Re: OSSC cropping part of VGA input?

Posted on Yesterday, 14:11

by

by maxtherabbit

in Marvin \ Video

in Marvin \ Video

I wish we could go back and find the "clever" engineer that decided to have two modes with the exact same total line count and refresh but different pixel clocks and kick him in the dick

---

Re: Dual Pentium Pro Build Thread

Posted on Yesterday, 14:07

by

by maxtherabbit

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

At 3.8V with power consumption *that* high I wonder if P2B-D VRMs are even capable of delivering enough power. Especially with those 25 years old capacitors. I'd swap them for solid-states. One more thing that can be done for stability is solder additional SMD ceramics directly to Socket pins, …

---

Re: The return of the Northwood

Posted on 2025-01-12, 00:57

by

by maxtherabbit

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Every time I see this thread title pop up in active I read it as "norwood" and think it's about balding

---

Re: Project: Full Can Clock Oscillator Replacement

Posted on 2025-01-10, 22:00

by

by maxtherabbit

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Left room for the obligatory zip tie between the programming header and buttons I see

---

Re: Dual Pentium Pro Build Thread

Posted on 2025-01-09, 12:50

by

by maxtherabbit

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

arti9m wrote on 2025-01-09, 04:24: I bet you also wouldn't allow sharing modified BIOS copies you actually sell. Thankfully, those are not needed anymore. Cheers to that

---

Re: Problems adding a CD-ROM drive to a Compaq Deskpro 386/25M

Posted on 2025-01-02, 13:59

by

by maxtherabbit

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

That took quite a while 🥳 The memory test was very revealing, six out of eight of the 8MB SIMMs are faulty, but only in a single memory nibble within the entire 8MB stick. The faulty modules are all Kingston KTC-8000N 70ns FP Parity. So I'm left with two KTC-8000N modules and the 4MB on board for a …

---

Re: Add second ISA slot to P3B-F

Posted on 2024-12-31, 15:06

by

by maxtherabbit

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

If it fits and solders down it's proper. You can't see the bends anymore after that 😀

---

Re: IBM 5160 + 5153 CGA setup

Posted on 2024-12-30, 16:42

by

by maxtherabbit

in Marvin \ System Specs

in Marvin \ System Specs

You don't really need the extra side bracket if your case has the bottom mounting hole. Is there a plastic circle insert on the underside of your chassis? What you're really missing is the black plastic trim bezel that's supposed to snap around the drives after they are installed

---

Re: IBM 5160 + 5153 CGA setup

Posted on 2024-12-30, 15:39

by

by maxtherabbit

in Marvin \ System Specs

in Marvin \ System Specs

Was there an extra bracket that was only on the left side? Looks like this Filename 20241130_231743.jpg File size 61.89 KiB Views 337 views File license Fair use/fair dealing exception

---

Re: trigger ATX psu with an AT switch

Posted on 2024-12-30, 15:03

by

by maxtherabbit

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Did you ever check the physical dimensions of the existing toggle switch?

---

Re: IBM 5160 + 5153 CGA setup

Posted on 2024-12-30, 14:57

by

by maxtherabbit

in Marvin \ System Specs

in Marvin \ System Specs

You have the original IBM half-height to full-height mounting brackets. These are "rare" and I would strongly advise not removing them from the system. They require the drive assembly to be inserted through the *rear* of the drive bay not the front. As such, only IBM-spec drives from Alps and YE- …

---

Re: trigger ATX psu with an AT switch

Posted on 2024-12-30, 14:50

by

by maxtherabbit

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

That's not surprising. The motherboard expects to be controlling the soft power of the PSU when being fed through the ATX connector. I think you should just use the ATX to AT adapter (or better yet source a real "AT" (LPX) PSU)

---

Re: Problems adding a CD-ROM drive to a Compaq Deskpro 386/25M

Posted on 2024-12-29, 02:06

by

by maxtherabbit

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

The deskpro/m has integrated IDE in the IO/audio board under the PSU. I can't comment on running an IDE CDROM on it thought, I use SCSI on mine

---

Re: Windows for Workgroups TCP/IP Disk

Posted on 2024-12-24, 23:30

by

by maxtherabbit

in Marvin \ Software

in Marvin \ Software

"C:\windows\net start", however, displays: "Error 2182: The requested service has already been started.", and doesn't map network drives in DOS. I cannot duplicate this, and it doesn't make sense. Are you saying you ran the command "NET START" for the first and only time at bootup and received this …

---

Re: trigger ATX psu with an AT switch

Posted on 2024-12-24, 23:25

by

by maxtherabbit

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

You could remove the switch and measure the cutout. Most likely it's the Taiwanese "standard" 25x25mm in which case you're out of luck. If however it was the smaller 22x19mm like the classic macs used, then this switch would work as a replacement: https://www.digikey.com/en/products/detail/e-switch/ …

---

Re: trigger ATX psu with an AT switch

Posted on 2024-12-24, 22:18

by

by maxtherabbit

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Oh I'm sorry, you have the toggle type. I assumed it was the push button variety

---

Re: trigger ATX psu with an AT switch

Posted on 2024-12-24, 18:22

by

by maxtherabbit

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Why not just replace the latching power switch on the AT case with a momentary one? They are available in the exact same form factor from ebay/aliexpress

---

Re: 193 copies of VGA card in Device Manager

Posted on 2024-12-24, 18:20

by

by maxtherabbit

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Try reinstalling 98 but this time run "setup /p i" this will disable ACPI without any changes to the BIOS or CMOS setup parameters

---

Re: Data Delivery Board

Posted on 2024-12-24, 15:11

by

by maxtherabbit

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Are you positive this thing is actually an EISA card and not some proprietary interface with the same edge connector? (they exist)

---

Re: Windows for Workgroups TCP/IP Disk

Posted on 2024-12-23, 12:35

by

by maxtherabbit

in Marvin \ Software

in Marvin \ Software

Results: - WORKGRP.SYS complains: "No NETBEUI section found in configuration information", but loads anyway Yes this is expected and can be safely ignored as mentioned in the MS docs - Windows complains on startup: You started the workgroup software for MS-DOS before you started Windows. To make …

---