EduQuest Model 40 (a turbocharged Model 25) 9604-04X
Planar Outline
Option Cards
I picked this up from a computer recycling collection. Don't know much about it, but it is the last IBM Model 25 series system I needed to get. This is much bigger in size than your average Model 25.
At present I do not have much information about operation or maintenance of the system. IBM doesn't appear to have any information concerning it nor does the Web in general. While your EduQuest system may vary a little from these specs, this is how my system is set up right now.
Intel 486SX-25 CPU (soldered) with an OverDrive upgrade socket available.
20MB Installed RAM
1.44 Floppy Disk Drive
1.2GB Hard Disk and Windows 95 OSR 2
DOS 5.0 is in ROM on mine. A Setup utility is built in, there is no reference or starter disk I know of. No idea of how to get into setup other than to hold a key down on the keyboard and cause the system to complain of a keyboard error.
I have found that use of a disk manager (those based on Ontrack software) requires a "cooked" diskette as the EduQuest Model 40 cannot boot the DR-DOS used with Ontrack's solution. I will be providing a "cooked" disk image here soon.
Over 528MB hard disks are not supported without the help of a disk manager program for certain. I don't know if the onboard SCSI supports more disk capacity or if it is even bootable.
Planar
You may notice that I don't have a whole lot of information on this system. IBM doesn't seem to have any info that I can find, and I've searched the web only to discover that I am one of the few people providing information on this system. If you have information on either the EduQuest 40 or any EduQuest, and it is preferably of a technical nature, please do send it to me for inclusion on this site.
Jumpers/Connectors/Plugs:
JP1 - Open for video disable, close for video enable
JP2-5 - No Idea, 2 and 4 closed on my planar
JP8 - Reset Switch
J5 - SCSI Connector
IDE - IDE Connector
FLOPPY - Floppy Connector
J6 - Pads below J5, possible external SCSI port option?
VESA FEATURE - VESA Feature connector
SIMM 1-4 - 30 Pin SIMM Sockets
Components:
X1 - 12.000MHz XTAL
OSC1 - 24.000MHz
OSC3 - 50.000MHz--halved for 25MHz CPU clock
D4 - Power LED
U9 - MUSIC MU9C4870-80DC Video DAC
U13 - Benchmarq bq3287MT
U14 - Samsung KM416C157AJ7 70NS VRAM (512K)
U15 - VLSI/Future Domain TMC-950 SCSI
U20 - Intel 8042 KBC
U21 - Upgrade VRAM Socket (another 512, total of 1MB)
U23 - Video and System ROM BIOS
U24 - Empty socket marked as MASK ROM on board
U38 - ATI Mach32 Video Chip
U39 - ROM DOS 01 - MS-DOS V5.00
U40 - ROM DISK 01b (contains device drivers used by ROM DOS)
U51 - Soldered Intel 80486SX-25 CPU
U53 - 80487 Math-Co or Overdrive "ODP" CPU Socket (also can be used with normal 486 CPUs)
U54 - VLSI VL82C486-FC2
U60-U67 Samsung KM44C1000BJ-7 (4MB onboard RAM)
20MB RAM is the maximum supported amount you can install. 4x4MB in the SIMM sockets and 4MB on the system board.
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