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 Post subject: Monitor Definition Files for 30" Display (2560 x 1600)
PostPosted: Fri Oct 31, 2008 7:54 pm 
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Joined: Fri Sep 12, 2008 2:02 am
Posts: 16
Using a 30" monitor at 2560 x 1600 with VirtualRPC was not fun as the Display Configuration utility limits the selectable display to only 2048 x 1534.
The alternative was to write specific MDF scripts for new modes.
I have added three (3) new display modes to the default VirtualAcorn (VRPC-SE) monitor file to make use of the large 30" screen at display resolutions of 2560 x 1600.
The definitions are as follows:

Code:
#-------------- start ----------------------
# For full screen display mode outside Windows desktop
# 2560 x 1600 (51hz)
startmode
mode_name:2560x1600 FullScrn
x_res:2560
y_res:1600                      
pixel_rate:214000
h_timings:10,10,16,2560,0,0
v_timings:10,0,0,1600,0,0
sync_pol:0
endmode

# For display in the Windows desktop
# 2560 x 1600 (51hz)
startmode
mode_name:2560x1600 FullDTP
x_res:2560
y_res:1470            
pixel_rate:197000
h_timings:10,10,16,2560,0,0
v_timings:10,0,0,1470,0,0
sync_pol:0
endmode

# For display in the Windows desktop when
# the gadget bar is also displayed
# 2560 x 1600 (51hz)
startmode
mode_name:2560x1600 DTPGBar
x_res:2400
y_res:1470                      
pixel_rate:184000
h_timings:10,10,16,2400,0,0
v_timings:10,0,0,1470,0,0
sync_pol:0
endmode
#-------------- End ----------------------

The first mode is a Full Screen mode 2560 x 1600 for display outside the Windows desktop.

The 2nd mode is a display setting for use when in the Windows desktop as it adjusts the vertical display for the height of the Windows Taskbar.

The 3rd mode is a display setting for use when in the Windows desktop and adjusts for both the Windows Taskbar and Gadget Bar in Windows Vista.

The VRPC-SE monitor definition file is located in the following directory:
HostFS::HardDisc4.$.!Boot.Resources.Configure.Monitors.VirtualAcorn

it is a text file and you can add the above 3 definitions to the end of the file just before the last line reading #End.

With the above resolutions, as a default, the system will limit you to 32K colours.

Hope someone may find the above helpful.

Cheers.

Mohsen


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 Post subject: Re: Monitor Definition Files for 30" Display (2560 x 1600)
PostPosted: Sat Nov 01, 2008 7:11 pm 
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Joined: Thu Nov 29, 2007 11:42 pm
Posts: 72
For info/interest, it does seem to be possible to retain 16M colours in the first two modes by starting up VirtualRPC-SA or -AdjustSA using the ARM7500 emulation (which I believe gives a max screen memory of 16000K).

The memory used for the first 2 modes is 13784K and 14700K respectively.

If the third mode is selected, the colour depth does drop to 32K though, using 'only' 8000K screen memory.

(Presumably the memory would exceed 160000K in 16M colours?)

I haven't tested it, but there doesn't seem to be any noticeable performance hit in these mega-res modes (Intel E6600 processor - 2.40GHz.)

Geoff Peck
pp T.O.M.S.


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 Post subject: Re: Monitor Definition Files for 30" Display (2560 x 1600)
PostPosted: Sun Nov 02, 2008 2:46 pm 
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Joined: Fri Sep 12, 2008 2:02 am
Posts: 16
T.O.M.S. wrote:
For info/interest, it does seem to be possible to retain 16M colours in the first two modes by starting up VirtualRPC-SA or -AdjustSA using the ARM7500 emulation (which I believe gives a max screen memory of 16000K).

The memory used for the first 2 modes is 13784K and 14700K respectively.

If the third mode is selected, the colour depth does drop to 32K though, using 'only' 8000K screen memory.

(Presumably the memory would exceed 160000K in 16M colours?)

I haven't tested it, but there doesn't seem to be any noticeable performance hit in these mega-res modes (Intel E6600 processor - 2.40GHz.)

Geoff Peck
pp T.O.M.S.


True.

I discovered that I could get more VRAM (and therefore more colours) when selecting ARM7500 but not when selecting the StrongARM.

2560 x 1600 with 16M colours is possible with ARM7500 but not StrongARM !!!

Why is this?

Mohsen


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 Post subject: Re: Monitor Definition Files for 30" Display (2560 x 1600)
PostPosted: Sun Nov 02, 2008 6:37 pm 
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Joined: Thu Nov 29, 2007 11:42 pm
Posts: 72
With VirtualRPC-SA or -AdjustSA, you have a choice of three start-up emulations:

- Both the 'ARM710' and 'StrongARM' options have a limit of 8MB VRAM (the original release was 2MB, just like the real RiscPC). So if you select a combination of display resolution and colour depth which would exceed the current 8MB screen memory limit, normally the colour depth is dropped automatically - usually to 32K - to bring it back within limits.

- The 'ARM7500' option emulates the real A7000 where the 'VRAM' was taken from the machine's main RAM, up to a max of 16MB. So with this option selected, you can achieve a screen res of (say) 1920x1200 or 2048x1536 pixels, both in 16M colours.

The same goes for the first two 2560x1600 modes you provided. The screen memory required in 16M colours is less than 16000k, so that's OK.

But I suspect that with the slightly different settings required for the third mode, the screen memory required will exceed 16000k, so the colour depth is automatically dropped to 32K.

"StrongARM-compatible" software should still run OK with the ARM7500 emulation. If you have any software which specifically *requires* StrongARM to run (IMHO very unlikely), you'll need to select the StrongARM start-up option and limit either screen res and/or colour depth, so as not to exceed the screen memory limit of 8000k.

HTH, Doug Stephenson
pp T.O.M.S.


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