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#1 2014-10-22 02:29:12

jt
Member
From: Bermuda Triangle, NC USA
Registered: 2014-05-21
Posts: 1,408

SuperVidCard: SuperMac Spectrum 24 v.1

I've gotten tired of talking to myself in this project thread and now's the perfect time for a re-boot!

Thanks to this tangential discussion, I finally managed to find search terms that have enabled me to locate means to calculate the timings necessary to wring all kinds of resolutions out of this 25 year old VidCard!

New info:

http://ftp.cis.nctu.edu.tw/csie/Softwar … VTv1_1.pdf

I'm in touch with the VESA Moderator to clear up my login probs so I can get the companion CVT Spreadsheet.

Meanwhile: gotta find the screen-shots that wound up deep-sixed. mad





<  .  .  .  figures now he can talk to himself here.  roll  >


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#2 2014-10-22 06:29:56

jt
Member
From: Bermuda Triangle, NC USA
Registered: 2014-05-21
Posts: 1,408

Re: SuperVidCard: SuperMac Spectrum 24 v.1

OpenOffice didn't like the Excel Spreadsheet, so  .  .  .

<   .  .  .  shudders violently, but manages to hold down his cookies. GAH!!!!! yikes >

.  .  .  I finally had to break down and install that ^%*\$]^#$&^%$*> Office 2010 Starter. tongue

I'm very unhappy about doing that, but the spreadsheet loves me for it. I've got all the timings ready to be plugged into the control panel for The Spectrum 24 to tell me what oscillator I need to buy and  install in order to throw 1280x720x24bit@60Hz (720p Reduced Blanking for LCDs) at my HDTV from this 25 year old VidCard inside an equally old Macintosh IIfx!

Heh!  big_smile

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#3 2014-10-22 09:39:15

LCGuy
Administrator
From: Sydney, Australia
Registered: 2014-05-13
Posts: 821

Re: SuperVidCard: SuperMac Spectrum 24 v.1

720p from a NuBus card in a IIfx?

Three...well....one word....pixplzthx!!!!! yikes

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#4 2014-10-22 14:36:22

jt
Member
From: Bermuda Triangle, NC USA
Registered: 2014-05-21
Posts: 1,408

Re: SuperVidCard: SuperMac Spectrum 24 v.1

That's 720p @ 24bit from a NuBus Card from the year of the IIfx rollout  .  .  .

.  .  .  on my 32" HDTV  .  .  . displayed at its native resolution!

I'm just getting started, next calc will be the maximum resolution for my 22" ViewSonic P225f CRT.

Quad Extended Graphics Array 2048x1536 (from Wikipedia)

This is the highest resolution that generally can be displayed on analog computer monitors (most CRTs), and the highest resolution that most analogue video cards and other display transmission hardware (cables, switch boxes, signal boosters) are rated for (at 60 Hz refresh). 24-bit colour requires 9 MB of video memory (and transmission bandwidth) for a single frame. Also the native resolution of medium to large latest-generation (2012), standard-aspect tablet computers.

That's Quadrupled 19" resolution transformed from 1989's virtual desktops paged for tiny CRTs to a visible desktop on a CRT developed after Y2K, fifteen years later!

3MB/9MB = 256 grays for Adobe Illustrator 88 & Aldus PageMaker




< crosses fingers smile >

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#5 2014-10-24 06:38:15

jt
Member
From: Bermuda Triangle, NC USA
Registered: 2014-05-21
Posts: 1,408

Re: SuperVidCard: SuperMac Spectrum 24 v.1

The Pet IIfx is officially out of semi-retirement for this project and the rest appears to have done it some good. It's taking screen shots again! It was bombing with a CoPro error doing that the last time I was playing with it. But now it works, I'm happy. Still gotta recap it at some point. Maybe I can order those after I get together a shopping list for oscillators for the SuperCard!

I've got the weekend off and I owe myself a bit of R&R, so we'll see what reaction the 25 year-old software has to much more current timing settings. I'm especially interested in fining out how it reacts to abbreviated timing settings suitable for use on LCDs that can't work on CRTs.

Playtime!  smile

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#6 2015-11-12 22:25:39

jt
Member
From: Bermuda Triangle, NC USA
Registered: 2014-05-21
Posts: 1,408

Re: SuperVidCard: SuperMac Spectrum 24 v.1

Hey, apm, found this re-boot of my SuperMac project, so I'm almost sorry I dredged up the original thread over at the MLA. After you've given the timings the once over for your Compact Retina project, maybe you can help me translate the worksheet timing data into the inputs needed for this card's software.  IIRC that was where I was stuck. :-/

I'll shoot you the VESA Worksheet ASAP.

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