Macintosh IIsi Hidden video resolution.

[uniserver]

if you don't mind all blue screen, no matter what you choose, its all blue.

you can get 640x870 with the onboard graphics with this combination on your Mac to vga adaptor.

[attachment=1]Screen Shot 2014-01-11 at 6.44.16 PM.png[/attachment]

[attachment=0]Screen Shot 2014-01-11 at 6.45.47 PM.png[/attachment]

 

[Trash80toHP_Mini]

Or just use a Portrait Cable . . .

Graphics: built-in 8-bit video, supports 512 x 384 and 640 x 480 at 8-bits or portrait monitor (640 x 870) at 4-bits (uses 64-320 KB of RAM for video, not separate VRAM)

. . . and hook it up to the Portrait and it won't look all scrunched up. Since it's onboard video, you can run MacPortrait and orient the image in any direction you wish. Any MultiSync should run at 640x870. I run a 21" Graphics Level CRT in Portrait mode at 1024 x 768 that way . . .

. . . it didn't come with the tilt & swivel base. [}] ]'>

p.s. Change the Monitors Control Panel settings to grayscale and it should look a lot better, but still scrunched up.

 

[uniserver]

p.s no effect.

 

[uniserver]

i was going by everymac:

Display Support: Single Display* Resolution Support: 640x480*Details: *Onboard video is capable of supporting a maximum resolution of 640x480. If the optional NuBus adapter card is installed, a second video card can be installed to support a second display. The NuBus adapter also provides a 68882 FPU.

but i guess there is more tidbits at LEM:

http://lowendmac.com/1990/mac-iisi/

my current Mac to VGA adaptor is configured for 640x870, but its in only blue:

so if lem says this:

640 x 870) at 4-bits

then i guess its nativly capable, (maybe)

not sure why every mac doesn't mention it… and as to why i tried like every switch config and this(all blue in first post) and 640x480 (normal looking) 256 colors is all i can seem to get outta it.

maybe everymac didn't mention it because it doesn't actually work due to screwd up looking color as in what i have here.

 

[Trash80toHP_Mini]

Neither everyman nor LEM are necessarily correct on any given spec, neither has all the specs and sometimes they're both wrong or have failed to include some info. Use 'em both and you'll get it close enough to right most of the time.

Portrait Res is Rock Solid on the IIsi, it's grayscale, 2bit deep and a Macintosh fixed res standard that's apparently not supported (correctly) by the monitor you're using. It's pretty much the only USABLE res the IIsi produces as far as I'm concerned.

If you want the real deal, google the DevNotes:

On-board videoIn addition to the existing NuBus video options, a new video

solution has been built into the Macintosh IIsi computer, supporting

the Macintosh II 12-inch B&W, 12-inch and

13-inch RGB monitors and the 15-inch B&W portrait monitor. The

12-inch and 13-inch monitors are supported at up to 8 bits per pixel

(256 colors or shades of gray) and the

15-inch portrait monitor is supported at up to 4 bits per pixel (16

grays).

 

[uniserver]

well i know my monitor supports it because the RPII sends that out and it displays on it just fine. with the same settings of the Mac to vga adaptor too!

oh well… stuck with blue. the funny thing is with the nubus card in, I have all they way up to 16 color/grey options in monitor… changing it to 16 color does mess with the pixels some.. seems to get a little better definition… and does some shading, but still all blue.

 

[Trash80toHP_Mini]

Are you using the IIsi with the upgraded MoBo RAM for this test? If so, try it on an unmodified IIsi. The extra RAM in Bank A may be messing with the Vampire Video DRAM buffering setup.

Too many variables and not enough specific information:

< or not enough coffee |) >

Which NuBus Video Card, 16bit or 24bit capable?

Is 640 x 480 @ 16bit for MoBo video on the IIsi in the Monitors Control Panel is available and works without the NuBus VidCard on board?

First (sleepy) guess is that having the NuBus Card installed gives the Monitors Control Panel the chance to poll the extra 7MB of RAM on the MoBo as a great big byte that the Vampire Video subsystem is incapable of chewing. Hence, the choking on the part of the MoBo's Video Buffering attempts at ingesting and excreting pixels at various settings.

If it's not working at 640x480, try 16bit at 12" RGB resolution, maybe MoBo Vampire Video won't choke trying to chew less pixels?

Dunno, strange stuff, it probably requires taking the trouble to do methodical troubleshooting to figure it out.

p.s. as regards the

 

[uniserver]

nope for this, i'm not.

bone stock IIsi, no nubus card.

but i did try the 4meg IIsi + Nubus card, and same result.

- can't get this blue resolution to work in grey scale or anything else other then blue at this resolution.

other wise 640x480 works fine.

have all they way up to 16 color/grey options in monitor…

this particular tidbit though might have been with the Nubus + 4meg onboard one.

 

[Trash80toHP_Mini]

Yep, check to see if you have the 16bit options for the higher res w/o the NuBus card installed.

If it's a 16bit NuBus card try a 24bit VidCard and see if you get the chance try breaking the Vampire Video's RAMDAC at 24bit 640x480 and 12" RGB. [}] ]'>

 

[uniserver]

@640x870 (blue / white)

Mac to vga adaptor 6 dip

1 off

2 on

3 off

4 off

5 on

6 off

one meg ram onboard, w/o nubus adaptor 16 colors/greys

one meg ram onboard, w nubus adaptor 16 colors/greys

Four megs ram onboard , w/o nubus adaptor 16 colors/greys

four megs ram onboard , w nubus adaptor 16 colors/greys