Commodore CDTV - Schematic #252605, Rev. A

Schematic #252605,
Sheet 1 of 12
CDTV SERVICE MANUAL
Rev. A
| SIGNAL |
DESCRIPTION |
i i
| 28MHZ |
28.63636 MHz (NTSC) /28.37516 MHz (PAL) Master Clock I
| 7MHZ |
7 MHz Processor Clock |
| A[23:11
Processor Address (68000) j
| ACK
Data Acknowledge (Parallel) |
| AS
Address Strobe (68000) j
| AUDIN
Audio Input (RS232 lack) j
| AUDOUT
Audio Output (RS232 jack) j
| BEER
Bus Error (68000) j
| BG
Bus Grant (68000) j
| BGACK
Bus Grant Acknowledge (68Ö00) |
| BLISS
Blitter Slowdown (chips) |
| BLIT
Chip Memory Access (chips) j
| BR
Bus Request (68000) |
| BUS Y
Device Busy (parallel) j
| CASL/CASU
CAS lower/upper byte (DRAM) j
| CCK
Color Clock aka CI (chips) j
| CCKQ
Color Clock Quadrature aka C3 (chips) |
| CDAC
7 MHz Quatrature Clock |
| CHNG
Media Chanqe (floppy) |
| CLKRD/CLKWR
Real-time Clock Read/Write |
| CSYNC
Composite Sync (video) j
| CTS
Clear to Send (rs232) j
i D(15:0 1
Processor Data (68000) j
| DIR
Direction (floppy) |
DKRD
Diskette Read Data (floppy) j
| DKWDB
Diskette Write Data (floppy) |
| DKWEB
Diskette Write Enable (floppy) j
| DMAL
Chip DMA Request (chips) |
| DRA(8:0)
DRAM Address (DRAM, chips) |
DRD(15:0)
DRAM Data (DRAM, chips) |
| DSR
Data Set Ready (rs232) j
| DTACK
Data Transfer Acknowledge (68000) |
| DTR Data Terminal Ready (rs232) j
1 E
Peripheral E Clock (68000) j
| EXRAM
Expansion Memory Present j
j FC(0:0)
Function Control (68000) |
| FIRE0/FIRE1
Fire Button (joysticks) j
HLT
Processor Halt (68000) |
HSYNC
Horizontal Sync (video) |
| INDEX Diskette Index Hole (floppy) |
| INT(2,3,6] Interrput Requests (chips) j
| IORESET I/O Reset |
IPL(2 : Ö ]
Processor Interrupt Requests (68000) j
KBCLOCK
Keyboard Clock (keyboard) |
KBDATA
Keyboard Data (keyboard) |
KBRESET
Keyboard Reset (keyboard) |
| LDS/UDS
Upper/Lower Data Strobe (68000) |
| LED
Power On LED |
| SIGNAL |
DESCRI P.TION |
| LEFT/RIGHT
Audio Channels |
| MTR
Motor On (floppy) j
| MTR0 Motor On Drive (floppy) j
| M0V/M0H
Mouse Quadrature Signals (joysticks) |
| MlV/MlH
Mouse Quadrature Signals (joysticks) j
| OVL Overlay ROM over RAM j
| OVR
Override System Decoaeing j
| PIXELSW
Pixel Switch (video) j
1 POTOX/POTOY
Pot Lines (joysticks) |
j POT1X/POT1Y
Pot Lines (joysticks) |
| POUT
Paper Out (parallel) |
| PPD[7:0)
Parallel Port Data (parallel) j
| RAMEN
RAM Enable (chips) j
| REGEN
Chip Register Enable (chips) |
| RAS0/RAS1
RAS Internal/Expansion Lines (DRAM) |
| RDY
Drive Ready (floppy) j
| RESET
General Reset j
| RGA[8:1)
Register Address Bus (chips) j
1 RI
Ring Indicate (rs232) j
| ROMEN
ROM Enable |
| RTS
Request to Send (rs232) j
| RST
Processor Reset (68000) j
| RXD
Receive Data (RS232) |
| RW
Processor Read/Write (68000) |
| SEL
Select (parallel) |
| SEL(3:0 J
Drive Select (floppy) |
| SIDE
Side Select (floppy) |
| STEP
Head Step Command (floppy) j
| TRK0
Track 0 Sense (floppy) |
| TXD Transmit Data (RS232) |
| VMA Valid Memory Address (68000) |
| VPA
Valid Peripheral Address (68000) j
| VSYNC
Verticl Sync (video) 1
| WE
Write Enable (DRAM) I
| WPROT
Write Protect Sense (floppy) j
| XCLK External 28 MHz Clock (genlock) |
| XCLKEN
External Clock Enable (genlock) |
| XRDY
External Data Readv j
AUDL/AUDR
Amiqa Audio Left/Riqht 1
AEMP
Audio Deemphasis 1
| AUPLY
CD Audio Play 1
| BAS
Buffered Address Strobe |
| BCLK
CD Audio Clock I
| BCSMCEN/BCSMCOD
Buffered Chip Select Memory Card Even/Odd |
| BRW
Buffered Processor Read/Write j
| BSEN
Logic Voltage Sense j
| BTXD
Buffer Transmit Data (Midi) j
| BLDS/BUDS Buffered Upper/Lower Data Strobe 1
SIGNAL
DESCRIPTION
C16M
16MHz Dac Clock
CDAL/CDAR
CD Audio Left/Riqht
CD /TV
Select CD/TV (see INCD)
CONFIGIN
Confiq In
CONFIGOUT
Confiq Out
CSCD
Chip Select CDROM Driver
csen/csod '
Chip Select CDROM Driver Even/Odd
CSMC
Chip Select Memory Card
CSMCEN/CSMCOD
Chip Select Memory Card Even/Odd
CSNV Non-Volatile Memory Select
CSRC
Real Time Chip Select
csxo XT Device Chip Select No.O
DACATT
Attinator Data (Dac)
DACLCH
Attinator Latch (Dac)
DACST
Attinator Strobe (Dac)
DATA
CD Audio Data
DMCD Dmac Dma Data
EOP.CSX1
End of Process/XT Device Chip Select No.1
GMSM:01
Genlock Mode Select (Remote Control)
IFRST
Interface Reset
INAC
Indicator Power/Status
INCD
Indicator CD/TV Mode
INTD
CD Drive Reset
INTS
SCSI Interrupt
IOR/IOW
Dmac Read/Write
KBSE
Keyboard Sense
LMUTE
Line Mute
LRCLK
Audio Left/Right Clock
MPS
Power Sense (Logic)
MS C1 :0)
Genlock Mode Select (Amiga)
MUTE
CD Mute
POWER
Main Logic Power On/Off
SD C7:0 J
Dmac XT/SCSI Data
VCK
Attinator Data Clock (Head Phone)
VDATA
Attinator Data Clock (Head Phone)
VF f 2:1J
Filament Voltage
VST
Attinator Data Clock (Head Phone)
VPP
-30V Voltaqe
XA,YA,XB,YB 12:V
Mouse Input Signal
XDACK
XT Device Data Acknowledqe
XDREQ
XT Device Data Requirement
EMC
ENABLE MEMORY CARD
EC 2)
ENABLE CDROM DRIVER (ROM)
WEFROM
WRITE ENABLE E*PROM
5-1