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Magitronic 486 Tower

[Chris]

Experienced Member
Joined
Nov 8, 2013
Messages
83
Location
Corona, New York, United States
Here's my other Magitronic PC, a 486-class tower. Got it at the same place I got the Magitronic laptop, my workplace.

For the past few years, I've had a Magitronic keyboard (a rebadged Focus FK-2001 alps switch keyboard), and I've been wanting to find one of their tower PCs, until this one showed up in my workplace (an e-waste warehouse which also used to house a prop library until the current location's recent closure).

When I first found it, it only had a 5.25" floppy drive and the turbo panel, with the rest of the bays being covered by their blanking plates. Sports an AMI BIOS, and OPTi chipsets.

For expansion cards:
  • Video: Paradise PVGA1A
  • SCSI: Adaptec SCSI/Floppy combo card (For some reason, the Adaptec SCSI card was having issues detecting any hard drives at all, so I took it out but I still have it)
  • Serial/Parallel: Goldstar I/O card

As part of the effort to get this PC to work properly, I wound up harvesting parts from other 486/Pentium class vintage PCs which were DOA or had numerous issues, but their expansion cards were perfectly fine.

As for the add-on cards I added:
  • Creative Labs SoundBlaster with matching CD-ROM drive
  • Marvell 10 mbit Ethernet Card
  • GoldStar IDE/Floppy combo card with Parallel port with Mitsumi 3½" floppy drive

For spares:
  • Eagle by Microdyne 10 mbit Ethernet Card
  • 2nd GoldStar IDE/Floppy combo card with Parallel port
  • Turtle Beach Pinnacle Rev C with EIDE and WaveTable connectors
  • Creative Labs SoundBlaster 32 with IDE interface

I also had a 5.25" bay speaker system and added that into the mix. It currently has 8MB in 8 x 1MB 30-pin SIMMS (upgradable up to 64MB), which I have a 32MB kit on its way. It has an Intel i486 DX 33MHz. I do plan on replacing it with an AMD Am486 DX4 100MHz, but I am not sure where I can source a voltage regulator or find the jumper settings to reduce the 5v to the required 3.3v (Motherboard is a model A-B435 if it helps). If that fails, I still have a 486DX2-66 as a backup.


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...and before you ask, yes I know about the battery, that's getting replaced with a battery holder to use off-the-shelf parts, it thankfully hasn't harmed the motherboard at all.
 
I always see Magitronic motherboards for sale (often in box). I have never seen an actual Magitronic PC though. Seems kind of generic. What happened to the case badge?
 
I always see Magitronic motherboards for sale (often in box). I have never seen an actual Magitronic PC though. Seems kind of generic. What happened to the case badge?

Probably fell off over the years. I hope to have a new one made. This one I'm hoping to turn it into a decent MS-DOS gaming system.

Except for the expansion cards, There are Magitronic labels on the Motherboard, the case, 5.25" floppy drive & the PSU, but is otherwise just your typical early-90s beige box. This one has an inspection date of July 8, 1992.
 
So the most recent changes:
  • 8MB > 32MB of RAM (30-pin SIMMS)
  • 486DX-33 > 486DX2-66
  • 4GB > 6GB via OnTrack Disk Manager DDO
  • MS-DOS 7.1
  • Currently equipped with both the SB16 and the Turtle Beach Pinnacle
  • Swapped CD-ROM as the one that is original to the SB16 is non-functional

Main problem is figuring out whether this motherboard supports autovoltage detection, as I have an Am486DX4-100 that I want to put on this PC. Even though this PC was built in 1992 (but the BIOS date is from 1991), it has the pinouts for 2 72-pin SIMMS, while still having the 8x 30-pin SIMMS.

I also want to increase the cache from 64K to 256K or maybe 512K if thats even possible.
 
I’ve got a couple of copies of magitronic OEM version of MS-DOS 5.0 on 5.25” floppy, but I think they just stuck the MS bits on disks and put them in a envelope to stick in the box with the computer, because I cannot seem to find anything “customized” about them.
 
Hi, I just came across a Magitronic RS-232 Adapter card along with a Reference Manual to go with it. Any interest in these items?
Thanks
Bill
 
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