68kMLA Classic Interface
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| MegaScreen 2/Proxima Display for Plus | |
| Posted by: LaPorta on 2021-08-07 18:19:59 Hey Compact experts, I have had a MegaScreen II in my possession for probably 20 or so years, having never used it. I am not 100% sure where it is that I originally got it (my high school or inside a US Air Force Plus, one of the two), but I have never used it and don't have the faintest idea what software/what other cables I might need to make it functional. Any help would be appreciated to see if I can get the thing working.    Next up, the Proxima Display. This thing I have nothing for at all: no power supply, no video cable. It could possibly be used in conjunction with the MegaScreen, but I am not sure. Not a clue what to do with this at all, just not sure if anyone has any suggestions on where to start with it.    | |
| Posted by: LaPorta on 2021-08-09 12:51:11 Any suggestions? | |
| Posted by: bdurbrow on 2021-08-09 15:51:29 I’m mostly guessing based on how I would do that at that time in history… I suspect that it doesn’t require any software. Just attach the Killy clip to the 68000, hook the board up, and route the display cable out the case (thru the security lock hole perhaps?). I suspect that the board intercepts writes to the frame buffer address range (which is fixed on a 128k, 512k or ke, and plus) and generates a MDA, Hercules, CGA, or EGA compatible signal on that 9-pin d-sub connector. Obviously, watch out that you have the Killy clip & header the right-way-around, lest something important release the magic blue smoke… I’d check with a multimeter to make sure that the ground pin on the 68000 and the ground pins on the video board have continuity before applying power; same with the +5v pins. | |
| Posted by: LaPorta on 2021-08-09 16:47:38 There were other threads that mentioned software here previously. Also, there is another port as can be seen in the photos, not sure if I am missing another cable. | |
| Posted by: bdurbrow on 2021-08-09 19:57:44 You might have already seen this, but google spat this back at me... myoldmac.net - Apple Macintosh Display Video Cards for Sale - Buy itHere you will find those rare and vintage Apple Macintosh Video Display Monitor Cards you have been looking for. /> <meta http-equiv=
myoldmac.net
Perhaps if you dropped him a line, he might send you a copy of the software for the MegaScreen cards he has listed - if you're lucky, perhaps they used a unified driver for all their cards? Mostly just curious; what is the chip part number under the green sticker (U8 it looks like?) | |
| Posted by: olivercampion on 2026-08-23 11:24:39 I’ve got one of these. No screen but the Macintosh Plus boots so I’ve no reason to think it’s not working. The other port you mention is indeed connected to some bodge wires that go directly to a few pins on other ICs on the board. As for software, this GitHub repository seems to have a download that it claims works on all versions. Here’s my one in place on the Macintosh Plus logic board.  | |
| Posted by: bibilit on 2026-08-23 12:50:57 Concerning the Proxima display, I think you need the cable, one was supplied for the Plus and another for the SE… and a power supply. IIRC, this was used with an OHP (overhead projector) so probably useless today and the video quality should be poor | |
| Posted by: LaPorta on 2026-08-24 08:17:27 I have one of these in storage. Never was able to try it. | |
| Posted by: chianti_s_yogurt on 2026-10-01 12:16:23 Mine works well on my Macintosh SE and the monitor come with it | |
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