Re: 3 (+3 more) retro battle stations

Posted on 2024-03-05, 14:11

by

by feipoa

in Marvin \ System Specs

in Marvin \ System Specs

Yeah I know, it can get messy, which is why I'd stick with the core hardware values and stick to a single line in small font. Any more and it would get cumbersome to read through. The 8 and 10 ns SRAM modules did not improve wait states at 180 Mhz on the M919. Still can only do 2-1-1-1, 1/0ws w/EDO …

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Re: 3 (+3 more) retro battle stations

Posted on 2024-03-05, 04:07

by

by feipoa

in Marvin \ System Specs

in Marvin \ System Specs

Nice and fairly complete charts again. The first thing that will probably cross the minds of other's when viewing the charts, is 'how can i replicate this?' - e.g. was pshipkov only using 256K WB on that UUD, how much RAM, what CPU voltage, and was a peltier needed to be stable inside the case. It's …

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Re: Anyone with working MPU-401 on a Cyrix MediaGX system?

Posted on 2024-03-04, 12:16

by

by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I was noticing that in the Device Manager, the sound driver, National XpressAudio, also contains a PCI bridge. Is the built-in sound PCI based? I figured that this could be why I couldn't hear sound in DOS. There is no National/Cyrix DOS driver that I'm aware of which would be used to setup MPU-401. …

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Re: The World's Fastest 486

Posted on 2024-03-04, 11:29

by

by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

froller wrote on 2024-03-04, 09:18: Test setup: AMD-X5-133ADZ, LS-486e Rev.D, 256kB L2 15ns, 2x32MB EDO 60ns, CL-GD5446. 0WS, cache timings turned down to "Faster" (2-2-2-2). Are you using identical BIOS settings for both configurations? If not, could you specify?

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Anyone with working MPU-401 on a Cyrix MediaGX system?

Posted on 2024-03-02, 07:00

by

by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Has anyone been able to get the MPU-401 interface working on a Cyrix MediaGX system? I've been trying to get my Chil & Phil + Dreamblaster S2 working on my Cyrix MediaGX system without any luck. No errors during playback, just no midi music and no LED activity from the Chil & Phil. Tried it in both …

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Re: Cyrix appreciation thread

Posted on 2024-02-24, 10:42

by

by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Well, the datecode is inline with the earliest 5x86 chips, but the font on both of those chips looks non-original. Could it be a fake...?, then I'll try it when there's a Socket3 motherboard on the test bench to see what it shows. I'm not sure what a test will show. Both my 80 MHz 5x86 chips tested …

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Re: eBay sellers can effortlessly delete their negative feedback

Posted on 2024-02-23, 22:05

by

by feipoa

in Milliways

in Milliways

I received a reply from eBay, however, I cannot determine if it is from a real person or some form of AI. I will attach the reply here: I tried to reached you out through the phone number registered on file but was not able to reach you, hence sending you this email. Allow me to inform you that we …

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Re: Cyrix appreciation thread

Posted on 2024-02-23, 21:08

by

by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Well, the datecode is inline with the earliest 5x86 chips, but the font on both of those chips looks non-original.

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Re: Cyrix appreciation thread

Posted on 2024-02-23, 08:48

by

by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Do you plan on leaving the labels on the CPUs? The presence of the labels may leave permanent discolouration on the ceramic over the years. I was looking at your Cyrix 5x86-80GP and thought the font was a little off, like the '0' was remarked. This is what my 80 MHz chip looks like next to yours. …

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eBay sellers can effortlessly delete their negative feedback

Posted on 2024-02-23, 08:31

by

by feipoa

in Milliways

in Milliways

Have you guys noticed this becoming more common place on eBay in the past 10 years or so? There are some really notorious sellers on eBay who appear to have 100% positive feedback ratings today, but were were in the 90's 15 years ago. I figured they must have been deleting their negative comments …

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Re: Lets make new M919 Cache sticks?

Posted on 2024-02-19, 03:34

by

by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Those look the correct parts, but I ordered from a different seller with name: Shop910355040, https://www.aliexpress.com/item/1005001375396914.html?spm=a2g0o.order_list.order_list_main.5.21ef1802erbguU $16 USD shipped for 10 pieces. Have you tried your Digikey sourced Cypress chips at 180 MHz, …

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Re: Lets make new M919 Cache sticks?

Posted on 2024-02-18, 21:28

by

by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I agree that the TSOPs are more of a burden to solder on because the pads aren't long enough. Using solder paste doesn't work well because of this. I found that using some tackier no-clean flux paste and hand soldering each pin worked best. All the ISSI 8 ns chips I used have been fine. I did not …

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Re: Lets make new M919 Cache sticks?

Posted on 2024-02-11, 22:16

by

by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I don't know why the Cypress chips didn't work. They were fake? There was one faulty piece which failed the whole chip? I don't know. It might be wise to order some IDT chips as backup in case your Cypress chips don't work. I ordered: Gold Thickness: 2U

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Re: Lets make new M919 Cache sticks?

Posted on 2024-02-11, 21:12

by

by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Did you go double thickness on the gold contacts? That's what I did on my order; it was about $6 more per order. Decision was based on forum comments concerning JLCPCB's poor quality contact finish.

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Re: Native PS/2 mouse implementation for 386/486 boards using the keyboard controller

Posted on 2024-02-09, 15:30

by

by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I noticed that the Lucky Star LS-486E rev.D upgrade guide uses 470 uH, which I assume maxtherabbit adopted. It was not clear to me why this value was selected. Is there any benefit in using the higher inductance? If you take a look at datasheet on VT82C42N / HT6542B you'll see the keyboard and …

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Re: Native PS/2 mouse implementation for 386/486 boards using the keyboard controller

Posted on 2024-02-08, 08:35

by

by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

On the 486 boards I looked at, I saw these inductors in an axial can or SMD and of value between 2 uH to 10 uH. I use 2.2 uH on my adaptors. I noticed that the Lucky Star LS-486E rev.D upgrade guide uses 470 uH, which I assume maxtherabbit adopted. It was not clear to me why this value was selected. …

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Re: Custom interposer module for TI486SXL2-66 PGA168 to PGA132 - HELP!

Posted on 2024-02-04, 12:35

by

by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I recommend doing all baseline testing with a 5V PGA-132 TI486SXL2-50. This will rule out any soldering/contact issues. I haven't had any detrimental SCSI DMA issues at 2x with L1 and L2 enabled for which cyrix.exe could not resolve.

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Re: IRC channel recommendations, and maybe a VOGONS IRC?

Posted on 2024-02-04, 01:50

by

by feipoa

in Milliways

in Milliways

are you guys in a IRC channel/server nowadays? I've been using UNDERNET since '94. I cannot seem to break the habit/tradition even to this day. Its mostly an idlers home now, but we still chat from time to time. There's no vintage computer channel that I'm on. There was one that got recommended to …

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Re: Lets make new M919 Cache sticks?

Posted on 2024-02-03, 14:40

by

by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I did some more extensive testing on the various IDT and ISSI modules for an on-the-edge stable Am5x86-180 MHz system at 2-1-2, 1/0 ws. Much fiddling around with EDO sticks is required. My conclusion is that the IDT 12ns (SOJ), IDT 10ns (SOJ), and ISSI 8ns (TSOP) are all about the same. Stability …

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Re: Biostar MB-8433UUD-A

Posted on 2024-02-03, 13:41

by

by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Yoghoo, start out with the most conservative timings, e.g. 3-2-2-2, DRAM read = 2 ws, then slowing improve upon them. You first need to ensure the slowest settings result in a stable system before pressing the accelerator to the floor.

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