System specs:
Main CPU: Motorola 68000 @ 12.5 MHz
* Same as the Genesis... runs in parallel with it... except the Genny
CPU runs at the slower clock speed 7.9 MHz
Graphics Processor: Custom ASIC
RAM:
* 6 Mbit Main RAM
- Program
- Picture
* 512 Kbit PCM Waveform Memory
- Wavefile memory
* 128 Kbit CD-ROM data cache memory
* 64 Kbit Internal Backup RAM
Colors:
* Originally 64, same as Genesis
* Using programming tricks, can get 128 colors via HAM ("Hold and
Modify")
- Originally developed on the Commodore Amiga to boost color
capabilities
- Basically a graphic over a graphic = a double-color
* Using Cinepak and TruVideo:
- 128 to 256 colors
- Increase screen size from 1/4 to full
- Advanced compression scheme, used in Win 95
- Software-based upgrade
* Eternal Champions CD uses 256 colors simultaneously (only game to
do so)
Storage capability of a Sega CD
* Approximately 500 MB of data (62 min of audio data equivalent)
* 1/4 screen B/W footage video: 1.5 to 4 hours
* 1/4 screen color footage: 45 minutes
* Above specs are prior to compression
Transfer rate of Sega CD: 150 kbytes/sec (Single Speed)
Boot ROM:
* 1 Mbit, contains:
- CD Game Bios
- CD Player Software
- CD+G Software
Bios versions:
* When you start the Sega CD, the title screen displays the Bios
version in the upper-right corner of the screen. This helps
identify what machine version you are using and in a way the
security capabilities. (Startup music and startup screen of the
Sega CD is different for each Bios)
Bios Version Machine
1.00 Original Mega CD
1.10 Original Sega CD, Motorized Drive
2.00 Mega CD2
2.05 Sega CD2
2.10 Sega CD2
CD Access time: 800 ms
Sound Circuitry:
* PCM Sound Source
- Stereo, 8 channels
* 32 KHz Maximum sampling wavelength
* 16 Bit D/A converter
* 8X internal over-sampling digital filter
Audio characteristics:
* Frequency Range: 20Hz - 20 KHz
* Signal-to-Noise Ratio: >900dB@1K
* Channel Separation: >900dB
Output: RCA Pin Jack x2 (L/R)
Dimensions: 301mm (w) x 212.5 (d) x 112.5 (h)
Weight (Sega CD1): 3.1 lbs / 1.4 kg
