# Serial Adapter Card StarTech 2-port ISA RS232 with 16550 UART, ISA interface, up to 460.9 Kbit/s

**URL:** https://aio.lv/en/product--startech-isa2s550--639289
**Data updated:** 2026-03-07 10:54 (EET)
**Category:** Network Cables
**Manufacturer:** StarTech
**Manufacturer code:** ISA2S550
**EAN:** 0065030875028
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 88.49 €
**Prices and availability valid until:** 2026-07-15 23:59
**Price without VAT (21%):** 73.13 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--startech-isa2s550--639289

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 07.07.2026 | free |
| Pickup points | 10.07.2026 | 1.99 EUR |
| Courier delivery to door | 10.07.2026 | 4.99 EUR |

## Summary description

2-port ISA RS232 serial adapter card from StarTech featuring 16550 UART for buffered serial communications. Uses an ISA host interface and supports data rates of 115.2 Kbit/s, 230.4 Kbit/s and up to 460.9 Kbit/s (0.4608 Mbit/s). Physical package dimensions: width 24 mm, depth 152 mm, height 140 mm. Compatible with legacy Windows versions (Windows 3.1, 95, 98, NT4, NT5). Suited for adding serial COM ports to older PCs, industrial equipment, and embedded systems that require RS232 connections.

## Long description

The StarTech 2-port ISA RS232 serial adapter card with 16550 UART provides two buffered RS232 COM ports through a standard ISA host interface. Designed for older motherboards and legacy systems, this expansion card enables serial communication at configured baud rates up to 460.9 Kbit/s (460.8 Kbit/s nominal) and supports common rates such as 115.2 Kbit/s and 230.4 Kbit/s. The card is supplied with jumpers for IRQ and port configuration and includes drivers for DOS, Windows and Linux, making it suitable for restoring or expanding serial connectivity on vintage PCs, industrial controllers and embedded platforms.
Advantages
This ISA serial adapter offers buffered serial communications via 16550 UARTs to reduce CPU overhead and support high-speed serial devices. The built-in jumper set enables manual configuration of IRQs and I/O addresses for compatibility with a wide range of legacy systems. With support for established serial baud rates and driver availability across DOS, Windows and Linux, the card simplifies adding two RS232 ports to systems that lack modern expansion options. Its compact physical dimensions make it appropriate for cramped chassis and older form factors.
Подходит для
Adding two RS232 COM ports to ISA-equipped desktop PCs and servers
Connecting serial peripherals such as modems, printers, POS terminals and ISDN adapters
Industrial and embedded systems that require reliable serial links
Restoring connectivity on vintage computers and legacy equipment
Key specifications
Interface: ISA host slot
Serial standard: RS232
UART type: 16550 (buffered)
Ports: 2 RS232 COM ports
Data rates: supports 115.2 Kbit/s, 230.4 Kbit/s and up to 460.9 Kbit/s (460.8 Kbit/s nominal)
Driver support: DOS, Windows (legacy versions), Linux
Physical dimensions (approx.): width 24 mm, depth 152 mm, height 140 mm
On-board configuration: jumper-set for IRQ and I/O address selection
How to use
Power down the system and unplug it from mains before installation. Insert the card into an available ISA slot on the motherboard and secure it to the chassis. Configure the on-board jumpers to select appropriate IRQ and I/O address settings that do not conflict with other devices. Reconnect power and boot the system. Install the supplied or compatible drivers for your operating system (DOS, Windows or Linux) if automatic recognition does not occur. After driver installation, verify COM port assignments in the operating system and test communication with the attached serial device at the desired baud rate.
Usage recommendations
For reliable operation, choose IRQ and I/O address settings that avoid conflicts with existing devices. Use shielded RS232 cables for noisy industrial environments and verify device baud rate and handshake settings to match the card’s UART configuration. Because this is an ISA-based solution, ensure physical compatibility with the system chassis and confirm operating system support for legacy drivers before deployment.

## Specifications

| Feature | Value |
|---|---|
| Supported data transfer rates | x1 115.2 Kbits/sec., x2 230.4 Kbits/sec., x4 460.9 Kbits/sec |
| Host interface | ISA |

### Features

| Feature | Value |
|---|---|
| Data transfer rate | 0.4608 Mbit/s |

### Other features

| Feature | Value |
|---|---|
| I/O ports | 2 - DB9 Male |
| Ports quantity | 2 |
| Compatible operating systems | Windows 3.1, 95, 98, NT4, NT5 Plus |

### Packaging data

| Feature | Value |
|---|---|
| Package weight | 130 g |
| Package depth | 152 mm |
| Package height | 140 mm |
| Package width | 24 mm |

## FAQ

### How much does the StarTech 2-port ISA RS232 Serial Adapter (16550 UART) cost, and is it available for purchase?

The price is 88.49 € (valid at the time of publication and already includes all taxes). The item is available for order — 11 pcs. are in stock, and you can place your purchase right now with delivery across Latvia and Europe or choose pickup at the Riga collection point. We offer favorable purchase terms, including the option to split the payment into convenient monthly installments. Availability and price are updated in real time, so we recommend placing your order in advance.

### If I order this product today, when will I receive my order?

If you place your order today, delivery will be as fast and convenient as possible. You will be able to pick up your order on 07.07.2026 at the Riga pickup point or choose delivery across Latvia and Europe. We carefully inspect every purchase and pack it securely for safe transportation.

### What payment options are available?

AiO.lv offers several payment methods: Bank transfer, Bank cards on-line, Apple Pay, Google Pay, Installment. All transactions are 100% secure and encrypted.

### Can StarTech 2-port ISA RS232 Serial Adapter (16550 UART) be purchased with a lease?

Yes, the purchase is available both on credit and with an interest-free installment plan. Learn more about installments and credit options: https://aio.lv/en/payment#b3

### Can this product be purchased for a company (with VAT)?

Yes. AiO.lv works with legal entities in Latvia and across Europe. The product price already includes VAT. For certain product categories, as well as for companies from other EU countries with a valid VAT number, a 0% VAT rate may apply. We issue the invoice immediately after the order is placed, support electronic BIS invoices, and automatically generate all necessary accounting documents. You can complete the purchase for a company online — simply select the company profile and choose bank transfer as the payment method during checkout.

### What is the warranty period?

All StarTech products come with an official 2 Years warranty. It covers all manufacturing defects and malfunctions that may occur during use. The warranty is valid at all authorized StarTech service centers and through AiO.lv

### Can the product be returned after purchase?

Yes, you can return the product within 14 days of purchase if you bought it as a consumer (not a legal entity). Returns are possible without giving any reason — the main condition is that the product retains its original appearance and full set of accessories. We will make the process as simple and convenient as possible: just contact our customer support team, and we will help you arrange the return.

### Where should I contact for warranty service?

For warranty-related questions you can contact the AiO.lv (SIA VSPRO) customer support team. More information about warranty service: https://aio.lv/en/warranty

## Image

https://aio.lv/img/cache/product/639289/57494213_large.webp