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Re: soj-dip adapter

I had planned to make more but things never got that far, I have a bag of PCBs and pins though not the SRAMs needed. After move is done I can do some on request. (I have PCBs for 32 and 128KB chips) Would you share your gerbers for us to start playing with? I see you have solder pads for both 0805 …

Re: soj-dip adapter

My point is that soldering pins on the bottom like that will be hacky and messy. Potential options: 1. A separate PCB with SOJ socket on it (or simply solder pads) that can be inserted vertically into the base one with the DIP pins using a SIPP-like connector. This way we can modularize the …

Re: soj-dip adapter

This is what you're looking for. 2-layer PCB, nothing special except how the pins are soldered. There's some free space left, so I would probably add a 0805 capacitor. Do we have a gerber for that? No gerber unfortunately. These were manufactured in the late 1990's. I only have a few units left and …

Re: 3 (+3 more) retro battle stations

Had a thought, is it not possible to build faster 72pin dram say in the sub 50ns speeds from existing chips? Like what was done with megacache but with dram? Wouldn’t that allow us to run at the fastest timings at these higher FSB speeds? Easier said than done I know, but theoretically yah? 1-cycle …

Re: NexGen Nx586-P90

This mod is still on my list. The ICs have been sitting in a bin; I'd have to take the motherboard out of the case though. Did you just replace those 8 chips, or was there more to the mod? Did you use solder paste, or solder the pads one-by-one with a contact-based soldering iron? When you say that …

Re: 3 (+3 more) retro battle stations

ph4ntom, what part number are you using for the capacitors, which for the zero delay F244's, and which locations? Thank you. You can see two Motorola F244 chips in the photo above just between tag and data cache chips. I have put TI SN74CBT3244DW instead. I think the capacitors have been salvaged …

Re: 3 (+3 more) retro battle stations

I have also replaced all 0805 ceramic capacitors with 10uF ones. They were 100nF originally. Made a difference. You can see them in the photo above, they are taller. I'm also inclined to think those Cypress 10ns async SRAMs are rated rather conservatively and can do somewhat better. Although they …

Re: 3 (+3 more) retro battle stations

https://i.imgur.com/PUqPQSZ.jpg EliteMT LP61256 8ns tag and 8x Cypress CY7C199D 10ns data, 2-1-1-1 reads. Writes are slower, I guess that's my SiS 496 hitting the wall. I haven't noticed any difference between FAST and FASTEST in case of EDO memory, 5-2-2-2 burst reads and 5-3-3-3 burst writes. I …

Re: 3 (+3 more) retro battle stations

Put in one place the MS-4144 (4x50) and LuckyStar rev.D (3x66) numbers for 200MHz. The LSD board can climb much higher, but at compromised stability in some Win95 tasks/tests, used the results for fully stable system. Have you replaced cache chips on your LS-486E Rev.D? Those 15ns ones don't do any …

Re: 3 (+3 more) retro battle stations

That one isn't up for the job. SX1308 is a step-up DC-DC convertor. You need a step-down one doing 5V to 3.3V or so. Look for Mini-360 or Mini-560, they can actually do 2A with a decent efficiency. There are many step-down linear regulators of course, but not so compact and the heat they produce has …

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