CDTV SERVICE MANUAL
1.1 SPECIFIC ATIONS
CENTRAL PROCESSING UNIT
MC68000 (Motorola) 16/32 bit main CPU
CPU SPEED
7.15909 MHz (NTSC); 7.09379 MHz (PAL)
NOTE: CPU speeds can vary when using an external System clock such as with genlocking units.
CUSTOM CHIPS
3 Amiga-specific custom chips (Agnus, Paula and Denise) which enhance System performance by taking over tasks
such as handling video, sound, direct memory access (DMA) and/or graphics.
OTHER CUSTOM CHIPS
CDTV will also have other custom chips for handling the CD-ROM interface and IR control.
MEMORY
1 MB (Megabyte) chip RAM; 2K non-volatile RAM reserved for System (clock, prefs, etc.); 512K ROM
INTERNAL SLOTS
Intelligent video slot (for optional genlock, RF board, etc.) 15 pin edge connector; DMA slot — for SCSI, LAN, etc.
VIDEO OUTPUTS
Analog RGB, Digital RGB (DB-23 connector); Composite video NTSC or PAL (RCA connector); Component video
Y-C (S connector type for S-VHS and Hi8); RF Modulated (F connector); Optional genlock capabilities via plug-in
module. Three-mode (CDTV, video source or mixed) under Software control.
VIDEO DISPLAY (GENERAL)
400 lines/vertical frequency 60Hz (NTSC); 512 lines/vertical frequency 50Hz (PAL); Graphic co-processor with beam
synced draw, fill and move modes (blitter); Maximum 1Mb video memory (chip memory); Palette of 4096 colors;
Maximum 6 bitplanes; 8 sprites per scanline
OPERATING SYSTEM
Amiga kickstart 1.3 in ROM; ISO 9660 file System handler; High-speed decompression for graphics, audio and other
data; CD + G, CD-I-midi, CDDA Support
IR (INFRARED) REMOTE UNIT SPECS
Landscape format
Proprietary high-speed IR Signal; Power supplied by 2 AA batteries; 10 numeric keys plus Escape and Enter; Joy/Mouse,
CD/TV and Genlock keys; Button for Up, Down, Left, Right and diagonal movement; Two Select (or Fire) keys : A
and B; CD audio — Reverse, Forward, Play/Pause, Headphone Volume Up-Down and Stop keys
OPTIONAL ACCESSORIES
External floppy disk drive; Trackball; Personal RAM or ROM card; Genlock; Keyboard; Modem
ADDED RAW KEYBOARD CODES
6C Play/Pause; 6D Stop; 6E Fast Forward; 6F Fast Reverse
MEMORY MAP (IN ADDITION TO IM CHIP A500)
Memory Card $E00000-$E000FF
Non-volatile Memory SDC8000
DMAC Auto config., typically SE90000
Tri-port Mapped to DMAC, $B0
COMPUTER GENERATED AUDIO SPECS
4 independent sound channels (right and left); Complex waveforms; Sound buffer up to 128K, unlimited seamless
sound; 8-bit D/A Converter plus 6-bit volume control
AUDIO EXTRAS
Capable of sound mapping Amiga over CD-DA sound.
1-1
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