2290MT, HP NM798AA-UUZ IQ532ch, IBM 8183TQG, Medion X781X/X782X, HP FL436AA-ABF a6631af, Samsung R517/R717, Lenovo ThinkCentre M58, Fujitsu FMVLRD50P, Sony 9906733-3100574, HP Compaq Mozart CQ50-112eo, Supermicro C7Q67, Panasonic CF-SX3TETBR, ARISTO VISION i535, Buympc TRANSPORT T2500 154 E, and more.
Viewsonic Pt770 W2.1271.199/22/201412/28/2016viewsonic_pt770-w2.1271.19.exe181kbEMachines ET1331G-07w, HP HP Compaq dc7600 Small Form Facto, Sony VPCW210AB, Sony SVF14N15CLB, Acer Acer 8935G, Epson Endeavor AT205, Sony PCG-GRZ615M, Panasonic CF-SX1GEFDP, MouseComputer H81H3-D, HP EZ090AA-ACP, MSI GP60 2PE, DIXONSXP GX9000, Alienware Aurora m9700, Toshiba Libretto U100/190DSW, Panasonic CF-W8GWEZFN2, Acer Predator G5900, ALFATRON SpA DN1020/M, and more.
Viewsonic Pt770 1.11.10622/4/201512/27/2016viewsonic_pt770-1.11.1062.exe71kbFujitsu LifeBook T4310, Sony PCG-GRZ615M, HP HP G60 Notebook PC, IBM IBM eServer m Mem-[7976KJG, DIEBOLD Sierra, HP RR523AA-UUW, Lenovo ThinkCentre M75e, Crea NW SERIES, Toshiba SATELLITE C870-12E, Lenovo 10385DG, and more.
Viewsonic Pt770 R223269/22/201412/27/2016viewsonic_pt770-r22326.exe74kbLG T1-5224A3, Fujitsu LIFEBOOK NH532, Dell PowerEdge 1800, HP CQ2803ESm, Compaq Evo N610c, ASUS X200MA, IBM 6830TBG, Fujitsu FMVA42CW2, Lenovo 20AVCTO1WW, Packard Bell ISTART D2141, and more.
Viewsonic Pt770 201.129/30/201412/30/2016viewsonic_pt770-201.12.exe22kbSony SVF15N1B4E, Toshiba Dynabook SS LX/190DK, NEC PC-VY13MEFEU, Compaq VN469AA-UUZ CQ5235CH, LG P100-S.AB09E, Shuttle SB62V10, HP KZ631AAR-ABA IQ505, HP HP 655 Not3book PC, NEC PC-VJ22ERNCHTLB, NEC PC-MY21AESED983, HP HP HDX 16 Notebook PC, Panasonic CF-19AHNAHFL, Dell Vostro 1320, HP H9-1390ef, Sony VGN-P50_G, and more.
Viewsonic Pt770 6282610/3/201412/29/2016viewsonic_pt770-62826.exe155kbByteSpeed BYTESPED, HP VG292AA-ABD p6202de, Olidata JumPC, Sony VGC-JS92JS, Toshiba SATELLITE U50-A, Panasonic CF-S8HYEPDR, Gateway MX7337H, Packard Bell OneTwo M3450, Sony Vgn-sz483, Viglen VIG430P, Lanix BRAIN 4140, Toshiba Satellite A300-1L0, and more.
Viewsonic Pt770 D1.132.132.18/30/201412/27/2016viewsonic_pt770-d1.132.132.1.exe153kbHP EC577AA-B1U, HP WC812AA-ABV HPE-130me, Sony VGN-BZ13XN, Acer AT310 F1, Fujitsu Amilo M1439 Series, Intel D2500CC, HP KQ265AA-AB4 s3385d, Sony VGN-FW17GU_H, HP KZ794AA-ABM a6630la, Lenovo 2689PHG, Sony VGN-FJ78SP_W, Toshiba Satellite A100-386, Packard Bell NC-ENLE11BZ-4508G1TMNKS, Fujitsu CELSIUS R930, HP H9-1390ef, LG RB380-A.AFLGL, Sony VPCEB19GX, Fujitsu PRIMERGY RX100 S6, HP XXX, and more.
Viewsonic Pt770 D2.11.11.1879/8/201412/27/2016viewsonic_pt770-d2.11.11.187.exe178kbHP P7-1106, Gateway MX6422, HP P6570jp, Sony VPCF11E4E, NEC EASYNOTE PB41Q00006, Acer Aspire 5710Z, HP EP086AA-ABS, Lenovo 20AUA02MMB, Sony SVE15117FJB, HP KE485AA-UUZ, HP DW167A-ABF a425.f, HP P8264A-ABF 761, Packard Bell IPOWER X9075, HP HP ProBook 6555b, and more.
Viewsonic Pt770 E237262/22/201512/28/2016viewsonic_pt770-e23726.exe42kbHP PC106A-ABA a610, Sony VGN-A290, Transource Computer Systems, Sony VGN-AW150Y, Pinnacle C5108, NEC PC-VJ10MCHE2, Sony VGN-CS325J, DEPO DEPO_VIP_M8710, LG LS50-A514ZL, Gigabyte P35-S3, Wearnes Premiere 8550Le, Anhoch Goliath XD630, Compaq Workstatio, and more.
Viewsonic Pt770 1.16873/9/201512/27/2016viewsonic_pt770-1.1687.exe107kbCompaq NC696AA-ABA SR5000, NEC PC-LL3509D, Sony VGN-TZ71B, HP KJ325AA-ABG a6440a, ALFATRON SpA DN1020/M, KOBIAN PI845GVM, NEC PC-VY26AEZ78, Lenovo 2999A32, IBM Razo, LG P1-P7200M, IBM 2668W9R, LG R500-U.CPCIT, CdcPointSpa MS-7277, Toshiba PORTEGE M750, Supermicro X9DRW-3LN4F+/X9DRW-3TF+, Lenovo ThinkCentre A58, and more.
Viewsonic Pt770 M422.14610/29/201412/28/2016viewsonic_pt770-m422.146.exe186kbIBM ThinkCentre M50, Packard Bell EASYNOTE SW85, Sony VGC-LS31N, IBM 8141KGR, HP PS306AA-AB9, HP FR378AA-ABH, Sony VGN-A197VP, HP HP Pavilion dv7 Noteblook PC, Sony VGC-LA83DB, LG X130-G.A7B6T, IBM 6229LQG, Gateway FX6800, ASUS K84L, Compal HGL30C, HP 23-b232e, Sony VGN-CS31Z_Q, IBM 6229LQG, Panasonic CF-19LCRDX6B, and more.
Viewsonic Pt770 1.126682/13/201512/28/2016-1.12668.exe74kbFujitsu FMVF77DDRC, Packard Bell EasyNote_MT85-T-001PT, NEC PC-LL750NSB-YC, NEC PC-VN770JS3EB, Acer Veriton M200-Q57, Sony VGN-CS36SJ_R, PrimeLine Professional-i7, Fujitsu FMVA58CM, Intel Edusmart P-168, IBM 813135U, IBM 1845BJ1, NEC NEC POWERMATE S2100-006, HP NC699AA-ABJ a6740jp, Lenovo 8933W91, HP 520-1000pt, AT AT-IQON, HP VN465AA-UUW HPE-010sc, and more.

Please Note: There are particular operating systems known to have problems with Viewsonic Pt770:
  • Windows XP Professional x64 Edition
  • Windows 7 Home Premium
  • Windows Vista Home Basic
If you encounter problems with the direct download for these operating systems, please consult the driver download manager for the specific Viewsonic Pt770 model.
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