 Acer File Extensions |
Advent 4250 PC
| CPU | Cyrix Cx486DX2 50Mhz in a socket 3 ZIF socket |
| Motherboard | UA 4982 |
| BIOS | Phoenix Bios Version 4.03. Dated 08/02/94 |
| Memory | 4MB RAM expandable to 64MB using 4 x 72 pin SIMMS |
| Cache | 8kb internal cache 0Kb external, upgradeable options to 128Kb / 512Kb |
| Hard Drive | 170MB |
| CD Drive | Not Fitted |
| Video Card | TVGA 9000i - 512KB |
| Sound Card | Not Fitted |
| Keyboard | 102 New enhanced PS/2 Compatible Keyboard |
| Mouse | 3 Button PS/2 Style |
| Interfaces | 1x 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 |
| Expansion | 3 Vesa slots, 4 16 bit - AT compatible expansion slots |
Motherboard Information
Cache
| Option | Tag RAM U22 | Cache Bank 0 U12,U13,U14,U15 |
|---|---|---|
| 128K | 32x8 | 32x8 |
| 256K | 32x8 | 64x8 |
| 512K | 32x8 | 128x8 |
| Cache | JP4 | JP5 | JP6 | JP10 | JP11 | JP12 | JP13 |
|---|---|---|---|---|---|---|---|
| 128K (32Kx8) | Short 1-2 | Short 1-2 | Open | Open | Open | Open | Open |
| 256K (64Kx8) | Short 1-2 | Short 1-2 | Short 1-2 | Open | Open | Open | Open |
| 512K (128Kx8) | Short 1-2 | Short 2-3 | Short 2-3 | Short 1-2 | Short | Open | Short |
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 Type | JP14 | JP15 | JP16 | JP17 | JP18 | JP19 | JP400 |
|---|---|---|---|---|---|---|---|
| Intel 80486SX/SX2 | Open | Short 2-3 | Open | Open | Short 2-3 | Open | Open |
| Intel 80486DX/DX2 AMD Am486DX/DX2/DX4** | Open | Short 1-2 3-4 | Short 1-2 | Open | Short 2-3 | Open | Open * |
| Intel 80486SX/SX2 (SL Enhance) | Short 1-2 3-4 | Short 2-3 | Open | Short 5-6 | Short 1-2 | Short 1-2 | Open |
| Intel 80486DX/DX2 | Short 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 | Open | Short 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 | Open | Short 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
| Clock | JP7 | JP8 | JP9 |
|---|---|---|---|
| 25 MHz | Short | Open | Open |
| 33 MHz | Short | Short | Short |
| 40 MHz | Short | Short | Open |
| 50 MHz | Open | Open | Short |
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.