CD-ROM System: Difference between revisions

Revision as of 01:40, 23 October 2026 RemmyLee (CONTEXT.md: route images and backups)	Revision as of 02:22, 23 October 2026 RemmyLee (Hardware and system software pages from the Sony manuals)
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	+	---
	+	title: CD-ROM System
	+	type: component
	+	summary: Drive and decoder that read CD-DA, CD-ROM XA and PlayStation discs.
	+	category: Hardware
	+	---
	+
	+	## Overview
	+
	+	The CD-ROM system is made up of the drive, the decoder and the other parts needed to read a CD-ROM.[^hw15]
	+
	+	It supports CD-DA, CD-ROM XA and PlayStation disc formats.[^hw15]
	+
	+	## CD-ROM Decoder
	+
	+	The CD-ROM decoder reads data from a compact disc. It plays the data as sound or transfers it to main memory.[^hw43]
	+
	+	Data from the drive goes into the CD-ROM buffer. The sound source in the decoder processes it after error correction.[^hw43]
	+
	+	The decoder plays CD-DA 16-bit PCM data and the ADPCM data defined by CD-ROM XA.[^hw43]
	+
	+	The audio signal goes to the [SPU](/hardware/spu/) through a mixer built into the decoder.[^hw43]
	+
	+	## Mixer
	+
	+	The built-in mixer has 4 attenuators. The attenuation of each attenuator sets the mix of the stereo output.[^hw43]
	+
	+	In the SPU the decoder output is mixed with the SPU output. It then passes through the reverb unit to the audio output.[^hw43]
	+
	+	## References
	+
	+	[^hw15]: Sony Computer Entertainment Inc. PlayStation Hardware. August 1998. Page 1-5.
	+	[^hw43]: Sony Computer Entertainment Inc. PlayStation Hardware. August 1998. Page 4-3, Figure 4-1, Figure 4-2.