Re: The coolest socket 7 motherboard that you’ve never heard of
Posted on 2022-08-29, 02:57
ICS9148-58 is actually quite decent PLL that supports 112, 124 and 133MHz settings both using jumpers and I2C PDF
Re: soj-dip adapter
Posted on 2022-08-29, 02:31
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.
Re: 3 (+3 more) retro battle stations
Posted on 2022-08-28, 00:20
I don't think 10ns DIP async SRAMs were even manufactured. The best approach is to solder fast SOJ async SRAM to PCB adaptor.
Re: 3 (+3 more) retro battle stations
Posted on 2022-08-26, 20:48
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: Old hardware giveaway thread.
Posted on 2022-08-20, 23:16
Outcast Congratulations! I overlooked that game because of mine own bias - who'd want to play this game? haha..! Well, I have played it again earlier this year for some reason. The graphics looks surprisingly good for an engine without any hardware 3D acceleration running on pre-Y2k machines. Sound …
Re: Old hardware giveaway thread.
Posted on 2022-08-20, 21:51
Outcast
Re: NexGen Nx586-P90
Posted on 2022-08-18, 02:25
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: NexGen Nx586-P90
Posted on 2022-08-17, 18:42
By the way, Nx586 runs very nicely with 1Mb of cache. Much better than with 256Kb of which 64Kb reserved for microcode.
Re: 3 (+3 more) retro battle stations
Posted on 2022-08-15, 14:07
I was thinking that MC74F244 was specified with a propagation delay of 4ns typical / 6ns max, so zero delay may help with a 66MHz bus. Won't hurt anyway and these don't cost much.
Re: 3 (+3 more) retro battle stations
Posted on 2022-08-15, 11:07
I replaced all 0805 +5V bypass caps near the chipset, cache, memory and CPU. They were of the same value. It helped with stability, but there were several mods in queue, so not measured the effect except my Cyrix 5x86-120 S1R3 could do 2x66 after at 3.45V instead of 3.6V.
Re: 3 (+3 more) retro battle stations
Posted on 2022-08-15, 02:14
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
Posted on 2022-08-14, 20:00
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
Posted on 2022-08-12, 02:30
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
Posted on 2022-08-10, 20:20
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
Posted on 2022-07-13, 19:19
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 …
Re: 3 (+3 more) retro battle stations
Posted on 2022-07-09, 23:19
It's all fine, but 486BL3 is a 3.3V part with 5V tolerant I/O. It gets damn hot even at 50MHz with 5V. I would cut all Vcc pins on the adaptor and use a DC-DC convertor to supply something under 4V. > Not sure 3.3V will be fully stable at 100 or more MHz, but still. Needs more than 3.3V for 100MHz, …
Re: S3 ViRGE VLB project (or " Making a Concurrent for Creative 3D Blaster VLB" )
Posted on 2022-02-18, 18:45
I actually have a few hundred of these SOJ-40 sockets on a reel. Could be used with more spacing between the chips on the PCB. Also those S3 Trio/ViRGE chips have weak 135MHz RAMDACs which blur the image at higher resolutions. They cannot even do 1024x768x32bpp without interlacing, so there's no …
Re: The World's Fastest 486
Posted on 2022-02-10, 16:21
BitWrangler wrote on 2022-02-10, 15:47: Nobody likes 180 though, it doesn't sound like a real speed, how about we rename it to "166+ Turbo" Even Intel sold 180MHz PPro and Pentium MMX Overdrive.
Re: An analysis of Warcraft 2 MIDI music on Roland synthesizers
Posted on 2022-02-04, 23:20
Roland SC-88 came with a 64-voice polyphony as well as the first Yamaha XG compatible synth, the MU-80. Although there were cost reduced models like MU-50 with only 32 voices. Although that's year 1994 for the SC-88 and 1995 for the MU-80 while the SC-55 was introduced in 1991. I recall E-mu Proteus …
Re: Lets make new M919 Cache sticks?
Posted on 2022-01-27, 17:11
Sure thing it will do the job without much overclocking. Just checked, those IDT71V124SA12Y chips you put in are rated at 130mA each. That's 1.2A additional current on that LDO regulator. It doesn't seem real tough, could be an issue.
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