Description
Emerald Technology 3XTWIN 9055811 8-Bit ISA Serial Controller Card Rev E1 1991
The Emerald Technology 3XTWIN is an 8-bit ISA serial controller expansion card designed to add multi-serial port connectivity to ISA-bus personal computers. Part number 9055811, hardware revision E1, it carries a 15-pin male DB15 connector on the bracket for external serial device connections and installs in any standard 8-bit ISA slot. The PCB silkscreen dates manufacture to 1991.
Specifications & What's Included
- Manufacturer: Emerald Technology Inc.
- Model: 3XTWIN
- Part Number: 9055811
- Hardware Revision: Rev E1
- ROM/Monitor Version: MON VER E.01
- Bus Interface: 8-bit ISA
- Bracket Connector: 15-pin male DB15
- Main Serial Controller IC: COM52C50 (SMC, date code D9251)
- SRAM ICs: KM62648L-10 (Samsung, 315Y Korea) × 2 visible; KM62256BLP-10 (Samsung, 302C Korea)
- Logic ICs: SN74LS244N, SN74LS374N (Texas Instruments TTL)
- FCC Classification: Class A — see manual
- Year of Manufacture: 1991
- Card only — no drivers, software, or documentation included
Applications
The Emerald Technology 3XTWIN belongs to a family of multi-serial ISA cards produced in the late 1980s and early 1990s for IBM PC/XT and AT-compatible computers needing additional RS-232 serial ports beyond the one or two built into the motherboard. Cards of this type were used to connect terminals, modems, serial printers, plotters, barcode readers, and other serial peripherals in office, industrial, and data-acquisition environments. The COM52C50 serial controller IC is a UART-compatible device used to manage serial data framing and buffering. The 3XTWIN's 15-pin DB15 connector typically broke out to multiple individual DB9 or DB25 serial ports via a fan-out cable. These cards are now sought primarily by collectors of vintage IBM-compatible hardware and by integrators maintaining legacy systems that still require ISA-bus serial expansion.
This Emerald Technology 3XTWIN ISA serial controller card (P/N 9055811, Rev E1) is in good used condition. The PCB is clean and free of visible damage, with no broken traces, burn marks, or corrosion. The 15-pin male DB15 bracket connector and ISA edge fingers are intact and show normal handling wear. The metal bracket has light surface scratches consistent with typical used equipment. The card has not been powered up or tested at our facility, but it was pulled from a working environment where it was previously in use. Please view our photo set and contact us if you have any questions.
Warranty Information
Additional Information
Brand: |
Emerald Technology |
Model: |
3XTWIN |
MPN: |
9055811 |
SKU: |
44753 |
Type: |
8-Bit ISA Serial Controller Card |
Revision: |
Rev E1 |
ROM Version: |
MON VER E.01 |
Bus Interface: |
ISA 8-Bit |
Connector Type: |
15-Pin Male DB15 |
Main Controller Chip: |
COM52C50 (SMC D9251) |
Memory ICs: |
KM62648L-10, KM62256BLP-10 (Samsung SRAM) |
Year Manufactured: |
1991 |
Country/Region of Manufacture: |
Mexico / Korea (PCB components) |
Form Factor: |
Half-Length ISA Card |
FCC Class: |
Class A |
Seller Notes: |
Card only; no software or documentation included. |
Condition Notes: |
This Emerald Technology 3XTWIN ISA serial controller card (P/N 9055811, Rev E1) is in good used condition. PCB is clean, DB15 and ISA edge connector are intact. Not tested at our facility; pulled from a working environment. |
California Prop 65 Warning: |
WARNING: This product can expose you to chemicals including lead and lead compounds, and DEHP (a phthalate), which are known to the State of California to cause cancer and birth defects or other reproductive harm. Go to P65Warnings.ca.gov |