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Docs/HPC
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File contents
File : HPC
Date : 07-Dec-97
Author : � A.Thoukydides, 1995, 1996, 1997
Description : High-level Procedure Call (HPC) services implemented by the
ARMEdit module.
INTRODUCTION
The ARMEdit module provides a number of HPC services. To allow development to
start before HPC is included in the PC front-end software, and to support
earlier releases of the front-end software, a simplified interface via I/O
ports is also supported.
All of the services in this document use the HPC service identifier &105
which has been allocated by Aleph One.
I/O PORT ACCESS
The following I/O port assignments are currently used:
&2E0 PORT_STATUS Word read
&2E0 PORT_CMD Word write
&2E2 PORT_DATA Byte or word read/write
The following sequence of operations should occur to perform an HPC call:
Read PORT_STATUS. The possible return codes are:
&454D System is available and ready.
&4D45 System is currently busy processing another HPC call, and
cannot currently be used for another call.
Any other code indicates that the service is not available.
Write &0000 to PORT_CMD to start transfer of data.
Write the HPC packet data to PORT_DATA as either bytes or words.
Write &0001 to PORT_CMD to perform the HPC call.
Write &0002 to PORT_CMD to start reading the reply.
Read the HPC reply packet from PORT_DATA as either bytes or words.
Write &0003 to PORT_CMD to reset the HPC system.
The port based HPC packets have the same 16384 byte limit that proper HPC
packets have.
Note that only HPC services provided by the ARMEdit module can be called
using this I/O port system; other services can only be called via the normal
HPC system. However, the HPC identifier is still checked.
HPC CALLS
For details of making HPC calls directly (which is potentially much more
efficient) contact Aleph One, as the information is covered by a Non
Disclosure Agreement.
RETURN CODES
All of the HPC calls place a 4 byte return code at the start of the return
block. The generic values are
&0000 The operation was successful.
&0001 The operation failed. The exact meaning of this depends upon the
reason code, but in general it indicates that the rest of the
return block is invalid.
&FFFF Service or reason code is unknown.
See the individual reason codes for details of any other codes returned, and
any contents of the remainder of the return block.
HPC_ARMEDIT_SWI
Calls a specified RISC OS SWI by number. The SWI is always called with
the X (error returning) bit set.
Data sent:
Offset Size Description
0 2 HPC service ID.
2 2 Reason code = &0000.
4 4 SWI number.
8 40 Values for registers R0 to R9 on entry to the SWI.
Data returned:
Offset Size Description
0 4 Return code.
4 256 RISC OS style error block returned by SWI if the
return code is &0001.
260 40 Values of registers R0 to R9 on exit from the SWI if
the return code is &0000.
HPC_ARMEDIT_READ
Read ARM memory.
Data sent:
Offset Size Description
0 2 HPC service ID.
2 2 Reason code = &0001.
4 4 Start address of memory to read.
8 4 Number of bytes to read. (n <= 16380)
Data returned:
Offset Size Description
0 4 Return code.
4 n The contents of the specified memory.
HPC_ARMEDIT_WRITE
Write ARM memory.
Data sent:
Offset Size Description
0 2 HPC service ID.
2 2 Reason code = &0002.
4 4 Start address of memory to read.
8 4 Number of bytes to write. (n <= 16372)
12 n The data to write.
Data returned:
Offset Size Description
0 4 Return code.
HPC_ARMEDIT_ALLOC
Claim a block of ARM memory. This is automatically released when the PC
is shutdown or reset, but it is better to free it when no longer required
using HPC_ARMEDIT_FREE.
Data sent:
Offset Size Description
0 2 HPC service ID.
2 2 Reason code = &0003.
4 4 Amount of memory to claim.
Data returned:
Offset Size Description
0 4 Return code.
4 4 Address of the block of memory allocated.
HPC_ARMEDIT_FREE
Release a block of ARM memory previously claimed using HPC_ARMEDIT_ALLOC.
Data sent:
Offset Size Description
0 2 HPC service ID.
2 2 Reason code = &0004.
4 4 The address of the block of memory.
Data returned:
Offset Size Description
0 4 Return code.
HPC_ARMEDIT_EXTTYPE
Convert a DOS extension into a RISC OS filetype.
Data sent:
Offset Size Description
0 2 HPC service ID.
2 2 Reason code = &0005.
4 4 The extension in upper case padded with 0 bytes to
four characters.
Data returned:
Offset Size Description
0 4 Return code.
4 4 The RISC OS filetype.
HPC_ARMEDIT_TYPEEXT
Convert a RISC OS filetype into a DOS extension.
Data sent:
Offset Size Description
0 2 HPC service ID.
2 2 Reason code = &0006.
4 4 The RISC OS filetype.
Data returned:
Offset Size Description
0 4 Return code.
4 4 The extension in upper case padded with 0 bytes to
four characters.
HPC_ARMEDIT_FOPEN
Open a RISC OS file. This is automatically closed when the PC is shutdown
or reset, but it is better to close it when no longer required using
HPC_ARMEDIT_CLOSE. A file opened using this call should not be closed
using RISC OS routines directly.
Data sent:
Offset Size Description
0 2 HPC service ID.
2 2 Reason code = &0007.
4 4 -1 to open existing file, or initial size of file to
create a new one.
8 4 Non-zero to automatically delete file when closed.
12 n Name of file to open.
Data returned:
Offset Size Description
0 4 Return code.
4 4 RISC OS file handle.
HPC_ARMEDIT_FCLOSE
Close a RISC OS file previously opened using HPC_ARMEDIT_OPEN. The file
is deleted if specified when the file was opened.
Data sent:
Offset Size Description
0 2 HPC service ID.
2 2 Reason code = &0008.
4 4 RISC OS file handle.
Data returned:
Offset Size Description
0 4 Return code.
HPC_ARMEDIT_FREAD
Read from a RISC OS file.
Data sent:
Offset Size Description
0 2 HPC service ID.
2 2 Reason code = &0009.
4 4 RISC OS file handle.
8 4 Sequential file pointer for start of block, or -1 for
current position.
12 4 Number of bytes to read.
Data returned:
Offset Size Description
0 4 Return code.
4 4 Number of bytes read.
8 n The data read from the file.
HPC_ARMEDIT_FWRITE
Write to a RISC OS file.
Data sent:
Offset Size Description
0 2 HPC service ID.
2 2 Reason code = &000A.
4 4 RISC OS file handle.
8 4 Sequential file pointer for start of block, or -1 for
current position.
12 4 Number of bytes to write.
16 n The data to write to the file.
Data returned:
Offset Size Description
0 4 Return code.
HPC_ARMEDIT_TALK_START
Register a new client task. Note that a client ID of 0 is assumed.
It does not make sense being able to request notification of reset or
shutdown.
Data sent:
Offset Size Description
0 2 HPC service ID.
2 2 Reason code = &000B.
Data returned:
Offset Size Description
0 4 Return code.
4 4 A unique client handle.
HPC_ARMEDIT_TALK_END
Deregister a client task.
Data sent:
Offset Size Description
0 2 HPC service ID.
2 2 Reason code = &000C.
4 4 The previously assigned handle for this client task.
Data returned:
Offset Size Description
0 4 Return code.
HPC_ARMEDIT_TALK_TX
Send a message to another client task.
Data sent:
Offset Size Description
0 2 HPC service ID.
2 2 Reason code = &000D.
4 4 Client handle for this task.
8 4 Either the ID or client handle for the recipient.
12 1024 The message to send.
Data returned:
Offset Size Description
0 4 Return code.
HPC_ARMEDIT_TALK_RX
Check for any waiting messages for this client task. The return code is
failure if there is no message waiting. There is no acknowledge call
since all messages to PC software should be addressed to a particular
handle.
Data sent:
Offset Size Description
0 2 HPC service ID.
2 2 Reason code = &000E.
4 4 Client handle for this task.
Data returned:
Offset Size Description
0 4 Return code.
4 4 Source ID.
8 4 Source client handle.
12 1024 The waiting message.
HPC_ARMEDIT_DEVICE_INITIALISE
Called during initialisation of device driver to obtain a start-up
banner message and choose the number of devices.
Data sent:
Offset Size Description
0 2 HPC service ID.
2 2 Reason code = &000F.
4 1 Drive number for first unit of this driver.
5 256 Text after equals sign on CONFIG.SYS line that loaded
this driver.
Data returned:
Offset Size Description
0 4 Return code.
4 4 Number of devices supported.
8 256 Text of message terminated by a "$" character.
HPC_ARMEDIT_DEVICE_BPB
Construct a BIOS Parameter Block (BPB) for a device driver. This also
informs ARMEdit that the disc contents could be changed.
Data sent:
Offset Size Description
0 2 HPC service ID.
2 2 Reason code = &0010.
4 1 Unit code (drive number), or -1 for initialisation.
Data returned:
Offset Size Description
0 4 Return code.
4 13 The BIOS parameter block.
HPC_ARMEDIT_DEVICE_CHANGED
Perform a media check for a device driver.
Data sent:
Offset Size Description
0 2 HPC service ID.
2 2 Reason code = &0011.
4 1 Unit code (drive number).
Data returned:
Offset Size Description
0 4 Return code.
4 4 The media change code:
-1 Disc has been changed.
0 Don't know if disc has been changed.
1 Disc has not been changed.
HPC_ARMEDIT_DEVICE_READ
Read an emulated disc sector for a device driver.
Data sent:
Offset Size Description
0 2 HPC service ID.
2 2 Reason code = &0012.
4 1 Unit code (drive number).
5 2 Sector number.
Data returned:
Offset Size Description
0 4 Return code.
4 n The data read from the sector.
HPC_ARMEDIT_DEVICE_WRITE
Write an emulated disc sector for a device driver.
Data sent:
Offset Size Description
0 2 HPC service ID.
2 2 Reason code = &0013.
4 1 Unit code (drive number).
5 2 Sector number.
7 1 Dummy data to pad to word boundary.
8 n The data to write to the sector.
Data returned:
Offset Size Description
0 4 Return code.
HPC_ARMEDIT_DATE_TO_DOS
Convert a time and date from the standard RISC OS 5 bytes format to the
4 byte DOS equivalent.
Data sent:
Offset Size Description
0 2 HPC service ID.
2 2 Reason code = &0014.
4 5 Centiseconds since 00:00:00 on January 1 1900.
Data returned:
Offset Size Description
0 4 Return code.
4 4 2 byte time (hhhhhmmmmmmsssss).
8 4 2 byte date (yyyyyyymmmmddddd).
HPC_ARMEDIT_DATE_TO_RISCOS
Convert a time and date from the standard DOS 4 byte format to the 5 byte
RISC OS equivalent.
Data sent:
Offset Size Description
0 2 HPC service ID.
2 2 Reason code = &0015.
4 2 2 byte time (hhhhhmmmmmmsssss).
6 2 2 byte date (yyyyyyymmmmddddd).
Data returned:
Offset Size Description
0 4 Return code.
4 5 Centiseconds since 00:00:00 on January 1 1900.
HPC_ARMEDIT_OSCLI_START
Start executing a specified *command. The input and output from the
command are redirected.
Data sent:
Offset Size Description
0 2 HPC service ID.
2 2 Reason code = &0016.
4 256 The command to execute.
Data returned:
Offset Size Description
0 4 Return code.
4 4 Handle for this command.
HPC_ARMEDIT_OSCLI_POLL
Continue execution of a *command. This should only include input data if
requested by the previous HPC_ARMEDIT_OSCLI_POLL reply, otherwise
characters may get lost.
Data sent:
Offset Size Description
0 2 HPC service ID.
2 2 Reason code = &0017.
4 4 Command handle.
8 4 Number of bytes to input.
12 256 Up to 256 bytes of input.
Data returned:
Offset Size Description
0 4 Return code.
4 4 Status:
0 Active.
1 Command has finished.
2 Waiting for input.
8 4 Number of bytes to output.
12 256 Up to 256 bytes of output.
HPC_ARMEDIT_OSCLI_END
Terminate execution of a *command.
Data sent:
Offset Size Description
0 2 HPC service ID.
2 2 Reason code = &0018.
4 4 Command handle.
Data returned:
Offset Size Description
0 4 Return code.
4 256 RISC OS style error block returned by the command if
the return code is &0001.
HPC_ARMEDIT_TALK_REPLY
Reply to a message from another client task. This is like
HPC_ARMEDIT_TALK_TX, except that the message is stored in the destination
task's buffer.
Data sent:
Offset Size Description
0 2 HPC service ID.
2 2 Reason code = &0019.
4 4 Client handle for this task.
8 4 The client handle for the recipient.
12 1024 The message to send.
Data returned:
Offset Size Description
0 4 Return code.
HPC_ARMEDIT_FASTER
Prevent multitasking to speed up operations. This should be called to
reenable normal operation after the operation is completed. A sensible
way to use this is with a value of 100 (for 1 second), called on a
regular basis during the operation.
Data sent:
Offset Size Description
0 2 HPC service ID.
2 2 Reason code = &001A.
4 4 Centiseconds to disable multitasking for, or 0 to
restore normal operation.
Data returned:
Offset Size Description
0 4 Return code.
HPC_ARMEDIT_TEMPORARY
Produce a unique filename for a temporary RISC OS file.
Data sent:
Offset Size Description
0 2 HPC service ID.
2 2 Reason code = &001B.
Data returned:
Offset Size Description
0 4 Return code.
4 256 Suggested canonicalised filename.
HPC_ARMEDIT_DEVICE_READ_LONG
Read an emulated disc sector for a device driver with a 32bit sector
number.
Data sent:
Offset Size Description
0 2 HPC service ID.
2 2 Reason code = &001C.
4 1 Unit code (drive number).
5 3 Dummy data to pad to word boundary.
8 4 Sector number.
Data returned:
Offset Size Description
0 4 Return code.
4 n The data read from the sector.
HPC_ARMEDIT_DEVICE_WRITE_LONG
Write an emulated disc sector for a device driver with a 32bit sector
number.
Data sent:
Offset Size Description
0 2 HPC service ID.
2 2 Reason code = &001D.
4 1 Unit code (drive number).
5 3 Dummy data to pad to word boundary.
8 4 Sector number.
12 n The data to write to the sector.
Data returned:
Offset Size Description
0 4 Return code.
HPC_ARMEDIT_DEVICE_OPEN
A file is being opened on the device.
Data sent:
Offset Size Description
0 2 HPC service ID.
2 2 Reason code = &001E.
4 1 Unit code (drive number).
Data returned:
Offset Size Description
0 4 Return code.
HPC_ARMEDIT_DEVICE_CLOSE
A file is being closed on the device.
Data sent:
Offset Size Description
0 2 HPC service ID.
2 2 Reason code = &001F.
4 1 Unit code (drive number).
Data returned:
Offset Size Description
0 4 Return code.
HPC_ARMEDIT_DEVICE_REMOVABLE
Check if a device is removable.
Data sent:
Offset Size Description
0 2 HPC service ID.
2 2 Reason code = &0020.
4 1 Unit code (drive number).
Data returned:
Offset Size Description
0 4 Return code.
4 4 The removable device status:
&0000 Removable
&0200 Nonremovable
THINGS TO DO
The following are changes that may be made to the HPC services sometime in
the future.
None at the moment!
VERSION HISTORY
0.00 (12-Nov-95) Original development version.
0.01 (14-Nov-95) No changes to HPC.
0.02 (15-Nov-95) No changes to HPC.
0.03 (17-Nov-95) Uses correct HPC service identifier.
0.04 (21-Nov-95) Slightly more experimental device driver support.
Real HPC system implemented.
0.07 (28-Dec-95) Added message passing protocol.
1.00 (15-Dec-95) First official release version.
1.01 (11-Mar-96) Version number updated to match the module.
1.02 (27-May-96) Implemented device driver calls.
Added commands to convert between date and time formats.
Included SWI for use by Acorn's software PC emulator.
1.03 (21-Feb-97) Added ability to reply to messages.
Included ability to speed up operations when multitasking.
Temporary RISC OS filenames can now be generated.
1.04 (07-Dec-97) Added device driver operations for 32bit sector numbers.
Included device driver support for removable media. 00000000 46 69 6c 65 20 20 20 20 20 20 20 20 3a 20 48 50 |File : HP| 00000010 43 0a 44 61 74 65 20 20 20 20 20 20 20 20 3a 20 |C.Date : | 00000020 30 37 2d 44 65 63 2d 39 37 0a 41 75 74 68 6f 72 |07-Dec-97.Author| 00000030 20 20 20 20 20 20 3a 20 a9 20 41 2e 54 68 6f 75 | : . A.Thou| 00000040 6b 79 64 69 64 65 73 2c 20 31 39 39 35 2c 20 31 |kydides, 1995, 1| 00000050 39 39 36 2c 20 31 39 39 37 0a 44 65 73 63 72 69 |996, 1997.Descri| 00000060 70 74 69 6f 6e 20 3a 20 48 69 67 68 2d 6c 65 76 |ption : High-lev| 00000070 65 6c 20 50 72 6f 63 65 64 75 72 65 20 43 61 6c |el Procedure Cal| 00000080 6c 20 28 48 50 43 29 20 73 65 72 76 69 63 65 73 |l (HPC) services| 00000090 20 69 6d 70 6c 65 6d 65 6e 74 65 64 20 62 79 20 | implemented by | 000000a0 74 68 65 0a 20 20 20 20 20 20 20 20 20 20 20 20 |the. | 000000b0 20 20 41 52 4d 45 64 69 74 20 6d 6f 64 75 6c 65 | ARMEdit module| 000000c0 2e 0a 0a 0a 49 4e 54 52 4f 44 55 43 54 49 4f 4e |....INTRODUCTION| 000000d0 0a 0a 54 68 65 20 41 52 4d 45 64 69 74 20 6d 6f |..The ARMEdit mo| 000000e0 64 75 6c 65 20 70 72 6f 76 69 64 65 73 20 61 20 |dule provides a | 000000f0 6e 75 6d 62 65 72 20 6f 66 20 48 50 43 20 73 65 |number of HPC se| 00000100 72 76 69 63 65 73 2e 20 54 6f 20 61 6c 6c 6f 77 |rvices. To allow| 00000110 20 64 65 76 65 6c 6f 70 6d 65 6e 74 20 74 6f 0a | development to.| 00000120 73 74 61 72 74 20 62 65 66 6f 72 65 20 48 50 43 |start before HPC| 00000130 20 69 73 20 69 6e 63 6c 75 64 65 64 20 69 6e 20 | is included in | 00000140 74 68 65 20 50 43 20 66 72 6f 6e 74 2d 65 6e 64 |the PC front-end| 00000150 20 73 6f 66 74 77 61 72 65 2c 20 61 6e 64 20 74 | software, and t| 00000160 6f 20 73 75 70 70 6f 72 74 0a 65 61 72 6c 69 65 |o support.earlie| 00000170 72 20 72 65 6c 65 61 73 65 73 20 6f 66 20 74 68 |r releases of th| 00000180 65 20 66 72 6f 6e 74 2d 65 6e 64 20 73 6f 66 74 |e front-end soft| 00000190 77 61 72 65 2c 20 61 20 73 69 6d 70 6c 69 66 69 |ware, a simplifi| 000001a0 65 64 20 69 6e 74 65 72 66 61 63 65 20 76 69 61 |ed interface via| 000001b0 20 49 2f 4f 0a 70 6f 72 74 73 20 69 73 20 61 6c | I/O.ports is al| 000001c0 73 6f 20 73 75 70 70 6f 72 74 65 64 2e 0a 0a 41 |so supported...A| 000001d0 6c 6c 20 6f 66 20 74 68 65 20 73 65 72 76 69 63 |ll of the servic| 000001e0 65 73 20 69 6e 20 74 68 69 73 20 64 6f 63 75 6d |es in this docum| 000001f0 65 6e 74 20 75 73 65 20 74 68 65 20 48 50 43 20 |ent use the HPC | 00000200 73 65 72 76 69 63 65 20 69 64 65 6e 74 69 66 69 |service identifi| 00000210 65 72 20 26 31 30 35 0a 77 68 69 63 68 20 68 61 |er &105.which ha| 00000220 73 20 62 65 65 6e 20 61 6c 6c 6f 63 61 74 65 64 |s been allocated| 00000230 20 62 79 20 41 6c 65 70 68 20 4f 6e 65 2e 0a 0a | by Aleph One...| 00000240 0a 49 2f 4f 20 50 4f 52 54 20 41 43 43 45 53 53 |.I/O PORT ACCESS| 00000250 0a 0a 54 68 65 20 66 6f 6c 6c 6f 77 69 6e 67 20 |..The following | 00000260 49 2f 4f 20 70 6f 72 74 20 61 73 73 69 67 6e 6d |I/O port assignm| 00000270 65 6e 74 73 20 61 72 65 20 63 75 72 72 65 6e 74 |ents are current| 00000280 6c 79 20 75 73 65 64 3a 0a 0a 20 20 20 20 26 32 |ly used:.. &2| 00000290 45 30 20 20 20 20 50 4f 52 54 5f 53 54 41 54 55 |E0 PORT_STATU| 000002a0 53 20 57 6f 72 64 20 72 65 61 64 0a 20 20 20 20 |S Word read. | 000002b0 26 32 45 30 20 20 20 20 50 4f 52 54 5f 43 4d 44 |&2E0 PORT_CMD| 000002c0 20 20 20 20 57 6f 72 64 20 77 72 69 74 65 0a 20 | Word write. | 000002d0 20 20 20 26 32 45 32 20 20 20 20 50 4f 52 54 5f | &2E2 PORT_| 000002e0 44 41 54 41 20 20 20 42 79 74 65 20 6f 72 20 77 |DATA Byte or w| 000002f0 6f 72 64 20 72 65 61 64 2f 77 72 69 74 65 0a 0a |ord read/write..| 00000300 54 68 65 20 66 6f 6c 6c 6f 77 69 6e 67 20 73 65 |The following se| 00000310 71 75 65 6e 63 65 20 6f 66 20 6f 70 65 72 61 74 |quence of operat| 00000320 69 6f 6e 73 20 73 68 6f 75 6c 64 20 6f 63 63 75 |ions should occu| 00000330 72 20 74 6f 20 70 65 72 66 6f 72 6d 20 61 6e 20 |r to perform an | 00000340 48 50 43 20 63 61 6c 6c 3a 0a 0a 20 20 20 20 52 |HPC call:.. R| 00000350 65 61 64 20 50 4f 52 54 5f 53 54 41 54 55 53 2e |ead PORT_STATUS.| 00000360 20 54 68 65 20 70 6f 73 73 69 62 6c 65 20 72 65 | The possible re| 00000370 74 75 72 6e 20 63 6f 64 65 73 20 61 72 65 3a 0a |turn codes are:.| 00000380 20 20 20 20 0a 20 20 20 20 20 20 20 20 26 34 35 | . &45| 00000390 34 44 20 20 20 53 79 73 74 65 6d 20 69 73 20 61 |4D System is a| 000003a0 76 61 69 6c 61 62 6c 65 20 61 6e 64 20 72 65 61 |vailable and rea| 000003b0 64 79 2e 0a 0a 20 20 20 20 20 20 20 20 26 34 44 |dy... &4D| 000003c0 34 35 20 20 20 53 79 73 74 65 6d 20 69 73 20 63 |45 System is c| 000003d0 75 72 72 65 6e 74 6c 79 20 62 75 73 79 20 70 72 |urrently busy pr| 000003e0 6f 63 65 73 73 69 6e 67 20 61 6e 6f 74 68 65 72 |ocessing another| 000003f0 20 48 50 43 20 63 61 6c 6c 2c 20 61 6e 64 0a 20 | HPC call, and. | 00000400 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 63 | c| 00000410 61 6e 6e 6f 74 20 63 75 72 72 65 6e 74 6c 79 20 |annot currently | 00000420 62 65 20 75 73 65 64 20 66 6f 72 20 61 6e 6f 74 |be used for anot| 00000430 68 65 72 20 63 61 6c 6c 2e 0a 0a 20 20 20 20 20 |her call... | 00000440 20 20 20 41 6e 79 20 6f 74 68 65 72 20 63 6f 64 | Any other cod| 00000450 65 20 69 6e 64 69 63 61 74 65 73 20 74 68 61 74 |e indicates that| 00000460 20 74 68 65 20 73 65 72 76 69 63 65 20 69 73 20 | the service is | 00000470 6e 6f 74 20 61 76 61 69 6c 61 62 6c 65 2e 0a 0a |not available...| 00000480 20 20 20 20 57 72 69 74 65 20 26 30 30 30 30 20 | Write &0000 | 00000490 74 6f 20 50 4f 52 54 5f 43 4d 44 20 74 6f 20 73 |to PORT_CMD to s| 000004a0 74 61 72 74 20 74 72 61 6e 73 66 65 72 20 6f 66 |tart transfer of| 000004b0 20 64 61 74 61 2e 0a 0a 20 20 20 20 57 72 69 74 | data... Writ| 000004c0 65 20 74 68 65 20 48 50 43 20 70 61 63 6b 65 74 |e the HPC packet| 000004d0 20 64 61 74 61 20 74 6f 20 50 4f 52 54 5f 44 41 | data to PORT_DA| 000004e0 54 41 20 61 73 20 65 69 74 68 65 72 20 62 79 74 |TA as either byt| 000004f0 65 73 20 6f 72 20 77 6f 72 64 73 2e 0a 0a 20 20 |es or words... | 00000500 20 20 57 72 69 74 65 20 26 30 30 30 31 20 74 6f | Write &0001 to| 00000510 20 50 4f 52 54 5f 43 4d 44 20 74 6f 20 70 65 72 | PORT_CMD to per| 00000520 66 6f 72 6d 20 74 68 65 20 48 50 43 20 63 61 6c |form the HPC cal| 00000530 6c 2e 0a 20 20 20 20 0a 20 20 20 20 57 72 69 74 |l.. . Writ| 00000540 65 20 26 30 30 30 32 20 74 6f 20 50 4f 52 54 5f |e &0002 to PORT_| 00000550 43 4d 44 20 74 6f 20 73 74 61 72 74 20 72 65 61 |CMD to start rea| 00000560 64 69 6e 67 20 74 68 65 20 72 65 70 6c 79 2e 0a |ding the reply..| 00000570 20 20 20 20 0a 20 20 20 20 52 65 61 64 20 74 68 | . Read th| 00000580 65 20 48 50 43 20 72 65 70 6c 79 20 70 61 63 6b |e HPC reply pack| 00000590 65 74 20 66 72 6f 6d 20 50 4f 52 54 5f 44 41 54 |et from PORT_DAT| 000005a0 41 20 61 73 20 65 69 74 68 65 72 20 62 79 74 65 |A as either byte| 000005b0 73 20 6f 72 20 77 6f 72 64 73 2e 0a 20 20 20 20 |s or words.. | 000005c0 0a 20 20 20 20 57 72 69 74 65 20 26 30 30 30 33 |. Write &0003| 000005d0 20 74 6f 20 50 4f 52 54 5f 43 4d 44 20 74 6f 20 | to PORT_CMD to | 000005e0 72 65 73 65 74 20 74 68 65 20 48 50 43 20 73 79 |reset the HPC sy| 000005f0 73 74 65 6d 2e 0a 0a 54 68 65 20 70 6f 72 74 20 |stem...The port | 00000600 62 61 73 65 64 20 48 50 43 20 70 61 63 6b 65 74 |based HPC packet| 00000610 73 20 68 61 76 65 20 74 68 65 20 73 61 6d 65 20 |s have the same | 00000620 31 36 33 38 34 20 62 79 74 65 20 6c 69 6d 69 74 |16384 byte limit| 00000630 20 74 68 61 74 20 70 72 6f 70 65 72 20 48 50 43 | that proper HPC| 00000640 0a 70 61 63 6b 65 74 73 20 68 61 76 65 2e 0a 0a |.packets have...| 00000650 4e 6f 74 65 20 74 68 61 74 20 6f 6e 6c 79 20 48 |Note that only H| 00000660 50 43 20 73 65 72 76 69 63 65 73 20 70 72 6f 76 |PC services prov| 00000670 69 64 65 64 20 62 79 20 74 68 65 20 41 52 4d 45 |ided by the ARME| 00000680 64 69 74 20 6d 6f 64 75 6c 65 20 63 61 6e 20 62 |dit module can b| 00000690 65 20 63 61 6c 6c 65 64 0a 75 73 69 6e 67 20 74 |e called.using t| 000006a0 68 69 73 20 49 2f 4f 20 70 6f 72 74 20 73 79 73 |his I/O port sys| 000006b0 74 65 6d 3b 20 6f 74 68 65 72 20 73 65 72 76 69 |tem; other servi| 000006c0 63 65 73 20 63 61 6e 20 6f 6e 6c 79 20 62 65 20 |ces can only be | 000006d0 63 61 6c 6c 65 64 20 76 69 61 20 74 68 65 20 6e |called via the n| 000006e0 6f 72 6d 61 6c 0a 48 50 43 20 73 79 73 74 65 6d |ormal.HPC system| 000006f0 2e 20 48 6f 77 65 76 65 72 2c 20 74 68 65 20 48 |. 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Open| 00001890 20 61 20 52 49 53 43 20 4f 53 20 66 69 6c 65 2e | a RISC OS file.| 000018a0 20 54 68 69 73 20 69 73 20 61 75 74 6f 6d 61 74 | This is automat| 000018b0 69 63 61 6c 6c 79 20 63 6c 6f 73 65 64 20 77 68 |ically closed wh| 000018c0 65 6e 20 74 68 65 20 50 43 20 69 73 20 73 68 75 |en the PC is shu| 000018d0 74 64 6f 77 6e 0a 20 20 20 20 6f 72 20 72 65 73 |tdown. or res| 000018e0 65 74 2c 20 62 75 74 20 69 74 20 69 73 20 62 65 |et, but it is be| 000018f0 74 74 65 72 20 74 6f 20 63 6c 6f 73 65 20 69 74 |tter to close it| 00001900 20 77 68 65 6e 20 6e 6f 20 6c 6f 6e 67 65 72 20 | when no longer | 00001910 72 65 71 75 69 72 65 64 20 75 73 69 6e 67 0a 20 |required using. | 00001920 20 20 20 48 50 43 5f 41 52 4d 45 44 49 54 5f 43 | HPC_ARMEDIT_C| 00001930 4c 4f 53 45 2e 20 41 20 66 69 6c 65 20 6f 70 65 |LOSE. A file ope| 00001940 6e 65 64 20 75 73 69 6e 67 20 74 68 69 73 20 63 |ned using this c| 00001950 61 6c 6c 20 73 68 6f 75 6c 64 20 6e 6f 74 20 62 |all should not b| 00001960 65 20 63 6c 6f 73 65 64 0a 20 20 20 20 75 73 69 |e closed. usi| 00001970 6e 67 20 52 49 53 43 20 4f 53 20 72 6f 75 74 69 |ng RISC OS routi| 00001980 6e 65 73 20 64 69 72 65 63 74 6c 79 2e 0a 20 20 |nes directly.. | 00001990 20 20 20 20 20 20 0a 20 20 20 20 44 61 74 61 20 | . 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