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Re: Dell Optiplex 433 or 466 cache buffer missing (486)

Posted on 2022-01-03, 18:11

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Yes, it is strange. I have read that Dell & IBM motherboards of that time could have similar compatible stuff. Here is datasheet for that TAG: https://www.alldatasheet.com/view.jsp?Searchword=MCM6265CP15 and it says 8K x 9. I have verified that U55&57 are 74F245N and TAG is MCM6265CP15. You can see …

Re: Dell Optiplex 433 or 466 cache buffer missing (486)

Posted on 2022-01-03, 17:32

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Yes, looks like I made a progress. Just ordered MCM6265CJ15. Thank you!

Re: Dell Optiplex 433 or 466 cache buffer missing (486)

Posted on 2022-01-03, 17:24

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

EDIT: Tag looks like 8K x 9 Bit Fast Static RAM

Re: Dell Optiplex 433 or 466 cache buffer missing (486)

Posted on 2022-01-03, 17:21

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I have additional photo from E-Bay. Tag ram is MCM6265CJ15 = 15ns, probably 64k (this could be it!) Cache looks like IDT chip 20ns (some have Alliance chip 20ns) So that should be correct. I have tried tag 20ns (Alliance) and 15ns (Winbond) and no luck so far. I have ordered 1x Winbond 15ns and 4x …

Re: Dell Optiplex 433 or 466 cache buffer missing (486)

Posted on 2022-01-03, 16:27

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

In the end 74F245N (SN74F245N Texas Transceiver LED Driver 8-Bit-Bus DIP20) seems to work, but now I have a problem with cache. I used 20ns cmos sram for both tag and cache: Alliance AS7C256-20PC. I know it supports only 128kb of cache total. I have around 20 chips total and tried to put them …

Re: Dell Optiplex 433 or 466 cache buffer missing (486)

Posted on 2021-11-26, 18:03

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Ok, it might be 74F245, latch version of ttl.

Re: Dell Optiplex 433 or 466 cache buffer missing (486)

Posted on 2021-11-26, 14:50

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Adding more photos, you can see 74F245 is onboard and wired to these two buffers.

Dell Optiplex 433 or 466 cache buffer missing (486)

Posted on 2021-11-25, 23:24

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Hi, I bought Optiplex 433/LE and it has missing both buffer and cache. I got 15ns cache and for buffer it should be TTL, but 74F244N is not working. No pc speaker noise, only hdd led goes on and screen will not turn on. I also tried latch version 74F643 os=r something like that. Does anyone know …

Re: Got my Dell 466/L working! Now I need some parts.

Posted on 2021-11-07, 18:43

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Hi guys, I have Optiplex 433/LE and upgraded to 486dx2-66mhz. Now bios says 466 LE. My onboard L1 and L2 cache is completely empty. It does not take 128k obviously. Can you recommend something? Or share photo of the cache? What about that riser 3 slot with isa and vlb? It should support two vlb and …

Re: Mortal Kombat 2 Roland + SB Hangs

Posted on 2021-10-31, 14:48

in DOS

in DOS

I said sound plays only with dma=1 above, but it will always hang with dma=1 on my system. Setting dma to 0, 3 or 5 will not play any sound and will not hang.

Re: Mortal Kombat 2 Roland + SB Hangs

Posted on 2021-10-31, 14:45

in DOS

in DOS

Yes, it seems something with DMA. I came back here to post about it. I tried various irq/dma configrations. In bios these are reserved for ISA slot. In game options, when I pick some invalid dma, only midi music will play and it will not hang. I change SET BLASTER environment variable and verify the …

Re: Mortal Kombat 2 Roland + SB Hangs

Posted on 2021-10-31, 11:54

in DOS

in DOS

MK2 has support for Roland SCC1 + SB in the options. I tried DOS 6.22 and DOS 7.1. This game is using XMS 8MB memory, so first I thought it might be conflict with EMM386, similar to Carmageddon and games that use their own memory manager, but that did not help. Config files has only himem.sys and …

Re: SetMul - Multiplier control for VIA C3 / AMD K6+7+8 Mobile / Cyrix 5x86

Posted on 2021-10-24, 14:55

in Release Announcements

in Release Announcements

The original Bogomips on Linux were a timing loop calibration, not really a benchmark, and Pentium and MMX would get close to clock x 0.4 whereas K6 class would get clock x 2.0... however, this was later "fixed" at some point resulting in Pentiums also getting clock x 2... Anyway, what I'm saying …

Re: SetMul - Multiplier control for VIA C3 / AMD K6+7+8 Mobile / Cyrix 5x86

Posted on 2021-10-24, 11:11

in Release Announcements

in Release Announcements

I have tested K6-2+ with setmul. I am able to play some 386 games. So it works (multiplier set to 2 on FSB 100MHz, disabling BIOS cache and L1/L2 cache). But one thing I don't understand: Why Lotus still crashes with divider overflow? Another machine Pentium MMX 200MHz does not have this issue.

Re: PS/2 to Microsoft Serialmouse Adapter Converter / Updated First Post / Firmware Update added

Posted on 2021-10-19, 23:39

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Can I order this on Tindie or somewhere?

Crazy overkill build ideas post here: Oldest motherboard that supports server ECC registered SDRAM?

Posted on 2021-10-18, 18:56

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

My super socket 7 board supports ecc, bur probably non-registered and only 256mb ram modules. I bought 2x512 PC100 SDRAM ECC Registered modules because they were cheap...now I dont have motherboard for that. I want to build overkill retro machines, so 1gb memory should be maximum, or 4 slots and 2gb …

Re: 386 board that takes 64mb ram?

Posted on 2021-10-16, 10:42

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Ah, that is interesting with PC Chips. Because I have seen some auctions here in central Europe and it sold for 60 USD. While other brands sold for 30 USD. So I was thinking it is special, good quality 😁. Perfect, thank you very much! I will look for Opti 495 chipset and/or Shuttle HOT327.

Re: 386 board that takes 64mb ram?

Posted on 2021-10-14, 08:46

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I think PC Chips were quite good. lol PC Chips not good? I was thinking it is sought after. Anyway I did not know there is 386 with 72-pin RAM, I might look for that. Thank you very much guys! Im attaching picture of my current 386 build. My first computer was 486. It took me one year to collect …

Re: 386 board that takes 64mb ram?

Posted on 2021-10-14, 08:38

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Picture of a KMC-A419-8 here: http://www.amoretro.de/wp-content/uploads/kmc_a419-8_386_cache_motherboard_ali_m1419.jpg Looks very similar to the layout of a KMC-40A here [edit, change link to UH19]: http://www.win3x.org/uh19/motherboards/159 or https://stason.org/TULARC/pc/motherboards/A/ACER-INC- …

Re: 386 board that takes 64mb ram?

Posted on 2021-10-13, 14:05

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Jumpers will be similar to this, so 16mb is maximum. 4mb modules can fit only half of the slots: https://stason.org/TULARC/pc/motherboards/U/UNIDENTIFIED-486-KMC-OPTI291.html ...so I need to find a jumper settings for 386 board that mentions 32mb and then buy that board. I think PC Chips were quite …

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