Re: Custom made, 50ns, FPM, Simm 30, memory modules with parity.

Posted on Today, 02:12

by

by maxtherabbit

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

galanopu wrote on Yesterday, 11:56: I also managed to beat my 386 overclocking record with 0WS at 51.2MHz. Bro what? 50ns is barely fast enough to do zero wait at 25MHz

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Re: How to: IBM 4865 external 720k floppy drive (Alps DFL413C02B) head alignment

Posted on Yesterday, 15:51

by

by maxtherabbit

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Alignment using IMD It's actually pretty simple once you get to using IMD. I'd suggest checking out these two links that explain the process quite well - this is what I read first. https://vswitchzero.com/2018/05/07/5-25-floppy-drive-alignment/ (and the old thread link too) And from Dave Dunfield …

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Re: How to: IBM 4865 external 720k floppy drive (Alps DFL413C02B) head alignment

Posted on Yesterday, 13:59

by

by maxtherabbit

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Proper head alignment is done with a special analog alignment disk and an oscilloscope. Aligning a drive using the IMD beeper is ghetto and should only be done as a last resort

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Re: Mitsubishi MF355F-250MG HD Floppy - only reliable with DD disks

Posted on Yesterday, 13:56

by

by maxtherabbit

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I doubt the alignment is the issue. Both DD and HD 3.5" are 80 track. It's definitely something electronic in the read channel

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Re: How to: IBM 4865 external 720k floppy drive (Alps DFL413C02B) head alignment

Posted on 2021-04-11, 14:25

by

by maxtherabbit

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Hi, I have the exact same problem with my drive. Could you go into detail with the process you did. I would love to fix mine as its been bugging me for a long time. :) I couldn't get ImageDisk reading my drive as its mapped to D: (Seems to only allow A and B) Cheers, IMD doesn't care about DOS …

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Re: Datalight ROM-DOS 7.1

Posted on 2021-04-09, 15:01

by

by maxtherabbit

in Marvin \ Software

in Marvin \ Software

maybe I'm missing something, but unless you are running this from a physical PROM chip, why bother? use PC or MS DOS

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Re: 286 dead, long live the 286! Sourcing and building a fast 286 replacement

Posted on 2021-04-04, 00:30

by

by maxtherabbit

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Here's the XL running at 20MHz

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Re: Problem Mouse PS2 to Serial

Posted on 2021-04-03, 15:33

by

by maxtherabbit

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Those adapters exist for the mice that actually support it. I know that, but those are few and far between and I'm sick to death of having to explain to people that it won't work on their optical mouse or whatever. Even amongst the mice that did support both serial and ps/2 signalling, there was no …

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Re: Problem Mouse PS2 to Serial

Posted on 2021-04-03, 14:06

by

by maxtherabbit

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I wish those adapters simply didn't exist. Your mouse does not support serial protocol, it won't work no matter what you do.

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Re: Which is the best and most memory efficient CD-driver?

Posted on 2021-04-02, 14:18

by

by maxtherabbit

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

No, when the driver is not loaded the card does not have a page frame. It's software configured. Again the card simply being in the system was breaking the cdrom, regardless of where VIDE-CDD was loaded in memory

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Re: 3 (+3 more) retro battle stations

Posted on 2021-04-02, 02:09

by

by maxtherabbit

in Marvin \ System Specs

in Marvin \ System Specs

motherboard : VLSI VL82CPCAT-16QC cpu : Intersil CS80C286-25 25/30MHz fpu : IIT 2C87-20 22MHz ram : 4Mb 60ns parity FPM vga : Diamond SpeedSTAR 24 1Mb (Tseng Labs ET4000AX, 24-bit DAC) (primary) Diamond Flower VG-1000 rev 2 512Kb (Cirrus Logic CL-GD510/520) Trident TVGA8800CS rev 2.0 512Kb Western …

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Re: Sound card options for a 386SX

Posted on 2021-04-02, 01:40

by

by maxtherabbit

in Marvin \ Sound

in Marvin \ Sound

ALS007

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Re: Which is the best and most memory efficient CD-driver?

Posted on 2021-04-02, 00:50

by

by maxtherabbit

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I might have to once again correct my findings about VIDE-CDD. Loading it low may have been a red herring in my case, I am still having issues with this particular system. EDIT: Yep, even when VIDE-CDD was loaded low and the EMS driver was NOT loaded the CDROM was still having issues. So I …

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Re: 286 dead, long live the 286! Sourcing and building a fast 286 replacement

Posted on 2021-04-01, 12:57

by

by maxtherabbit

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

pshipkov wrote on 2021-04-01, 07:35: The state of this pin does not make a difference. That statement directly contradicts the 287XL datasheet from Intel. Unless of course you are using a different FPU?

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Re: Which is the best and most memory efficient CD-driver?

Posted on 2021-04-01, 01:23

by

by maxtherabbit

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

DOS CDROM stuff is all PIO... I'am pretty sure thats incorrect. Just look at the Bus Master driver package from Triones for Intels Triton chipsets. Or adaptecs CD driver for their scsi cards, or early CD-ROMs with proprietary connector. I attached some readme from the high speed cd-rom driver …

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Re: Which is the best and most memory efficient CD-driver?

Posted on 2021-03-31, 22:29

by

by maxtherabbit

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

DOS CDROM stuff is all PIO, so AFAIK being DMA capable or not shouldn't matter. I haven't really tried to formulate a theory of my own yet, but I would lean toward a software limitation or bug either in VIDE-CDD or possibly the EMS driver itself

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Re: Which is the best and most memory efficient CD-driver?

Posted on 2021-03-31, 21:41

by

by maxtherabbit

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Really? I always DEVICEHIGH it and don't recall any issues. Same here I will echo that experience . I actually have to rescind that statement lol... I was just testing a system that was previously working fine with VIDE-CDD loaded high. Buuuuut when I added hardware EMS to the system, CDROM games …

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Re: Advice using OSSC with Windows 98 PC

Posted on 2021-03-31, 15:44

by

by maxtherabbit

in Marvin \ Video

in Marvin \ Video

Specifically, the standard timing for the 640x400 graphics mode has a horizontal total of 800, not 832

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Re: 286 dead, long live the 286! Sourcing and building a fast 286 replacement

Posted on 2021-03-31, 14:09

by

by maxtherabbit

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

So i tried few things with the FPU: VL82C201:46 (PROC CLK) -> FPU:32 = the original FPU performance the motherboard produces, FPU ticks with the processor frequency VL82C201:47 (SYS CLK) -> FPU:32 = FPU performance drops slightly compared to the first case VL82C201:53 (MHZ7) -> FPU:32 = FPU …

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Re: Having Trouble Getting Windows 2000 SP4 to Run on my FIC PN-6210 Dual Pentium Pro System with Dual 1MB 200Mhz PPros.

Posted on 2021-03-30, 04:35

by

by maxtherabbit

in Marvin \ Software

in Marvin \ Software

Interesting solution. I have seen legacy USB support be quite buggy on early boards before, but this is a new one to me. On my pentium pro for example the legacy USB support simply does not work, and on my SS7 system enabling it caused some type of weirdness that I can't recall ATM

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