SpritesMind.Net

Use the 98/NT/2K/XP version instead ? Ah, I should have clarified: this is a fix _for_ the 98/NT/2K/XP version. :D My problem is that it would work for a while and then stop working, and now I realized it's because I installed and removed software which adjusted the PATH length. On another forum so...

Sometimes SNASM68K crashes as soon as you invoke it under Windows XP. This problem has been driving me nuts, but here is the solution: Make sure your PATH environment variable is 250 characters or less . That's it! You can type "path" in the command prompt to see how big it currently is, and set up ...

tcdev wrote:Here's the completed schematic traced from my 1MB/8Mb DRAM Daughterboard...
http://members.iinet.net.au/~msmcdoug/c ... ematic.pdf

Fantastic, thank you very much for doing this!

I see how to trace a WORKING board, but not how to fix a broken one w/o a schematic then.... Yeah but now you have a schematic. :D Let's say you want to verify the DRAM data pins on either side of the corroded tracks on your board: On the DRAM connector you can see sixteen data pins, VD0-7 and VD8-...

thanks Charles... may I ask you how you were able to trace all of these lines ? there is a lot of them start or end below a chip or a connector.. A multimeter has a feature called a continuity test where you can place a probe on one pin, and the other probe on another, and if they are connected it ...

EDIT: I don't have U5,U7 (7408) or U6 (74HCT157) on my DRAM board. It only contains 8x DRAM chips (KM44C256BP-7) and caps. I know it would be really boring and time consuming, but is there any chance you could map the connections between the unknown eight DRAM signals from the connector (DCA-DCH) t...

it's stay green for ever... OK, that means it is never switching out of Mark-III mode. I wonder if it isn't physically driving the M3# pin high. The switch is pretty much instant, the BIOS enters a loop but really as soon as the write is done the machine automatically resets and restarts in Genesis...

A few interesting observations... I don't have the RC reset circuit (D2,R13,C23) next to the xtal. Not even the traces/pads on the PCB. (And FWIW there's two R13's on the circuit). Thanks for the bug report, I'll fix it. Cut and paste error. :D Is the reset input instead connected to the MRES# or V...

but if I select 'Run IC Cart', I have a green screen then nothing... Does it always stay at a green screen after 'Run IC Cart', or does it turn black? I know you have no LPT anymore, but if you can somehow, does running SMS ROMs using my smdutil program work? (you'd need the DRAM board installed) D...

It's a nightmare.... the battery was removed years ago so it's not it...unless the acid it released years ago had slowly killed my smd... http://gendev.spritesmind.net/img/smd/kaneda_no_smd.jpg (near 3M jpg) You could use a multimeter and do some continuity tests to see if the traces are damaged. I...

Charles, I believe you have the DRAM/cartridge size memory variables swapped in your document?!? Should be: The documentation is terribly out of date, so I'm inclined to agree. :D The memory mapping and ports are the same as SMS mode on the Genesis, so you'll see: 00-3F : I/O and memory control out...

Here are schematics for the Super Magic Drive http://cgfm2.emuviews.com/img/smd-main-v1.png I haven't added the disk connector and controller chip, and finished the parallel port connector. About DRAM refresh, I don't know how it works. Notice the EPLD can input DTACK but not drive it. Maybe it snoo...

My disassembly was for the "MAGIC DOS V-3.3" BIOS and it's pretty incomplete. I only went far enough to see how the PC<->SMD commands work. The 'smdtech.txt' file I linked to above describes the command in more detail. I've pasted the relevant parts here. "getbyte" and "sendbyte" are the routines th...

First of all, does anyone have a copy of Charles MacDonald's SMDUTIL? If you can't find something on my website feel free to send me an e-mail (and/or a followup if I forget to respond). I do try to answer every e-mail I get. Here's the current version with the DRAM test: http://cgfm2.emuviews.com/...

cool ! I was waiting for a cheap one to open and scan the board! so I second that : can you share with us the picture of the inside ? :) thanks Haha, glad there's so much interest in this thing. I was worried I was repeating efforts. :D http://img413.imageshack.us/img413/3413/cbrc.png There's nothi...