Home » Personal collection » Acorn ADFS disks » Archimedes » RiscOs_Apps_2.ADF » !65Host/ReadMe
!65Host/ReadMe
This website contains an archive of files for the Acorn Electron, BBC Micro, Acorn Archimedes, Commodore 16 and Commodore 64 computers, which Dominic Ford has rescued from his private collection of floppy disks and cassettes.
Some of these files were originally commercial releases in the 1980s and 1990s, but they are now widely available online. I assume that copyright over them is no longer being asserted. If you own the copyright and would like files to be removed, please contact me.
| Tape/disk: | Home » Personal collection » Acorn ADFS disks » Archimedes » RiscOs_Apps_2.ADF |
| Filename: | !65Host/ReadMe |
| Read OK: | ✔ |
| File size: | 28DC bytes |
| Load address: | FFFFFF41 |
| Exec address: | EACCAB98 |
Duplicates
There is 1 duplicate copy of this file in the archive:
- Personal collection » Acorn ADFS disks » Archimedes » RiscOs_Apps_2.ADF » !65Host/ReadMe
- Personal collection » Acorn ADFS disks » Greaseweazled » adfs_RiscOs_Apps_2.adf » !65Host/ReadMe
File contents
This is 65Host, version 1.40
Documentation on how to use 65Host can be found in Edition 2 of the
Archimedes User Guide.
The following remarks should be noted about this version of 65Host and its
documentation.
65Host provides a limited emulation of a BBC Model B Microcomputer only.
Versions of programs which run on the BBC Master 128 or Master Compact may
use facilities not available on the BBC Model B, and so may not work under
this emulation.
Full emulation of the parallel (Centronics) printer port is provided, via
the Archimedes parallel printer socket. The parallel printer is selected by
default (the selection can be changed using FX 5). Printing is enabled and
disabled in the normal way, usually via CTRL-B and CTRL-C respectively.
No emulation of the serial port, or of the Econet printer interface, is
provided.
The User VIA chip is only accessible to the emulator when an I/O Expansion
Card is present. If a program uses the User VIA timers, it will not operate
correctly without an I/O Expansion Card being fitted.
If an I/O Expansion Card is fitted, then timer interrupts generated from the
6522 may be handled by 6502 programs. However, the timers are driven at
2MHz, rather than the 1MHz on the Model B.
Full sound chip emulation is provided. In conjunction with the 6502
operating system, this allows use of the SOUND and ENVELOPE keywords from
BASIC, and the associated OSWORD calls. This gives the usual 3 tone channels
(square waves) and a noise/pulse wave channel.
Screen accessing has been speeded up since version 1.00.
Keyboard handling has been modified so that characters inserted into the
RISC OS keyboard buffer are later transferred into the 6502 keyboard buffer,
via the normal insert mechanism. This means that programs which use INSV
should now work. Also, OSBYTE calls &79 and &7A, which scan a range of keys,
now work correctly. The pound key now generates the correct code (&60).
However, the keyboard interrupt (which is generated when any keys are
depressed on a selected row) is not supported. There may also be problems
which result from the differing layouts of the Model B and Archimedes
keyboards, especially programs which attempt to do their own SHIFT key
processing (some legends are paired differently on the two keyboards).
The FX 247 mechanism, which allows a 6502 application to intercept reset (ie
the Break key), now works correctly.
Hardware scrolling in MODE 7, followed by a CLS, now works correctly.
Only limited 6845 programming is permitted:-
Registers 0..8 not supported
Register 9 limited support (for implementing modes 0/3, 4/6)
Registers 10,11 supported
Registers 12,13 limited to vertical scrolling of the screen
Registers 14,15 cursor positioning only to resolution of 1 character
There is no emulation of the disc controller. As a consequence,
copy-protected programs or those which attempt direct access to DFS
directory sectors are unlikely to operate correctly.
However, OSWORD &72 (read/write sectors off ADFS) is implemented. The call
gets translated into a call to ADFS_DiscOp. This allows some software
written for the Electron Plus 3 or the Master Compact to work, although
there may be machine differences which cause other problems.
Current limitations: if a disc error occurs, an error is generated, rather
than the error type being returned at offset 0 in the block. OSWORD &73
(Read last error information) is not supported.
The OSARGS call with A=1,Y=0 (Return address of rest of command line) now
functions correctly (both on ARFS and on the emulated DFS (see below)).
The *-commands described in the User Guide (*ListROMs, *SwapROMs, *CacheROM,
*LinkROM, *EmulateBBC) are RISC OS *-commands provided by the emulator
module. *Quit, on the other hand, is provided within the emulated BBC
Microcomputer.
In addition the following *-commands are provided within the emulation:
*Reset [<number>]
Performs a 6502 reset, like CALL !-4.
If number=1, a power-on reset is performed.
*Go [<address>]
Branch the emulated 6502 to the specified address.
*OS
Provide a *-prompt loop within the 6502 emulator.
The paged ROM image 'UtilsROM' provides various extra commands:
*Build, *Dump, *List, *Type perform the same functions as the commands of
the same name provided in the Model B DNFS ROM.
*ROMs lists the loaded paged ROM images.
It also provides a number of commands for controlling sideways RAM (type
*Help SRAM inside the emulator for a list of them). These commands operate
in the same way as on the Master. However, by default, the emulator starts
up with no sideways RAM allocated (the original Model B had no sideways
RAM).
This setup can be changed to that of the Master (four banks of sideways
RAM in sockets 4,5,6 and 7) by editing the !Run file inside the !65Host
application directory (see that file for instructions). Note that this
uses an extra 64K of module workspace (16K for each bank).
Note also that software written for the Master which makes use of sideways
RAM may also make use of other facilities which are available on the Master,
but not on the Model B, eg shadow RAM.
In the emulator the Break key emulates the Break key on the emulated
computer, but the reset button resets Archimedes.
A limited emulation of the disc filing system (DFS) is provided, in order to
allow software to run which assumes DFS file naming conventions (ie
non-hierarchical, single character qualifiers).
Note that this does NOT allow the direct use of 5.25" DFS format floppies,
even with an appropriate disc drive and interface.
Instead it uses the current RISC OS filing system with a translation applied
to the filenames, as follows:-
A DFS name consists of:
drive - one of '0', '1', '2', '3'
qualifier - a single character, default '$'
name - 7 characters long.
This is passed to RISC OS as:
drive, dot, qualifier, name
eg a DFS name of ':2.A.Fred' would be translated to '2.AFred'.
However, certain qualifiers which are allowed on DFS (eg the default '$'),
are reserved characters in RISC OS filenames, so these are substituted by
other characters, as follows:-
'$' is translated into '['
' ' ---------""------- '`'
'@' ---------""------- '<'
'|' ---------""------- '>'
'"' ---------""------- ']'
'%' ---------""------- '}'
'&' ---------""------- '{'
'^' ---------""------- ')'
eg a DFS name of ':1.$.Jim' would be translated to '1.[Jim'.
Typically this would be used by setting up an ADFS disc containing
directories named 0, 1, 2 and 3 and ensuring that their parent is the current
directory when 65Host is started. These are then used as drives by the DFS
emulation. Within each of these directories, a name such as 'CSheila'
represents the DFS file 'C.Sheila'.
All of this is to allow accurate emulation of such DFS commands as *Drive,
*Dir and *Lib. Using the ADFS or Net filing systems directly is often
simpler.
*ADFS and *Net can be used to make the named RISC OS filing systems current.
Alternatively, *ARFS gives access to the current RISC OS filing system.
*Disc selects the DFS emulation, using the current RISC OS filing system.
*Tape is provided (in case an application issues this command), but cannot
load or save files.
Information for software developers
-----------------------------------
An interface has been added to allow 6502 paged ROM images to be developed
which make access to RISC OS SWIs. The SWI is called by executing a
previously undefined 6502 opcode.
6502 Opcode &07 - Issue SWI call
--------------------------------
in: XY (X lo-byte, Y hi-byte) points to control block (cb)
cb?0..2 = SWI number (lo..hi) (bit 17 set => return errors with V set)
cb?3 = number of registers to put back into block on exit, starting at R0
cb?4 = bit set of registers to relocate on entry to SWI
(bit n set => relocate Rn from 6502 to ARM address space)
cb?5 = bit set of registers to unrelocate on exit from SWI
(bit n set => unrelocate Rn from ARM to 6502 address space)
cb?6,7 = address (lo,hi) of error buffer (in 6502 space)
only relevant if bit 17 of SWI number set
cb?8 = length of error buffer (can be zero)
cb!9 = register R0
cb!13 = register R1
..
cb!37 = register R7
out: A,X,Y preserved
N,Z,C,V as returned by the ARM on exit from the SWI
Some or all of the register block is updated with the
values on exit (possibly relocated), as controlled by cb?3,4,5
If bit 17 of the SWI number was clear, and an error occurs, then
control will not returned to the 6502 code - instead the error
block is copied to &100 in 6502 format (ie zero byte, 1 byte error
number, followed by zero terminated error string) and then it jumps
to &100, which causes a BRK. If no error occurred, control will be
returned and V will be clear.
If bit 17 of the SWI number was set, then the X form of the SWI
is issued; if this returns with V set, then the error block is
copied into the specified error buffer in 6502 format, truncated
to the length of the error buffer (if truncated the terminating
zero will be in the last byte of the error buffer).
Support has also been added for selecting a filing system and running a
file, when the emulator is started.
On any reset, system variable 65Host$BootOptions is read.
Bits 2..7, 16..31 are reserved and should be set to 0.
Bits 8..15 contain the number of the filing system to be started up.
0 => default ie ADFS
1 => TAPE (of little use!)
4 => DFS emulation
5 => NET
8 => ADFS
11 => ARFS (ie the current RISC OS filing system)
Bits 0..1 are the boot option (the equivalent of the *OPT 4 setting)
0 => do nothing, 1 => *Load, 2 => *Run, 3 => *Exec
On a power-on reset this boot option is used in conjunction with the
filename specified by the system variable 65Host$BootFile to 'run' a
program.
eg the following sequence enters the emulator, selects the ADFS filing
system and *Runs a file called Game :-
*Set 65Host$BootOptions &802
*Set 65Host$BootFile Game
*EmulateBBC
The !Run file sets up these variables from the rest of the command line
passed to it. The syntax is
*Run !65Host <BootOptions> <BootFile>
eg to load the emulator and perform the above operation, you might do :-
*Run !65Host &802 Game
00000000 54 68 69 73 20 69 73 20 36 35 48 6f 73 74 2c 20 |This is 65Host, |
00000010 76 65 72 73 69 6f 6e 20 31 2e 34 30 0a 0a 44 6f |version 1.40..Do|
00000020 63 75 6d 65 6e 74 61 74 69 6f 6e 20 6f 6e 20 68 |cumentation on h|
00000030 6f 77 20 74 6f 20 75 73 65 20 36 35 48 6f 73 74 |ow to use 65Host|
00000040 20 63 61 6e 20 62 65 20 66 6f 75 6e 64 20 69 6e | can be found in|
00000050 20 45 64 69 74 69 6f 6e 20 32 20 6f 66 20 74 68 | Edition 2 of th|
00000060 65 0a 41 72 63 68 69 6d 65 64 65 73 20 55 73 65 |e.Archimedes Use|
00000070 72 20 47 75 69 64 65 2e 0a 0a 54 68 65 20 66 6f |r Guide...The fo|
00000080 6c 6c 6f 77 69 6e 67 20 72 65 6d 61 72 6b 73 20 |llowing remarks |
00000090 73 68 6f 75 6c 64 20 62 65 20 6e 6f 74 65 64 20 |should be noted |
000000a0 61 62 6f 75 74 20 74 68 69 73 20 76 65 72 73 69 |about this versi|
000000b0 6f 6e 20 6f 66 20 36 35 48 6f 73 74 20 61 6e 64 |on of 65Host and|
000000c0 20 69 74 73 0a 64 6f 63 75 6d 65 6e 74 61 74 69 | its.documentati|
000000d0 6f 6e 2e 0a 0a 36 35 48 6f 73 74 20 70 72 6f 76 |on...65Host prov|
000000e0 69 64 65 73 20 61 20 6c 69 6d 69 74 65 64 20 65 |ides a limited e|
000000f0 6d 75 6c 61 74 69 6f 6e 20 6f 66 20 61 20 42 42 |mulation of a BB|
00000100 43 20 4d 6f 64 65 6c 20 42 20 4d 69 63 72 6f 63 |C Model B Microc|
00000110 6f 6d 70 75 74 65 72 20 6f 6e 6c 79 2e 0a 56 65 |omputer only..Ve|
00000120 72 73 69 6f 6e 73 20 6f 66 20 70 72 6f 67 72 61 |rsions of progra|
00000130 6d 73 20 77 68 69 63 68 20 72 75 6e 20 6f 6e 20 |ms which run on |
00000140 74 68 65 20 42 42 43 20 4d 61 73 74 65 72 20 31 |the BBC Master 1|
00000150 32 38 20 6f 72 20 4d 61 73 74 65 72 20 43 6f 6d |28 or Master Com|
00000160 70 61 63 74 20 6d 61 79 0a 75 73 65 20 66 61 63 |pact may.use fac|
00000170 69 6c 69 74 69 65 73 20 6e 6f 74 20 61 76 61 69 |ilities not avai|
00000180 6c 61 62 6c 65 20 6f 6e 20 74 68 65 20 42 42 43 |lable on the BBC|
00000190 20 4d 6f 64 65 6c 20 42 2c 20 61 6e 64 20 73 6f | Model B, and so|
000001a0 20 6d 61 79 20 6e 6f 74 20 77 6f 72 6b 20 75 6e | may not work un|
000001b0 64 65 72 0a 74 68 69 73 20 65 6d 75 6c 61 74 69 |der.this emulati|
000001c0 6f 6e 2e 0a 0a 46 75 6c 6c 20 65 6d 75 6c 61 74 |on...Full emulat|
000001d0 69 6f 6e 20 6f 66 20 74 68 65 20 70 61 72 61 6c |ion of the paral|
000001e0 6c 65 6c 20 28 43 65 6e 74 72 6f 6e 69 63 73 29 |lel (Centronics)|
000001f0 20 70 72 69 6e 74 65 72 20 70 6f 72 74 20 69 73 | printer port is|
00000200 20 70 72 6f 76 69 64 65 64 2c 20 76 69 61 0a 74 | provided, via.t|
00000210 68 65 20 41 72 63 68 69 6d 65 64 65 73 20 70 61 |he Archimedes pa|
00000220 72 61 6c 6c 65 6c 20 70 72 69 6e 74 65 72 20 73 |rallel printer s|
00000230 6f 63 6b 65 74 2e 20 54 68 65 20 70 61 72 61 6c |ocket. The paral|
00000240 6c 65 6c 20 70 72 69 6e 74 65 72 20 69 73 20 73 |lel printer is s|
00000250 65 6c 65 63 74 65 64 20 62 79 0a 64 65 66 61 75 |elected by.defau|
00000260 6c 74 20 28 74 68 65 20 73 65 6c 65 63 74 69 6f |lt (the selectio|
00000270 6e 20 63 61 6e 20 62 65 20 63 68 61 6e 67 65 64 |n can be changed|
00000280 20 75 73 69 6e 67 20 46 58 20 35 29 2e 20 50 72 | using FX 5). Pr|
00000290 69 6e 74 69 6e 67 20 69 73 20 65 6e 61 62 6c 65 |inting is enable|
000002a0 64 20 61 6e 64 0a 64 69 73 61 62 6c 65 64 20 69 |d and.disabled i|
000002b0 6e 20 74 68 65 20 6e 6f 72 6d 61 6c 20 77 61 79 |n the normal way|
000002c0 2c 20 75 73 75 61 6c 6c 79 20 76 69 61 20 43 54 |, usually via CT|
000002d0 52 4c 2d 42 20 61 6e 64 20 43 54 52 4c 2d 43 20 |RL-B and CTRL-C |
000002e0 72 65 73 70 65 63 74 69 76 65 6c 79 2e 0a 0a 4e |respectively...N|
000002f0 6f 20 65 6d 75 6c 61 74 69 6f 6e 20 6f 66 20 74 |o emulation of t|
00000300 68 65 20 73 65 72 69 61 6c 20 70 6f 72 74 2c 20 |he serial port, |
00000310 6f 72 20 6f 66 20 74 68 65 20 45 63 6f 6e 65 74 |or of the Econet|
00000320 20 70 72 69 6e 74 65 72 20 69 6e 74 65 72 66 61 | printer interfa|
00000330 63 65 2c 20 69 73 0a 70 72 6f 76 69 64 65 64 2e |ce, is.provided.|
00000340 0a 0a 54 68 65 20 55 73 65 72 20 56 49 41 20 63 |..The User VIA c|
00000350 68 69 70 20 69 73 20 6f 6e 6c 79 20 61 63 63 65 |hip is only acce|
00000360 73 73 69 62 6c 65 20 74 6f 20 74 68 65 20 65 6d |ssible to the em|
00000370 75 6c 61 74 6f 72 20 77 68 65 6e 20 61 6e 20 49 |ulator when an I|
00000380 2f 4f 20 45 78 70 61 6e 73 69 6f 6e 0a 43 61 72 |/O Expansion.Car|
00000390 64 20 69 73 20 70 72 65 73 65 6e 74 2e 20 49 66 |d is present. If|
000003a0 20 61 20 70 72 6f 67 72 61 6d 20 75 73 65 73 20 | a program uses |
000003b0 74 68 65 20 55 73 65 72 20 56 49 41 20 74 69 6d |the User VIA tim|
000003c0 65 72 73 2c 20 69 74 20 77 69 6c 6c 20 6e 6f 74 |ers, it will not|
000003d0 20 6f 70 65 72 61 74 65 0a 63 6f 72 72 65 63 74 | operate.correct|
000003e0 6c 79 20 77 69 74 68 6f 75 74 20 61 6e 20 49 2f |ly without an I/|
000003f0 4f 20 45 78 70 61 6e 73 69 6f 6e 20 43 61 72 64 |O Expansion Card|
00000400 20 62 65 69 6e 67 20 66 69 74 74 65 64 2e 0a 0a | being fitted...|
00000410 49 66 20 61 6e 20 49 2f 4f 20 45 78 70 61 6e 73 |If an I/O Expans|
00000420 69 6f 6e 20 43 61 72 64 20 69 73 20 66 69 74 74 |ion Card is fitt|
00000430 65 64 2c 20 74 68 65 6e 20 74 69 6d 65 72 20 69 |ed, then timer i|
00000440 6e 74 65 72 72 75 70 74 73 20 67 65 6e 65 72 61 |nterrupts genera|
00000450 74 65 64 20 66 72 6f 6d 20 74 68 65 0a 36 35 32 |ted from the.652|
00000460 32 20 6d 61 79 20 62 65 20 68 61 6e 64 6c 65 64 |2 may be handled|
00000470 20 62 79 20 36 35 30 32 20 70 72 6f 67 72 61 6d | by 6502 program|
00000480 73 2e 20 48 6f 77 65 76 65 72 2c 20 74 68 65 20 |s. However, the |
00000490 74 69 6d 65 72 73 20 61 72 65 20 64 72 69 76 65 |timers are drive|
000004a0 6e 20 61 74 0a 32 4d 48 7a 2c 20 72 61 74 68 65 |n at.2MHz, rathe|
000004b0 72 20 74 68 61 6e 20 74 68 65 20 31 4d 48 7a 20 |r than the 1MHz |
000004c0 6f 6e 20 74 68 65 20 4d 6f 64 65 6c 20 42 2e 0a |on the Model B..|
000004d0 0a 46 75 6c 6c 20 73 6f 75 6e 64 20 63 68 69 70 |.Full sound chip|
000004e0 20 65 6d 75 6c 61 74 69 6f 6e 20 69 73 20 70 72 | emulation is pr|
000004f0 6f 76 69 64 65 64 2e 20 49 6e 20 63 6f 6e 6a 75 |ovided. In conju|
00000500 6e 63 74 69 6f 6e 20 77 69 74 68 20 74 68 65 20 |nction with the |
00000510 36 35 30 32 0a 6f 70 65 72 61 74 69 6e 67 20 73 |6502.operating s|
00000520 79 73 74 65 6d 2c 20 74 68 69 73 20 61 6c 6c 6f |ystem, this allo|
00000530 77 73 20 75 73 65 20 6f 66 20 74 68 65 20 53 4f |ws use of the SO|
00000540 55 4e 44 20 61 6e 64 20 45 4e 56 45 4c 4f 50 45 |UND and ENVELOPE|
00000550 20 6b 65 79 77 6f 72 64 73 20 66 72 6f 6d 0a 42 | keywords from.B|
00000560 41 53 49 43 2c 20 61 6e 64 20 74 68 65 20 61 73 |ASIC, and the as|
00000570 73 6f 63 69 61 74 65 64 20 4f 53 57 4f 52 44 20 |sociated OSWORD |
00000580 63 61 6c 6c 73 2e 20 54 68 69 73 20 67 69 76 65 |calls. This give|
00000590 73 20 74 68 65 20 75 73 75 61 6c 20 33 20 74 6f |s the usual 3 to|
000005a0 6e 65 20 63 68 61 6e 6e 65 6c 73 0a 28 73 71 75 |ne channels.(squ|
000005b0 61 72 65 20 77 61 76 65 73 29 20 61 6e 64 20 61 |are waves) and a|
000005c0 20 6e 6f 69 73 65 2f 70 75 6c 73 65 20 77 61 76 | noise/pulse wav|
000005d0 65 20 63 68 61 6e 6e 65 6c 2e 0a 0a 53 63 72 65 |e channel...Scre|
000005e0 65 6e 20 61 63 63 65 73 73 69 6e 67 20 68 61 73 |en accessing has|
000005f0 20 62 65 65 6e 20 73 70 65 65 64 65 64 20 75 70 | been speeded up|
00000600 20 73 69 6e 63 65 20 76 65 72 73 69 6f 6e 20 31 | since version 1|
00000610 2e 30 30 2e 0a 0a 4b 65 79 62 6f 61 72 64 20 68 |.00...Keyboard h|
00000620 61 6e 64 6c 69 6e 67 20 68 61 73 20 62 65 65 6e |andling has been|
00000630 20 6d 6f 64 69 66 69 65 64 20 73 6f 20 74 68 61 | modified so tha|
00000640 74 20 63 68 61 72 61 63 74 65 72 73 20 69 6e 73 |t characters ins|
00000650 65 72 74 65 64 20 69 6e 74 6f 20 74 68 65 0a 52 |erted into the.R|
00000660 49 53 43 20 4f 53 20 6b 65 79 62 6f 61 72 64 20 |ISC OS keyboard |
00000670 62 75 66 66 65 72 20 61 72 65 20 6c 61 74 65 72 |buffer are later|
00000680 20 74 72 61 6e 73 66 65 72 72 65 64 20 69 6e 74 | transferred int|
00000690 6f 20 74 68 65 20 36 35 30 32 20 6b 65 79 62 6f |o the 6502 keybo|
000006a0 61 72 64 20 62 75 66 66 65 72 2c 0a 76 69 61 20 |ard buffer,.via |
000006b0 74 68 65 20 6e 6f 72 6d 61 6c 20 69 6e 73 65 72 |the normal inser|
000006c0 74 20 6d 65 63 68 61 6e 69 73 6d 2e 20 54 68 69 |t mechanism. Thi|
000006d0 73 20 6d 65 61 6e 73 20 74 68 61 74 20 70 72 6f |s means that pro|
000006e0 67 72 61 6d 73 20 77 68 69 63 68 20 75 73 65 20 |grams which use |
000006f0 49 4e 53 56 0a 73 68 6f 75 6c 64 20 6e 6f 77 20 |INSV.should now |
00000700 77 6f 72 6b 2e 20 41 6c 73 6f 2c 20 4f 53 42 59 |work. Also, OSBY|
00000710 54 45 20 63 61 6c 6c 73 20 26 37 39 20 61 6e 64 |TE calls &79 and|
00000720 20 26 37 41 2c 20 77 68 69 63 68 20 73 63 61 6e | &7A, which scan|
00000730 20 61 20 72 61 6e 67 65 20 6f 66 20 6b 65 79 73 | a range of keys|
00000740 2c 0a 6e 6f 77 20 77 6f 72 6b 20 63 6f 72 72 65 |,.now work corre|
00000750 63 74 6c 79 2e 20 54 68 65 20 70 6f 75 6e 64 20 |ctly. The pound |
00000760 6b 65 79 20 6e 6f 77 20 67 65 6e 65 72 61 74 65 |key now generate|
00000770 73 20 74 68 65 20 63 6f 72 72 65 63 74 20 63 6f |s the correct co|
00000780 64 65 20 28 26 36 30 29 2e 0a 0a 48 6f 77 65 76 |de (&60)...Howev|
00000790 65 72 2c 20 74 68 65 20 6b 65 79 62 6f 61 72 64 |er, the keyboard|
000007a0 20 69 6e 74 65 72 72 75 70 74 20 28 77 68 69 63 | interrupt (whic|
000007b0 68 20 69 73 20 67 65 6e 65 72 61 74 65 64 20 77 |h is generated w|
000007c0 68 65 6e 20 61 6e 79 20 6b 65 79 73 20 61 72 65 |hen any keys are|
000007d0 0a 64 65 70 72 65 73 73 65 64 20 6f 6e 20 61 20 |.depressed on a |
000007e0 73 65 6c 65 63 74 65 64 20 72 6f 77 29 20 69 73 |selected row) is|
000007f0 20 6e 6f 74 20 73 75 70 70 6f 72 74 65 64 2e 20 | not supported. |
00000800 54 68 65 72 65 20 6d 61 79 20 61 6c 73 6f 20 62 |There may also b|
00000810 65 20 70 72 6f 62 6c 65 6d 73 0a 77 68 69 63 68 |e problems.which|
00000820 20 72 65 73 75 6c 74 20 66 72 6f 6d 20 74 68 65 | result from the|
00000830 20 64 69 66 66 65 72 69 6e 67 20 6c 61 79 6f 75 | differing layou|
00000840 74 73 20 6f 66 20 74 68 65 20 4d 6f 64 65 6c 20 |ts of the Model |
00000850 42 20 61 6e 64 20 41 72 63 68 69 6d 65 64 65 73 |B and Archimedes|
00000860 0a 6b 65 79 62 6f 61 72 64 73 2c 20 65 73 70 65 |.keyboards, espe|
00000870 63 69 61 6c 6c 79 20 70 72 6f 67 72 61 6d 73 20 |cially programs |
00000880 77 68 69 63 68 20 61 74 74 65 6d 70 74 20 74 6f |which attempt to|
00000890 20 64 6f 20 74 68 65 69 72 20 6f 77 6e 20 53 48 | do their own SH|
000008a0 49 46 54 20 6b 65 79 0a 70 72 6f 63 65 73 73 69 |IFT key.processi|
000008b0 6e 67 20 28 73 6f 6d 65 20 6c 65 67 65 6e 64 73 |ng (some legends|
000008c0 20 61 72 65 20 70 61 69 72 65 64 20 64 69 66 66 | are paired diff|
000008d0 65 72 65 6e 74 6c 79 20 6f 6e 20 74 68 65 20 74 |erently on the t|
000008e0 77 6f 20 6b 65 79 62 6f 61 72 64 73 29 2e 0a 0a |wo keyboards)...|
000008f0 54 68 65 20 46 58 20 32 34 37 20 6d 65 63 68 61 |The FX 247 mecha|
00000900 6e 69 73 6d 2c 20 77 68 69 63 68 20 61 6c 6c 6f |nism, which allo|
00000910 77 73 20 61 20 36 35 30 32 20 61 70 70 6c 69 63 |ws a 6502 applic|
00000920 61 74 69 6f 6e 20 74 6f 20 69 6e 74 65 72 63 65 |ation to interce|
00000930 70 74 20 72 65 73 65 74 20 28 69 65 0a 74 68 65 |pt reset (ie.the|
00000940 20 42 72 65 61 6b 20 6b 65 79 29 2c 20 6e 6f 77 | Break key), now|
00000950 20 77 6f 72 6b 73 20 63 6f 72 72 65 63 74 6c 79 | works correctly|
00000960 2e 0a 0a 48 61 72 64 77 61 72 65 20 73 63 72 6f |...Hardware scro|
00000970 6c 6c 69 6e 67 20 69 6e 20 4d 4f 44 45 20 37 2c |lling in MODE 7,|
00000980 20 66 6f 6c 6c 6f 77 65 64 20 62 79 20 61 20 43 | followed by a C|
00000990 4c 53 2c 20 6e 6f 77 20 77 6f 72 6b 73 20 63 6f |LS, now works co|
000009a0 72 72 65 63 74 6c 79 2e 0a 0a 4f 6e 6c 79 20 6c |rrectly...Only l|
000009b0 69 6d 69 74 65 64 20 36 38 34 35 20 70 72 6f 67 |imited 6845 prog|
000009c0 72 61 6d 6d 69 6e 67 20 69 73 20 70 65 72 6d 69 |ramming is permi|
000009d0 74 74 65 64 3a 2d 0a 20 52 65 67 69 73 74 65 72 |tted:-. Register|
000009e0 73 20 30 2e 2e 38 20 20 20 20 20 20 20 20 20 6e |s 0..8 n|
000009f0 6f 74 20 73 75 70 70 6f 72 74 65 64 0a 20 52 65 |ot supported. Re|
00000a00 67 69 73 74 65 72 20 20 39 20 20 20 20 20 20 20 |gister 9 |
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