.C - Display the Common ABIOS Data Area

Display ABOIS Command Data Area information.

Syntax:

────.C ────────────────────────────────────────────────

Parameters: None

Results & Notes:

.C displays data for each logical device ID anchored from the Common ABIOS Data Area (CDA). If the ABIOS is not present or initialised then the following message is displayed:

       ABIOS Not Present or Not Initialised

The presence of ABIOS is indicated by a non-zero byte value located at symbol:

ABIOS_Present.

If the ABIOS is present and initialised then data based on the Logical Device ID (LID) table is displayed. The LID Table is located from a selector located at:

ABIOS_CDS_ANCHOR_p - in protect mode, or

ABIOS_CDS_ANCHOR_r - in real mode

Tabular data of the following form is displayed:

  LID(0000)  Type=Reserved     DB=001e:0114  FTT=0000:0000
  LID(0001)  Type=Null         DB=0000:0000  FTT=0000:0000
  LID(0002)  Type=Internal     DB=0438:06f0  FTT=0448:011c
  LID(0003)  Type=Diskette     DB=0438:0728  FTT=0448:012c
  LID(0004)  Type=Video        DB=0438:07a4  FTT=0448:017c
  LID(0005)  Type=Keyboard     DB=0438:07e4  FTT=0448:01e4
  LID(0006)  Type=Printer      DB=0438:080c  FTT=0448:0238
  LID(0007)  Type=Asynch       DB=0438:082c  FTT=0448:0280
  LID(0008)  Type=SysTimer     DB=0438:084c  FTT=0448:02e8
  LID(0009)  Type=RTCTimer     DB=0438:0860  FTT=0448:0328
  LID(000a)  Type=SysService   DB=0438:087c  FTT=0448:0380
  LID(000b)  Type=NMInterrupt  DB=0438:08a0  FTT=0448:03cc
  LID(000c)  Type=PointDevice  DB=0438:08d8  FTT=0448:0404
  LID(000d)  Type=DMA          DB=0438:08f0  FTT=0448:044c
  LID(000e)  Type=Security     DB=0438:0920  FTT=0448:04a4
  LID(000f)  Type=POS          DB=0438:0938  FTT=0448:04f0
  LID(0010)  Type=CMOSRam      DB=0438:0960  FTT=0448:0538
  LID(0011)  Type=ErrorLog     DB=0438:0978  FTT=0448:0574
  LID(0012)  Type==  DB=0438:0990  FTT=0448:05ac
  LID(0013)  Type=Disk         DB=0438:09d8  FTT=0448:060c
  LID(0014)  Type=anonymous)  DB=0438:0a50  FTT=0448:0684
  LID(0015)  Type=Null         DB=0000:0000  FTT=0000:0000
  LID(0016)  Type=Null         DB=0000:0000  FTT=0000:0000
  LID(0017)  Type=Null         DB=0000:0000  FTT=0000:0000
  LID(0018)  Type=Null         DB=0000:0000  FTT=0000:0000
  LID(0019)  Type=Null         DB=0000:0000  FTT=0000:0000
  LID(001a)  Type=Null         DB=0000:0000  FTT=0000:0000
  LID(001b)  Type=Null         DB=0000:0000  FTT=0000:0000
  LID(001c)  Type=Null         DB=0000:0000  FTT=0000:0000
  LID(001d)  Type=Null         DB=0000:0000  FTT=0000:0000

Note: There is a formatting error that is illustrated in LID 12 and LID 14 lines. See description below of type= parameter for an explanation of this!

The fields displayed have the following meaning:

LID

Logical Device ID.

┌────────────┬───┬───┬─────┬────────────────────┐
│Field Name  │Off│Len│Type │Description         │
├────────────┼───┼───┼─────┼────────────────────┤
│DataPtr     │+0 │6  │     │Data Pointer in CDA │
├────────────┼───┼───┼─────┼────────────────────┤
│DLimit      │+0 │2  │W    │Limit Field         │
├────────────┼───┼───┼─────┼────────────────────┤
│DOffset     │+2 │2  │W    │Offset Field        │
├────────────┼───┼───┼─────┼────────────────────┤
│DSegment    │+4 │2  │W    │Segment Field       │
└────────────┴───┴───┴─────┴────────────────────┘

┌────────────┬───┬───┬─────┬────────────────────┐
│Field Name  │Off│Len│Type │Description         │
├────────────┼───┼───┼─────┼────────────────────┤
│PhysPtr     │+0 │6  │     │Physical Data       │
│            │   │   │     │Pointer (INTEL      │
│            │   │   │     │Format)             │
├────────────┼───┼───┼─────┼────────────────────┤
│            │+0 │2  │W    │Limit Field         │
├────────────┼───┼───┼─────┼────────────────────┤
│PhysLSW     │+2 │2  │W    │Lo Order 16 bits    │
├────────────┼───┼───┼─────┼────────────────────┤
│PhysMSW     │+4 │2  │W    │Hi Order 16 bits    │
└────────────┴───┴───┴─────┴────────────────────┘

Type=

This an interpretation of the device type (DevID) field taken from the corresponding Device Block. The following Type values may appear:

Reserved

Used only for the LID(0000) dummy entry.
Null
signifies an unused entry (DB=0000:0000).
Internal
Devid=0000 used for internal ABIOS calls.
Diskette
Devid=0001 Diskette device.
Disk
Devid=0002 Disk device.
Video
Devid=0003 Video device.
Keyboard
Devid=0004 Keyboard.
Printer
Devid=0005 Printer.
Asynch
Devid=0006 Asynchronous device.
SysTimer
Devid=0007 System Timer.
RTCTimer
Devid=0008 RTC Timer.
SysService
Devid=0009 SysService.
NMInterrupt
Devid=000a NMI Interrupt.
PointDevice
Devid=000b Pointer Device.
LightPen
Devid=000c Light Pen.
JoyStick
Devid=000d JoyStick.
CMOSRam
Devid=000e CMOS RAM.
DMA
Devid=000f DMA controller.
POS
Devid=0010 Programmable Option Select.
ErrorLog
Devid=0011 Error Log.
S/A Dump
Devid=0012 Stand Alone Dump.
IOPortAlloc.
Devid=0013 I/O Port Allocation.
Audiotone
Devid=0014 Audio device.
Int/8259
Devid=0015 Interrupt Controller.
Security
Devid=0016 Keyboard Security.
Other Device Types are in use but are not translated to a predictable name.

For example:

Devid=0017

SCSI Subsystem Interface
Devid=0018
SCSI Peripheral
Where this occurs the Devid may be found at offset +8 of the device block.
DB=sel:off
sel:off address of the Device Block for the corresponding LID. The device block has the following standard header structure:

┌────────────┬───┬───┬─────┬────────────────────┐│Field Name  │Off│Len│Type │Description         │
├────────────┼───┼───┼─────┼────────────────────┤
│DeviceBlock │+0 │8  │     │Device Block Header │
├────────────┼───┼───┼─────┼────────────────────┤
│DevBlength  │+0 │2  │W    │Device Block Length │
├────────────┼───┼───┼─────┼────────────────────┤
│Revision    │+2 │1  │B    │Revision            │
├────────────┼───┼───┼─────┼────────────────────┤
│            │+3 │1  │B    │Reserved            │
├────────────┼───┼───┼─────┼────────────────────┤
│            │+4 │2  │W    │Logical ID          │
├────────────┼───┼───┼─────┼────────────────────┤
│Devid       │+6 │2  │W    │Device ID           │
└────────────┴───┴───┴─────┴────────────────────┘

FTT=sel:off
sel:off address to the Function Transfer Table for this LID. The FTT has the following standard header structure:

┌────────────┬───┬───┬─────┬────────────────────────────────────┐
│Field Name  │Off│Len│Type │Description                         │
├────────────┼───┼───┼─────┼────────────────────────────────────┤
│FTTable     │+0 │16 │     │Function Transfer Table Header      │
├────────────┼───┼───┼─────┼────────────────────────────────────┤
│FStart      │+0 │4  │D    │Start Routine Entry Point           │
├────────────┼───┼───┼─────┼────────────────────────────────────┤
│FInt        │+4 │4  │D    │Interrupt Routine Entry Point       │
├────────────┼───┼───┼─────┼────────────────────────────────────┤
│FTimeO      │+8 │4  │D    │Start Routine Entry Point           │
├────────────┼───┼───┼─────┼────────────────────────────────────┤
│FuncCount   │+c │2  │W    │Count of Functions                  │
├────────────┼───┼───┼─────┼────────────────────────────────────┤
│            │+e │2  │W    │Reserved                            │
└────────────┴───┴───┴─────┴────────────────────────────────────┘

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