NewCedarRMAssignments.tioga
Copyright © 1985 by Xerox Corporation. All rights reserved.
Last modified by Rumph, July 29, 1985 5:01:17 pm PDT
Addr Title Use
Region: 0 RMForIFU IFU-addressable
0 NWW New Wakeups Waiting
1 CurrentPSB PDA-relative
2 CurrentTime Current process time, in ticks
3 XferFlags
4 TrapParam Xfer trap parameter
5 XTSReg Xfer trap state
6 WDC Wakeup disable counter
7 MDSHi high part of Main Data Space
10 RTempX
11 RTemp0 General temporaries
12 RTemp1
13 RTemp2
14 RTemp3
15 RTemp4
16 RTemp5 RVRel 16 & 17 must be temps for mul and dev subroutines
17 RTemp6
Region: 1 AEmRegs Alto Emulator (overlaid), accessable to IFU; also RCRegs, registers for the Cedar reference counting op codes.
0 R400 contains the constant 400b
1 TickCount make ticks from interrupts
2 Sticky Stick flags for floating point
3 MaintPanel
4 RCFlags
5 WPOffset Write pointer, relative to WPBR
6 RCWord
7 ZCTBlockLink
10 RCResidue
11 RCResMask residue mask from zct
12 ETemp0, RCTemp0
13 ETemp1, RCTemp2
14 ETemp2, RCTemp3
15 ETemp3, RCTemp3
16 ETemp4 16 & 17 are temporaries for MulSub and DivSub
17 Temp17
Region: 2 BBRegs BitBlt registers, reusable by any other emulator-level microcode
0 BBDst address of next word to process
1 BBSrc
2 DstInc Address increment between scan lines
3 SrcInc negative if working top-to-bottom
4 DRast Raster length (words)
5 SRast
6 PrefDst Address of next munch to PreFetch
7 PrefSrc
10 DPrefOffset Offset of leftmost word of next scan line relative to first word of current scan line
11 SPrefOffset
12 VCount Vertical line count
13 MCount Horizontal munch count
14 ICnt Initial value of Cnt register for word loops
15 BBDisp Control flags and horizontal loop dispatch
16 BBCtrl Control flags
17 SrcWd Leftover source word -- must be RVREL 17
Region: 3 EIRegs Ethernet Input registers
0 EICB Pointer to IOCB being worked on
1 EIPtr Input main loop pointer/count
2 EITemp1
3 EITemp2
4 FltPipe0
5 FltPipe1
6 FltPointers
7 FltErrors
10 FaultVal
11 FaultMapVal
12 FaultInfo
13 FltMemPrt
14 FltTemp
15 FltEmuPC
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17
Region: 4 EORegs Ethernet Output registers
0 EOCB Pointer to IOCB being worked on
1 EOPtr Output main loop pointer/count
2 EOTemp1 Output temporary
3 EOTemp2
4 EOTime Time at end of last packet successfully transmitted
5 RNum State for random number generator
6 RConst Constant (13849) for random number generator
7 AUTPC PC for Asynchronous Utility task requests
10 VirtualBanks Size of VM in units of 64K
11 RealPages Size of real memory in pages
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Region: 5 DiskRegs Disk registers
0 KIOCB IOCB address
1 KDataLo address of end of data block
2 KDataHi
3 KCyl cylinder part of disk address
4 KHdSec head/sector part of disk address
5 Sector sector counter
6 MaxSectors maximum number of sectors expected
7 KPtr command block pointer
10 KCmmd disk command (hardware)
11 DskMAddr memory address for data
12 KStatus disk software status
13 KSelect
14 KTemp0
15 KTemp1
16 KTemp2
17 KTemp3
Region: 6 TWTRegion Alto Terminal (word task) registers
0 TAddress next munch address; also used as WCB flag
1 TCount munch count
2 TNextCount Initial munch count for next scan line
3 TNextAddrLo Long pointer to start of the next scan line
4 TNextAddrHi
5 TReaderPtrReg Initial FIFO address for next scan line
6 TNWrdsMinus1 (scan line length in words)-1
7 TSetNextWCB DHTFlags output← command to set NextWCB flag
10 TChannelReg 0 for Channel A, 100000B for channel B
11 TScratch
12 TDCBChainReg Pointer to next DCB
13 TSLCReg (scan lines remaining)-1 for current DCB
14 TBRHiReg BRHi value for short bitmap addresses
15 LMargConst Left margin NLCB constant
16
17
Region: 7 THTRegion Alto terminal (horizontal task) registers
0 TVCWShadowReg Vertical control bits
1 TFieldAreaReg Remaining scan lines in field
2 TReg400C Constant 400B
3 TTemp0
4 TTemp1
5 TTemp2
6 DisplayConfig bit0: 1 iff DispM (or RastA) installed bit15: iff LF display is connected
7 TCursorYReg (scan lines remaining until cursor) * -2
10 TerminalHi accumulated terminal message
11 TerminalLo
12 BootTimer 0 or duration of boot button push
13 BootState Boot timer and action
14 TopBorderConst Scan lines from end of VSync to start of visible
15 VisibleLineConst All visible scan lines, including top and botton borders
16 VSyncConst Scan lines in vertical sync pulse
17 CursorXConst Cursor X NLCB constant
Region: 10 AChannelRegion Rast A channel registers (RBase must be 0 in bits [2..3])
0 AAddress next munch address
1 ACount munch count
2 ANextCount Initial munch count for next scan line
3 ANextAddrLo Long pointer to start of the next scan line
4 ANextAddrHi
5 AReaderPtrReg Initial FIFO address for next scan line
6 ANWrdsMinus1 (scan line length in words)-1
7 ASetNextWCB
10 AChannelReg 0 for Channel A
11 AScratch
12 AVCWShadowReg Copy of VCWShadowReg
13 AChanCtrlBlkPtr pointer to channel control block
14 AScanLineCount
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17
Region: 11 BChannelRegion Rast B channel registers (RBase must be 1 in bits [2..3])
0 BAddress next munch address
1 BCount munch count
2 BNextCount Initial munch count for next scan line
3 BNextAddrLo Long pointer to start of the next scan line
4 BNextAddrHi
5 BReaderPtrReg Initial FIFO address for next scan line
6 BNWrdsMinus1 (scan line length in words)-1
7 BSetNextWCB
10 BChannelReg 1 for channel B
11 BScratch
12 BVCWShadowReg Copy of VCWShadowReg
13 BChanCtrlBlkPtr pointer to channel control block
14 BScanLineCount
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16
17
Region: 12 CChannelRegion Rast C channel registers (RBase must be 2 in bits [2..3])
0 CAddress next munch address
1 CCount munch count
2 CNextCount Initial munch count for next scan line
3 CNextAddrLo Long pointer to start of the next scan line
4 CNextAddrHi
5 CReaderPtrReg Initial FIFO address for next scan line
6 CNWrdsMinus1 (scan line length in words)-1
7 CSetNextWCB
10 CChannelReg 2 for channel C
11 CScratch
12 CVCWShadowReg Copy of VCWShadowReg
13 CChanCtrlBlkPtr pointer to channel control block
14 CScanLineCount
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17
Region: 12 DChannelRegion Rast D channel registers (RBase must be 2 in bits [2..3])
0 DAddress next munch address
1 DCount munch count
2 DNextCount Initial munch count for next scan line
3 DNextAddrLo Long pointer to start of the next scan line
4 DNextAddrHi
5 DReaderPtrReg Initial FIFO address for next scan line
6 DNWrdsMinus1 (scan line length in words)-1
7 DSetNextWCB
10 DChannelReg 3 for channel D
11 DScratch
12 DVCWShadowReg Copy of VCWShadowReg
13 DChanCtrlBlkPtr pointer to channel control block
14 DScanLineCount
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17
Region: 14 Unused, reserved for FInTask
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Region: 15 LTRegion Raster Line task registers
0 VCWShadowReg Vertical control bits
1 FieldAreaReg Remaining scan lines in field
2 Reg400C Constant 400C
3 HTemp0
4 HTemp1
5 HTemp2
6 HTemp3
7 HTemp4
10 ColorCtrlBlkPtr pointer to color control block
11 MCBFlags infrequent operation flags
12 VBLeadVSTrail vertical control constants
13 VStoVB vertical control constants
14 VisibleLines vertical control constants
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16
17
Region: 16 Events Junk task -- clock and event counters
0 RTClock
1 RTCDeltaLo Constant delta for DDA increment
2 RTC430 copy of VM 430
3 WakeupTime RTClock value at which to wakeup
4 EventAHi0 Event counter shadow registers
5 EventAHi1
6 EventALo
7 EventAPrev
10 EventBHi0
11 EventBHi1
12 EventBLo
13 EventBPrev
14 EventUpdateTimer
15 EventTemp0 Used only by emulator task
16 EventTemp1 Used only by emulator task
17 JunkTemp Used only by junk task
Region: 17 Unused
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