MCS9865 is a PCI based Peripheral Controller. It supports dual-channel high performance Serial Ports, dual enhanced IEEE 1284 compliant parallel ports and an ISA style interface. MCS9865 is ideally suited for Desktop PC and Notebook applications, such as PCI / Mini-PCI add-in Cards for high-speed Serial / Parallel Port expansion.
PCI to Multi IO (2S+1P, 2P, ISA) Controller [NOT FOR NEW DESIGN!!]
-- Fully compliant with PCI Local Bus Specification, Revision 2.3
-- Compatible for MiniPCI application requirements
-- Fully customizable PCI Configuration Space
-- Compatible with 3.3V and 5V PCI signaling
-- Supports PCI Power Management
● Serial Port
-- Four 16C 450 / 550 / Extended 550 compatible UARTs
-- Supports RS232, RS485 & RS422 modes
-- Bi-directional Speeds from 50 bps to 16 Mbps / Port
-- Full Serial modem control
-- Supports Hardware, Software flow control
-- 5, 6, 7, 8, 9-bit Serial format support
-- Even, Odd, None, Space & Mark parity supported
-- Custom BAUD rate support with external clock / by programming internal PLL
-- On Chip deep 256 Byte FIFOs in Transmit & Receive paths of each Serial Port
-- Supports remote wakeup and power management features
-- Serial Port transceiver shutdown support
-- Supports Slow IrDA on all Serial Ports
● IEEE1284 Parallel Port
-- Multi-mode IEEE1284 compliant controller (SPP, PS2, EPP, ECP)
-- Faster data rates up to 1.5Mbytes/sec for parallel port
-- ISA style I/O interface for extending UARTs & Parallel Ports
-- 8 bit data bus @ 8MHz
-- On-Chip Dual Voltage Regulator (5V to 3.3V & 1.8V)
-- Two-Wire I2C Interface for EEPROM
-- EEPROM read / write through PCI
-- Four bi-directional multi-function GPIO lines
-- On chip oscillator
-- Package : 128-Pin LQFP, RoHS
-- Operating Temperature : -40 to +85°C
Serial Attached Devices
Serial Networking / Monitoring Equipment
Data Acquisition System
POS Terminal & Industrial PC
Parallel / Printer Port based applications
Add-On I/O Cards-Serial / Parallel
Embedded systems-For I/O expansion
Hardware Design Considerations
Where can I obtain the latest MCS9865 datasheet, reference schematic and other hardware design archives?
Please register MyASIX membership and then download the latest MCS9865 datasheet, reference schematic, PCB layout guide, etc. from MCS9865 Product web page directly.
Can ASIX help me to review my own MCS9865 schematic and PCB layout?
Yes, please deliver your own MCS9865 schematic and PCB layout files to ASIX's Support (firstname.lastname@example.org) for further review before making your own MCS9865 PCB board.
How do I register a PCI Vendor ID from PCI-SIG?
If you are a new PCI/PCIe product developer looking to get a PCI Vendor ID for your company, you can register a PCI Vendor ID from PCI-SIG (Peripheral Component Interconnect Special Interest Group). Please visit the PCI-SIG web site for details.
What is the PCI clock frequency for MCS9865?
The supported PCI clock frequency for MCS9865 is 33 MHz; all the devices on the same PCI bus will be forced to 33 MHz.
Does the MCS9865 EEPROM utility program the I2C EEPROM while it is in-circuit or does it need to be pre-programmed and then placed on the PCB?
The utility can program the I2C EEPROM while it is in-circuit. There is no need to pre-program it and then place it on the PCB.
What should be the maximum length of RS232 serial cable that can be used for MCS9865?
Cable length is one of the most discussed items in RS232 world. The standard has a clear answer; the maximum serial cable length is 50 feet, or the cable length equal to a capacitance of 2500 pF.
Software Design Considerations
Where can I obtain the latest MCS9865 drivers?
Please visit MCS9865 Driver Download web page to download proper drivers for your MCS9865 target applications.
Is it possible to manually change the IRQ of MCS9865 Parallel/Serial ports?
It is not possible to manually change IRQ setting of all PCI devices in any operating systems because the IRQ used by the device is assigned by the PCI system and cannot be changed. Usually the only way to change the IRQ of a PCI device is to move it to a different PCI slot. Each slot is usually assigned a different IRQ, although this is not always true. Each system may handle the assignment of IRQs differently.
Is it possible to remap the I/O addresses of MCS9865 Parallel/Serial ports to Legacy I/O address values?
In order to be compatible with some legacy software, some users might need to remap the assigned I/O addresses of MCS9865 Parallel/Serial ports to Legacy (ISA type) I/O address (such as 378h, 3F8h, etc.). It is possible on DOS and Windows 95/98/ME operating systems but impossible on Windows NT/2000/XP/Vista/7/8 operating systems because the Remap I/O Address feature is only supported on DOS and Windows 95/98/ME operating systems but is not supported on Windows NT/2000/XP/Vista/7/8 operating systems. As the newer Windows systems maintain a much tighter control over the I/O devices and prevent any Re-Mapping I/O Address operation at device driver level. When the Re-Mapping I/O Address is not permitted, the device must use the I/O Addresses assigned by the PCI system at Boot-Up. If the software application expects the Parallel/Serial ports to use Legacy I/O address resources, it will not be possible to make it work with the Parallel/Serial ports of PCI based devices on Windows NT/2000/XP/Vista/7/8 platforms.
On DOS platform, MCS9865 can remap the I/O addresses of the Parallel/Serial ports to desired values by running MCS9865 DOS utility. However, on Windows 95/98/ME platforms, you can only remap the I/O addresses of the Serial ports (but not Parallel port).
Can I manually force MCS9865 parallel port at a specific LPT mode (such as EPP, ECP, etc.)?
Only the MCS9865 DOS and Windows NT drivers have a mechanism to manually select the desired LPT Mode for MCS9865 Parallel port. The Windows systems are supposed to be able to auto-switch to a proper LPT mode for PCI based parallel port devices. Unfortunately, this LPT mode automatic switching functionality does not work very well with PCI based Parallel port devices on Windows systems.
MCS9865 can support SPP and PS/2 Modes without any problems. The EPP and ECP modes supporting varies from machine to machine and depends on the Operating System being used. Both EPP and ECP modes require two banks of Standard/Extended registers to control the standard/enhanced functionality of MCS9865 Parallel port. The base address of 2nd bank Extended registers must be equal to "the base address of 1st bank Standard registers + 400h" to meet the IEEE-1284 standard specification.
Unfortunately, the PCI specification does not make any guarantees that two resource requests will have any specific relationship to each other. We request the two banks with the desired offset, but the system does not always honor those requests, and often returns the extended register bank at some entirely different address than what we requested. When this occurs, neither EPP nor ECP Mode will be workable. For this reason, some software (including Device Drivers for Printers etc.) will not work with MCS9865 PCI based Parallel port.
Is it possible to change the COM port number of MCS9865?
Yes, the COM port number of MCS9865 can be changed to a desired number that is free and un-used by device/serial application. If you are using Windows systems, there is a control which will let you change the COM port number easily. 1. Go into the Device Manager. 2. Open the Properties page for the Port in question (under Ports COM & LPT). 3. In the "Port Settings" tab, click the "Advanced" button. On the screen that opens is the control to change the COM port number.
Is it possible to change the LPT port number of MCS9865?
Yes, we can change the LPT port number by using a drop down list located in LPT Port Properties. To change the LPT port number, go to "LPT Port Properties => Port Setting => LPT Port Number". If there is no standard LPT port available on motherboard, MCS9865 LPT port will automatically enumerate as LPT1, otherwise it will enumerate as LPT3.
Does MCS9865 support Serial mouse under DOS?
In DOS operating system, the serial mouse driver expects the standard IRQ to be present for serial port. The IRQ of MCS9865 serial ports, which is different from the standard serial port, is assigned by system BIOS and cannot be changed. Therefore, the serial mouse support is not possible under DOS for MCS9865.
Hardware Design Documentation
MCS9865 PCI 2 Serial + 1 Parallel Reference Schematic
MCS9865 PCI 2 Serial + 2 Parallel Reference Schematic
MCS9865 PCI 4 Serial + 1 Parallel Reference Schematic
Software & Tools
Linux kernel 5.x/4.x/3.x/2.6.x DriverFor all Android systems, Linux kernel 2.6.14 and later
Windows 10/8.x/7/Vista/XP 32-bit DriverFor x86 CPU platform, WHCK certified
Windows 10/8.x/7/Vista/XP 64-bit DriverFor x64 CPU platform, WHCK certified
Windows CE 5.0 / Mobile 5 / Mobile 6 DriverFor CEPC x86 platform
PCIe/PCI/USB to serial/parallel bridge solutions for industrial computers and embedded systems
UART Transceivers/EL Drivers
5V/3V RS-232/RS-422/RS-485 UART transceivers solutions for industrial computers, embedded systems; EL drivers solutions for PDAs, cell phones and other handheld/portable devices.