Multimedia PC :
The Multimedia PC (MPC) was a recommended configuration for a personal
computer (PC) with a CD-ROM drive. The standard was set and named by the
"Multimedia PC Marketing Council", which was a working group of the
Software Publishers Association (SPA, now the Software and Information
Industry Association).
The specification of MPC - 1 and MPC - 2 :
Specification of MPC-1:
); MSCDEX 2.2 driver that implements the extended audio APIs; subchannel Q
The drive must be capable of maintaining a sustained transfer rate of 150kB/sec. without consuming more than 40 percent of the CPU bandwidth in the process. It is recommended that this capability be achieved for read block sizes no less than 16K and lead time of no more than is required to load the CD-ROM buffer with 1 read block of data.
It is recommended that the drive have on-board buffers of 64K and implement read-ahead buffering.
) outputs and a front panel volume control.
44.1 kHz sampling rate desirable; optional stereo channels; no more than 10 percent of the CPU bandwidth required to output 11.025 or 22.05 kHz; no more than 15 percent for 44.1 kHz.
,
synthesizer, DAC (waveform), and (recommended but not required) an
auxiliary input source. Each input must have at least a 3-bit volume
control (eight steps) with a logarithmic taper.
A 4-bit or greater volume control is strongly recommended. If all sources are sourced with -10dB (consumer line level: 1 milliwatt into 700 ohms=0dB) without attenuation, the mixer will not clip and will output between 0 dB and +3 dB. Individual audio source and master digital volume control registers and extra line-level audio sources are highly recommended.
. An enhanced configuration referred to as VGA+ is recommended with 640 x 480, 256 colors.
The recommended performance goal for VGA+ adapters is to be able to blit 1, 4, and 8 bit-per-pixel DIBs (device independent bitmaps) at 350K pixels/second given 100 percent of the CPU, and at 140K pixels/second given 40 percent of the CPU. This recommendation applies to run-length encoded images and non-encoded images. The recommended performance is needed to fully support high-performance applications, such as synchronized audio-visual presentations.
Multimedia PC system software must offer binary compatibility with Microsoft Windows 3.0 with Multimedia Extensions or Windows 3.1.
Specification of MPC-2:
At 300 KB/sec. sustained transfer rate it is recommended that no more than 60 percent of the CPU bandwidth be consumed. It is recommended that the CPU utilization recommendation be achieved for read block sizes no less than 16K and lead time of no more than is required to load the CD-ROM buffer with 1 read block of data.
CD-ROM XA audio capability is recommended.
Support for the IMA adopted ADPCM software algorithm is recommended.
CPU
Minimum requirement: 386SX (or compatible) microprocessorRAMMinimum requirement: 2 megabytes of RAMMagnetic StorageRequirement:
3.5-inch, high density (1.44-MB) floppy disk drive.Minimum requirement: 30-MB hard disk drive.Optical Storage
Requirement:
CD-ROM drive with sustained 150kB/second
transfer rate; average seek time of 1 second or less; 10,000 hours MTBF;
mode 1 capability (mode 2 and form 1 & 2 optional); MSCDEX 2.2 driver that implements the extended audio APIs; subchannel Q The drive must be capable of maintaining a sustained transfer rate of 150kB/sec. without consuming more than 40 percent of the CPU bandwidth in the process. It is recommended that this capability be achieved for read block sizes no less than 16K and lead time of no more than is required to load the CD-ROM buffer with 1 read block of data.
It is recommended that the drive have on-board buffers of 64K and implement read-ahead buffering.
AudioRequirement:
CD-ROM drive with CD-DA (Red Book) outputs and a front panel volume control.Requirement: 8-bit (16-bit recommended) digital-to-analog
converter (DAC) with linear PCM sampling; DMA or FIFO buffered transfer
capability with interrupt on buffer empty; 22.05 and 11.025 kHz sample
rate mandatory.44.1 kHz sampling rate desirable; optional stereo channels; no more than 10 percent of the CPU bandwidth required to output 11.025 or 22.05 kHz; no more than 15 percent for 44.1 kHz.
Requirement: 8-bit (16-bit recommended) analog-to-digital
converter (ADC) with linear PCM sampling, 11.025 kHz mandatory, (22.01
kHz, or 44.1 kHz sampling rate optional); DMA or FIFO buffered transfer
capability with interrupt on buffer full; microphone input.Requirement: Internal synthesizer hardware with
multi-voice, multi-timbral capabilities, six simultaneous melody notes
plus two simultaneous percussive notes.Requirement: Internal mixing capabilities to combine input
from three (recommended four) sources and present the output as a
stereo, line-level audio signal at the back panel. The four sources are:
CD Red Book,
synthesizer, DAC (waveform), and (recommended but not required) an
auxiliary input source. Each input must have at least a 3-bit volume
control (eight steps) with a logarithmic taper.A 4-bit or greater volume control is strongly recommended. If all sources are sourced with -10dB (consumer line level: 1 milliwatt into 700 ohms=0dB) without attenuation, the mixer will not clip and will output between 0 dB and +3 dB. Individual audio source and master digital volume control registers and extra line-level audio sources are highly recommended.
VideoRequirement:
VGA-compatible display adapter, and a color VGA- compatible monitor. A basic Multimedia PC uses mode 12h (640 x 480, 16 colors). An enhanced configuration referred to as VGA+ is recommended with 640 x 480, 256 colors.
The recommended performance goal for VGA+ adapters is to be able to blit 1, 4, and 8 bit-per-pixel DIBs (device independent bitmaps) at 350K pixels/second given 100 percent of the CPU, and at 140K pixels/second given 40 percent of the CPU. This recommendation applies to run-length encoded images and non-encoded images. The recommended performance is needed to fully support high-performance applications, such as synchronized audio-visual presentations.
User Input.Requirement:
Standard 101-key IBM-style keyboard with
standard DIN connector, or keyboard that delivers identical
functionality utilizing key-combinations.Requirement: Two-button mouse with bus or serial connector, with at least one additional communication port remaining free.I/ORequirement:
Standard 9-pin or 25-pin asynchronous serial port, programmable up to 9600 bits per second (BPS), switchable interrupt channel.Requirement: Standard 25-pin bidirectional parallel port with interrupt capability.Requirement: 1 MIDI port with In, Out, and Thru must have interrupt support for input and FIFO transfer.Requirement: IBM-style analog or digital joystick port.System SoftwareMultimedia PC system software must offer binary compatibility with Microsoft Windows 3.0 with Multimedia Extensions or Windows 3.1.
Specification of MPC-2:
CPUMinimum requirement: 25 MHz 486SX (or compatible) microprocessor.RAMMinimum requirement:
4 megabytes of RAM (8 megabytes recommended).Magnetic StorageRequirement: 160-MB or larger hard disk drive.Optical StorageRequirements:
CD-ROM drive capable of sustained 300 KB/sec.
transfer rate, average seek time of 400 milliseconds or less, CD-ROM XA
ready (mode 1 capable, mode 2 form 1 capable, mode 2 form 2 capable),
multisession capable.At 300 KB/sec. sustained transfer rate it is recommended that no more than 60 percent of the CPU bandwidth be consumed. It is recommended that the CPU utilization recommendation be achieved for read block sizes no less than 16K and lead time of no more than is required to load the CD-ROM buffer with 1 read block of data.
AudioRequirement:
16-bit digital-to-analog converter (DAC), 44.1
kHz sample rate mandatory, stereo channels; no more than 15 percent of
the CPU bandwidth be required to output 44.1 kHz.Requirement: 16-bit analog-to-digital converter (ADC) with Linear PCM sampling; 44.1 kHz sample rate mandatory.CD-ROM XA audio capability is recommended.
Support for the IMA adopted ADPCM software algorithm is recommended.
VideoRequirement:
Color monitor with display resolution of 640 x
480 with 65,536 (64K) colors. The recommended performance goal for VGA+
adapters is to be able to blit 1, 4, and 8 bit-per-pixel DIBs (device
independent bitmaps) at 1.2 megapixels/second given 40 percent of the
CPU. This recommendation applies to run-length encoded images and
non-encoded images. The recommended performance is needed to fully
support demanding multimedia applications including the delivery of
video with 320 x 240 resolution at 16 frames/second and 256 colors.User Input :No changes from Level 1.
I/O :No changes from Level 1.
System Software :No changes from Level 1.
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