BIOS Updates forum

Ah, yes I forgot about that multiplexing business. But heres a question if 10 address lines can address 1mb why can I only put in 512kb modules? Is this because the modules are x4 and 1024kbit x 4 = 512kbyte. Now this multiplexing does bring up something in my favor, the motorolla 68010 multiplexs a...

If you have junked out motherboards (non-working) with 72pin simm sockets the easiest way (unfortunately) is to leave the modules alone put them in their own socket and wire the sockets together straight, EXCEPT for the address lines. As NickS said earlier simply putting them on the back would requi...

I always wondered that if you had a single-sided 16MB SIMM (8 chips on one side for example), if you could put 8 chips on the back side to make it a 32MB SIMM (of course using the same type and speed-rated parts...). Yes you can with a but, you have to take the two 4mb modules and wire them into on...

I have a laundry list of unanswered questions, here goes nothing. If 72pin simms have 144 physical connections, what are the ones on the back for? Ditto on 30pin? I have found the respective pinouts for both 30pin simms, 72pin simms and the DIPs I have. Anyway I was thinking of taking an 8mb 72pin s...

Thanx for the link I figured that out about the x16 quite quickly when I actually looked at them :) Hmm, anyone know of any place I can order a small number of chips and not end up spending over $100? Heck, any place that has them even :) I have been looking through the stack of 100+ simms that i ha...

Yep ditto on the speedgrades but apple_roms assumption that 256mb 16chip "low density" dimms work on the m571 isn't entirely correct. The latest m571 bios has major issues with timing on large dimms 128mb+ and usually won't post with a 256mb 16chip low density dimm. (I have tried 12 different brand ...

I am looking to upgrade an old motorolla based System I have. I know it can take KM44c1000 1m x 4 (I currently have 4mb of this installed) or M514256 256k x 4 (the old stuff that takes it to 1mb) What I am wondering is would this system take 1m x 16? or do you believe since all the other modules are...

Thanx KachiWachi, now the fun part

Cheers
Ryan

Hmm, those sites are usefull, but alas they all have info on going the wrong direction VGA->BNC I need the other way around.

Kachi I came up with pages like that before, but now how do I get it to go the other direction? (I am only an IE sorry :) If I attach composite sync on the opposite end it doesn't seem to work backwords. http://www.hut.fi/Misc/Electronics/circuits/vga2rgbs.html . Soupy Yep, thats one of the cables I...

Yes that is exactly what I am looking for. My system sends composite sync. (no idea why) But it hooks into a 9pin magnavox RGB monitor that is similar to vga in res and color depth but of coarse takes composite sync. Hmm, thats a little pricey compared to the vga converters I have seen, too bad ther...

Hi, I have a proprietary graphics system that sends out RGB graphics via a 9pin port. It can be converted to 4BNC RGB + Sync w/ a targa cable I have. I am looking for a way to separate the sync so I can hook up a standard VGA monitor as the monitors for this unit are getting harder to find. I have l...

thanx, I will have to take a look, but... That will involve clipping the pin enough so it doesn't contact the socket, then putting a wire to +3.3 I'm uncertain if I can do that. The traces going to the socket are difficult to trace :) and I haven't figured out what goes where yet, so modifying the i...

Hi I have a laptop motherboard that has a fixed 2.5x multiplier, I have gotten a socket 7 pin diagram once more and plan on hard wiring it to 3x. I have a pentium 200mmx chip that has two "working" multipliers 2.5x and 3x Anyway, is it possible to take 2.5x BF0 - 0 BF1 - 0 and set it to 3x BF0 - 1 B...

I really didn't see much of anything inside that could be used to configure the unit, I also didn't see the old fashioned "break box" (the little flat copper strips you could break) I guess I will have to do something I haven't done in a while and hard wire the system. If I clip a pin I should end u...