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Advent 4250 PC


CPUCyrix Cx486DX2 50Mhz in a socket 3 ZIF socket
MotherboardUA 4982
BIOSPhoenix Bios Version 4.03. Dated 08/02/94
Memory4MB RAM expandable to 64MB using 4 x 72 pin SIMMS
Cache8kb internal cache 0Kb external, upgradeable options to 128Kb / 512Kb
Hard Drive170MB
CD DriveNot Fitted
Video CardTVGA 9000i - 512KB
Sound CardNot Fitted
Keyboard102 New enhanced PS/2 Compatible Keyboard
Mouse3 Button PS/2 Style
Interfaces1x 9 Pin Serial RS232C set as COM2 on IRQ3
1x Centronics Parallel Port LPT1 on IRQ7
1x PS/2 Mouse Port
1x PS/2 Keyboard Port
1x Video connector
Expansion3 Vesa slots, 4 16 bit - AT compatible expansion slots

Motherboard Information

Cache

OptionTag RAM
U22
Cache Bank 0
U12,U13,U14,U15
128K32x832x8
256K32x864x8
512K32x8128x8

CacheJP4JP5JP6JP10JP11JP12JP13
128K
(32Kx8)
Short
1-2
Short
1-2
OpenOpenOpenOpenOpen
256K
(64Kx8)
Short
1-2
Short
1-2
Short
1-2
OpenOpenOpenOpen
512K
(128Kx8)
Short
1-2
Short
2-3
Short
2-3
Short
1-2
ShortOpenShort

CPU

The motherboard has a type 3 ZIF socket, and supports only SX, DX and DX2 Processors. Pentium processors to P24D standard only are supported.

CPU TypeJP14JP15JP16JP17JP18JP19JP400
Intel 80486SX/SX2OpenShort
2-3
OpenOpenShort
2-3
OpenOpen
Intel 80486DX/DX2
AMD Am486DX/DX2/DX4**
OpenShort
1-2
3-4
Short
1-2
OpenShort
2-3
OpenOpen
*
Intel 80486SX/SX2
(SL Enhance)
Short
1-2
3-4
Short
2-3
OpenShort
5-6
Short
1-2
Short
1-2
Open
Intel 80486DX/DX2Short
1-2
3-4
Short
1-2
3-4
Short
1-2
Short
5-6
Short
1-2
Short
1-2
Open
Intel 80486DX2
(P24D)
(L1 W/B)
Short
1-2
3-4
Short
1-2
3-4
Short
1-2
Short
3-4
5-6
Short
1-2
4-5
Short
1-2
4-5
Open
Intel 80486DX4**Short
1-2
3-4
Short
1-2
3-4
Short
1-2
Short
5-6
Short
1-2
Short
1-2
Open
UMC Green
CPU U5S-Super
OpenShort
2-3
Short
3-4
Short
1-2
Short
2-3
Short
2-3
Open
Cyrix
CX486DX/DX2 (M7)
Short
2-3
Short
1-2
3-4
Short
1-2
Short
2-3
4-5
Short
1-2
3-4
5-6
Short
1-2
3-4
5-6
Open
Cyrix
CX486S (M6)
Short
2-3
4-5
Short
2-3
OpenShort
2-3
4-5
Short
1-2
3-4
5-6
Short
1-2
3-4
5-6
Open

* JP400 shorts for Am486DX2-80 or Am486DX4-100 internal CLK 2X, JP400 opens for Am486DX4-100 internal CLK 3X

* NOTE: JP100, 101, 102, 300 short for Cyrix DX2-50, if you use other CPU, the JP100, 101, 102, 300 are open.

** Some mother boards support 3.3V (you'll need to contact Advent directly to find out which ones). If the board does support 3.3v then DX4 processors are supported.

Clock Select

ClockJP7JP8JP9
25 MHzShortOpenOpen
33 MHzShortShortShort
40 MHzShortShortOpen
50 MHzOpenOpenShort

Jumpers

JP1 - Flash ROM. If programming a +5v flash ROM then short 1-2. If programming a +12v flash ROM then short 2-3.
JP3 - Keyboard Selection. External = Open, Internal = Short.
JP24 - Intel 80486 DX4 Internal Clock. 3X = Open, 2X = Short 2-3
JP400 - AMD Am486DX4 Internal Clock. 3X = Open, 2X = Short


In the Box

Disks Supplied

  • Microsoft Dos Ver 6.22 (3 disks)
  • Microsoft Dos Ver 6.22 Supplemental Disk (HD)
  • Microsoft Windows Ver 3.11 Disk 1 (7 disks)
  • S3 Utility Driver (HD)
  • Mouse Driver - Test Program (DD)
  • TVGA9000i Driver Ver UD5.5 (HD)

Documentation Supplied

  • UN - 1075 Super I/O Card
  • TVGA 90001 Video Card Operating Instructions
  • UA 4982 Motherboard Manual
  • Advent 4250 Personal Computer
  • MS-DOS & Microsoft Windows for Workgroups Guide

Known Issues

Cannot Access Floppy Drive

In the BIOS there is a section labelled SECURITY. In this there is a section called DISKETTE ACCESS. This is set to SUPERVISOR.

This disables the floppy drive. Change this to USER and the floppy drive should work successfully.


DX/4 Upgrade

The manual says that there are 2 versions of the motherboard and only one supports 3.3V (and the DX/4) and that only the manufacturer can distinguish between them.

The only way to tell if the board is 3.3V is to look for a connector for a voltage regulator module.

There is a connector on the motherboard marked J90, which has about 10 pins. If you move along the side of the board towards the cache, you may come across another similar connector (It should be just past the processor). If it has this then it will support a DX/4. If not, it won't.


How to load the Trident Video Drivers for Windows

In Windows Setup (either from Windows or Dos), choose the "Other" option. When asked to insert disk, place Trident disk in A: and type A:\WIN. Click on Ok. Ensure you have the Windows installation disks handy as they will be asked.