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Assuming, for the moment, that you mean "cart save RAM" when you wrote "VRAM" ... LoROM carts connect extra address lines in order, skipping A15. (So a 2KiB RAM is connected to A0 through A10; 8 KiB to A0-A12; 32 KiB to A0-A14; 128 KiB to A0-A14 and then A16 and A17) HiROM carts connect address lin...

Hey All, Where would the extra address lines need to be routed to expand the VRAM from 8k to 32k? Would it be different on lorom VS hirom? The 8k footprint being 28pin is nice and a little easier for placement but I was also considering if a 2k could be replaced with a 32k as well? I have a 1a1m lor...

That's really weird. There's nothing obvious about the schematic that would make it obviously incompatible with both the Justifier and Menacer - there just aren't that many ways for a lightgun to work, given that the Genesis only supports "capture" on the TH pin. I was told that the LM311 leans to ...

I'm just gonna covert this to a player 2 "pink" justifier gun I think. Clearly after all this testing and research the American Laser Games GAMEGUN is not compatible with justifier or menacer games at all. I'm happy this is now at least "out there" to discredit the rumors and false claims that it co...

OK so now I'm finding out that ALG used a different hit detection method than Konami did for their gun games and hardware. Still I would think this homebrew test program should work as it's for all 3 kinds of lightguns but I'm still rolling snakeyes with this POS I have here..lol.. http://gendev.spr...

Here it is with all new through hole parts. Still nothing. I'm really at a loss. I wish I could find someone electronically inclined who also owned one of these guns. You guys have been great helping based on theory and what should work in practice and I thank you for it. The only thing that is orig...

TmEE wrote: ↑

Tue Mar 24, 2020 4:40 pm

Do controllers work properly in both controller ports ? Many MD models develop cracked solders at the controller ports, causing all sort of headache...

Yep they work properly. I considered that as well.

Well this sucks. I replaced every last piece of population on this hunk of shit and it's still pretty grim. I even replaced the cord just in case. I'm hoping one of these smd's might have burned when I put them on, I highly doubt it, but that is why I bought an equal amount of through hole parts to ...

I ordered parts to replace everything on the pcb the other night. I'll replace the through hole components and the transistor first in hopes that does the trick. If not I'll start replacing those smd resistors and caps as needed. 2mm parts suck to work with...lol..

... I totally remember by trigonometric identities. radius/separation, not vice versa. Sigh. Anyway, atan(1.5cm÷2 / 10cm) = 4.3°. So is 4.3 degrees the viewing angle? You just jumped one step above my pay grade with the "atan". That is totally new to me and I know nothing about it aside from the fo...

You probably want to choose a half-width matched to the barrel of the lens then. What's the diameter of the far lens, and how far will the photosensor sit from it? There's no utility, and maybe some harm, in choosing a phototransistor that has a half-width larger than atan(separation/(lensradius/2)...

You never did answer what the barrel of the GAMEGUN looks like...? Sorry I missed that. Pic attached: DSCF0330.JPG The sensor just sits in the middle of an orange plastic circle than then down the barrel at the end is a clear and somewhat magnifying plastic circle. Similar type insert found in most...

I think you'll be fine with a 1N4148. The diode is just there to absorb energy from the inductor when the 2N3904 stops conducting - otherwise the energy will charge the node to some high voltage. That is what I thought as well. Thanks for confirming that. Also thanks for the clarification on the va...

In contrast, DigiKey doesn't even let you filter by turn on/off time, and Mouser implies it's rather difficult to get phototransistors that are anywhere near as fast as the original MRD310. I came across this info while googling around from a seller with lots of parts: Silicon NPN Phototransistor D...

Anyhow, so that is most likely an 1n4148 correct? or would it be something else? Most likely, yes. Stored energy in the inductor is going to be around 75mA→16µJ at max, so an ordinary signal diode should be fine. Although it's possible that something faster would be better... Anything you want to r...