DIGITAL EQUIPMENT CORPORATION
PRIORIS XL
Device Type | Mainboard |
Processor | 80486DX/80486DX2/Pentium |
Processor Speed | 25/33/50(internal)/66(internal)MHz |
Chip Set | Unidentified |
Video Chip Set | Unidentified |
Maximum Onboard Memory | 128MB (80486)/512MB (Pentium) |
Maximum Video Memory | 1MB |
Cache | 128/256KB |
BIOS | Unidentified |
Dimensions | 305mm x 244mm |
I/O Options | 32-bit PCI slots (3), floppy drive interface, IDE interface, SCSI interface, Wide Ultra SCSI interface, parallel port, PS/2 mouse port, serial ports (2), VGA feature connector, VGA port, CPU slot |
NPU Options | None |

CONNECTIONS | |||
Purpose | Location | Purpose | Location |
Parallel port | CN1 | IDE interface | CN9 |
VGA port | CN2 | VGA feature connector | CN10 |
Serial port | CN3 | 5v auxiliary power | P1 |
Serial port | CN4 | 5v power | P2 |
PS/2 mouse port | CN5 | 3.3v power | P3 |
Ultra Wide SCSI interface | CN6 | 32-bit PCI slots | PC1 – PC3 |
SCSI interface | CN7 | CPU slot | SL1 |
Floppy drive interface | CN8 | ||
USER CONFIGURABLE SETTINGS | |||
Function | Label | Position | |
» | VGA IRQ9 disabled | J9 | Open |
VGA IRQ9 enabled | J9 | Closed | |
» | On board I/O enabled | J17 | Closed |
On board I/O disabled | J17 | Open | |
» | Wide SCSI disabled | J22 | Open |
Wide SCSI enabled | J22 | Closed | |
» | Monitor type select color | J37 | Closed |
Monitor type select monochrome | J37 | Open | |
» | Password normal operation | J38 | Open |
Password clear | J38 | Closed | |
» | BIOS normal operation | J39 | Open |
BIOS recovery mode | J39 | Closed | |
» | BIOS upgrade enabled | J41 | Closed |
BIOS upgrade disabled | J41 | Open | |
» | Boot block enabled | J50 | Pins 1 & 2 closed |
Boot block disabled | J50 | Pins 2 & 3 closed | |
SIMM CONFIGURATION | ||||
Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
8MB | (2) 1M x 36 | None | None | None |
16MB | (2) 2M x 36 | None | None | None |
16MB | (2) 1M x 36 | (2) 1M x 36 | None | None |
24MB | (2) 2M x 36 | (2) 1M x 36 | None | None |
24MB | (2) 1M x 36 | (2) 1M x 36 | (2) 1M x 36 | None |
32MB | (2) 4M x 36 | None | None | None |
32MB | (2) 2M x 36 | (2) 2M x 36 | None | None |
SIMM CONFIGURATION (CON’T) | ||||
Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
32MB | (2) 1M x 36 | (2) 1M x 36 | (2) 1M x 36 | (2) 1M x 36 |
40MB | (2) 4M x 36 | (2) 1M x 36 | None | None |
48MB | (2) 4M x 36 | (2) 2M x 36 | None | None |
48MB | (2) 2M x 36 | (2) 2M x 36 | (2) 2M x 36 | None |
64MB | (2) 2M x 36 | (2) 2M x 36 | (2) 2M x 36 | (2) 2M x 36 |
64MB | (2) 8M x 36 | None | None | None |
64MB | (2) 4M x 36 | (2) 4M x 36 | None | None |
72MB | (2) 8M x 36 | (2) 1M x 36 | None | None |
80MB | (2) 8M x 36 | (2) 2M x 36 | None | None |
96MB | (2) 8M x 36 | (2) 4M x 36 | None | None |
96MB | (2) 4M x 36 | (2) 4M x 36 | (2) 4M x 36 | None |
128MB | (2) 16M x 36 | None | None | None |
128MB | (2) 8M x 36 | (2) 8M x 36 | None | None |
128MB | (2) 4M x 36 | (2) 4M x 36 | (2) 4M x 36 | (2) 4M x 36 |
136MB | (2) 16M x 36 | (2) 1M x 36 | None | None |
144MB | (2) 16M x 36 | (2) 2M x 36 | None | None |
152MB | (2) 16M x 36 | (2) 1M x 36 | (2) 1M x 36 | (2) 1M x 36 |
160MB | (2) 16M x 36 | (2) 4M x 36 | None | None |
176MB | (2) 16M x 36 | (2) 2M x 36 | (2) 2M x 36 | (2) 2M x 36 |
192MB | (2) 16M x 36 | (2) 8M x 36 | None | None |
192MB | (2) 8M x 36 | (2) 8M x 36 | (2) 8M x 36 | None |
224MB | (2) 16M x 36 | (2) 4M x 36 | (2) 4M x 36 | (2) 4M x 36 |
256MB | (2) 16M x 36 | (2) 16M x 36 | None | None |
256MB | (2) 8M x 36 | (2) 8M x 36 | (2) 8M x 36 | (2) 8M x 36 |
272MB | (2) 16M x 36 | (2) 16M x 36 | (2) 1M x 36 | (2) 1M x 36 |
288MB | (2) 16M x 36 | (2) 16M x 36 | (2) 2M x 36 | (2) 2M x 36 |
320MB | (2) 16M x 36 | (2) 16M x 36 | (2) 4M x 36 | (2) 4M x 36 |
320MB | (2) 16M x 36 | (2) 8M x 36 | (2) 8M x 36 | (2) 8M x 36 |
384MB | (2) 16M x 36 | (2) 16M x 36 | (2) 16M x 36 | None |
512MB | (2) 16M x 36 | (2) 16M x 36 | (2) 16M x 36 | (2) 16M x 36 |
Note: If 80486 module is installed, it will accept up to 128MB. | ||||
VIDEO MEMORY CONFIGURATION |
Note: the size of the video memory is unidentified. |
CPU TYPE SELECTION | |
Type | J27 |
Intel | Open |
All other types | Closed |
CPU CARD SELECTION | ||
Type | J24 | J25 |
Single CPU installed | Pins 1 & 2 closed | Pins 1 & 2 closed |
Multiple CPUs installed | Pins 2 & 3 closed | Pins 2 & 3 closed |

CACHE CONFIGURATION | |
Size | Bank 0 |
128KB | (4) 32K x 8 |
256KB | (4) 64K x 8 |
CACHE JUMPER CONFIGURATION | |||
Size | J8 | J9 | J10 |
128KB | Pins 1 & 2 closed | Pins 1 & 2 closed | Pins 1 & 2 closed |
256KB | Pins 2 & 3 closed | Pins 2 & 3 closed | Pins 2 & 3 closed |
CPU SPEED SELECTION | |
Speed | J12 |
25MHz | Pins 1 & 2 closed |
33MHz | Pins 2 & 3 closed |
50iMHz | Pins 1 & 2 closed |
66iMHz | Pins 2 & 3 closed |