VOGONS


Reply 40 of 46, by RayeR

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Thanks for effort, thankfully my vision is still sharp enough to see this pins w/o mag. lens 😀

Now we have important OE and CAS signals that are grouped by 2 chips for 64b data bus width, but I'm missing the RAS. I belive it should have 2 separate pins as CAS has. You probably missed it but try also J4-D30 and J4-D29 that are RAS of onboard chips.

I wonder a bit about J4 A23 that is connected with B30 on the card but not on module, maybe used on 12MB version.

Also I need to figure data bus mapping so please check at least J4-A12 (DQ0) and J4-C3(DQ0) which goes to what chips (pin 5 on mem.chip)
and similar for J4-D21,C21,A21,D20 (BE0-3) and J4-B23,C22,B22,A22 (BE0-3) which goes to what chips (pins 119, 98, 120, 97 on mem. chip)

Also not clear about SQ0-15 lines that each onboard chip have them separate but I guess it would be also separately connected to 4 mem chips. on module, so please check at least J2-C25(SQ0), J2-C19(SQ0), J2-D13(SQ0), J2-D4(SQ0) which goes to what chips (pin 32 on mem. chip). This pins seems to have 33ohm resistors in series so be sure your DMM beeps at this resistance yet.

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Reply 41 of 46, by RayeR

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One of my friends found a 4MB expansion module and was so kind to send it to me so I will be able to beep all necessary connection myself so I hope the schematic will be completed soon 😀
Anyway thanks for effort!

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Reply 42 of 46, by Dusko

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That's great news! I was going to look into it during the weekend. Share some pics once you have it all together! It's a cool project!. You should keep an eye on ebay, you may find one near you at some point.

Dusko.

Reply 43 of 46, by RayeR

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I sometimes checked ebay for years but didn't have a luck. In our country it was pretty expansive professional card that was not much common used so there was even much less memory modules. All cards I saw offered on local secondhand servers was without module.

Today I received the package with friend's Mill2. It's 8MB version with 4MB module as you have. I plug it in my BX133 raid and play with it for a while. At 1st I wondered that my VESATEST detected only 4MB LFB. So I updated video BIOS from 1.1 to latest 1.5 and then got reported 12MB LFB but still there was only few truecolor modes and 1600x1200 only in 16bpp. I tried also load UNIVBE 6.7 and it increased number of VESA modes from 24 to 33 while added the highest truecolor mode 1280x1024/32 - I'm still missing 1600x1200/32 (142h). I know that this higher truecolor modes was not fully standardized by VESA but I hoped at least UNIVBE would help, a bit disappointed. This mode should be available at least in Windows and DOS CAD programs that have native MGA drivers (like Vibrant for 3D Studio).

I also bought that AGP Mill2 as a donor of memory chips. I tested it and it works fine. Due to AGP it has better LFB throughput - 180 MB/s but there are better cards to be plugged in AGP...

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Reply 44 of 46, by RayeR

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I have finished the schematic. RAS# signal is common for all 4 chips on the module and chips A7, A8 on board
http://rayer.g6.cz/hardware/retropc1.htm#MGAMEMRE

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Reply 45 of 46, by RayeR

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Routing in progress...

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Reply 46 of 46, by RayeR

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Routing is done.
http://rayer.g6.cz/hardware/retropc1/mempcb1.png
http://rayer.g6.cz/hardware/retropc1/mempcb2.png
I just have to finish some other small PCBs and I will send it to JLCPCB manufacturer...

Gigabyte GA-P67-DS3-B3, Core i7-2600K @4,5GHz, 4GB DDR3, 128GB SSD, GTX670(GF7900GT), SB Audigy + YMF724F + DreamBlaster combo