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README.md
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@ -30,6 +30,7 @@ See this repository: https://git.imzadi.de/acn/backgammon-vt100
* [Blocks](Blocks/)
* [Robots](Robots/)
* [FindThatMine](FindThatMine/)
* [Snake](Snake/)
## More Games on the Interwebs

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# Snake
Snake game for CP/M and VT100/ANSI terminal
* First version (C) 2018, Karl A. Brokstad (www.z80.no)
* Turbo Pascal conversion and other mods with permission (C) 2018, linker3000 (linker3000-at-gmail-dot-com)
Version history:
* V1.2acn: 25-Jun-2020
Changed keys to 2/4/6/8 and H/J/K/L and clear ANSI attributes on exit
* V1.2T: 21-Jul-2019
Corrected Y boundary max in putFood.
* V1.1T: 14-Oct-2018
Command line switch -m (monochrome) suppresses all colour codes
Version numbering detached from Karl A. Brokstad's original
* V23N: 24-Sep-2018 First public release
Game map used for collision detection and food position
generation - this takes out several long loops.
Original GitHub repository: https://github.com/linker3000/Z80-Board
The first version can be found here: https://z80.no/projects/Pascal.html
## License
GPL v2, see the file COPYING
## Instructions
## Compiling
To compile SNAKE, just use Turbo Pascal from the ``TP/`` directory.
It's TP 3.0A for CP/M-80, only without the demo source code.
* Copy the TP files together with the SNAKE.PAS files to one disk
* The terminal definition is already set to ANSI and the speed is set to 8 MHz (for a
standard RC2014), so running TINST is not needed
* Run Turbo Pascal using TURBO
* Set the compiler options to "compile -> Com-file" (press O, C, Q)
* Compile ``SNAKE.PAS``: press C (Compile), then enter ``snake`` as Work file name.
This should result in a ``SNAKE.COM`` file.

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program snake;
{$I- No I/O checking}
{$R- No range checking}
{$V- No string checking}
(*
Snake game for CP/M-80 V2.2 and VTxx/ANSI terminal
Original version (C) 2018, Karl A. Brokstad (www.z80.no)
Turbo Pascal conversion and other mods with permission
(C) 2018, linker3000 (linker3000-at-gmail-dot-com)
V1.2T: 21-Jul 2019
Corrected Y boundary max in putFood.
V1.1T: 14-Oct-2018
Command line switch -m (monochrome) suppresses all colour codes
Version numbering detached from Karl A. Brokstad's original
V23N: 24-Sep-2018 First public release
Game map used for collision detection and food position
generation - this takes out several long loops.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*)
Type
Str255 = string[255];
Const
progVersion : string[6] = '1.2acn';
borderChar : char = '#';
snakeHeadChar : char = 'O';
snakeBodyChar : char = '#';
xMax : Byte = 80;
yMax : Byte = 25;
var
snakeX : array [1..100] of byte;
snakeY : array [1..100] of byte;
gameGrid : array [2..80, 2..25] of byte; {Tracks snake body and tail}
snakeBodyANSI : String[8];
foodANSI : String[8];
snakeHeadANSI : String[8];
borderANSI : String[8];
resetANSI : String[4];
msgANSI : String[8];
snakeHead, snakeTail, snakeLength : integer;
I, level, score : integer;
inp, dir : char;
X, Y : byte;
crash, escaped : boolean;
time : integer; {Game delay factor}
food : boolean;
foodX, foodY, foodV : byte;
(* * * * * * * * * * writeCtr * * * * * * * * * *)
procedure writeCtr(Line : Byte; S : Str255);
{ Write a centered line of text}
Var
I : Integer;
begin
I := 40 - round(Length(S)/2);
If I < 1 then I := 1;
gotoxy(I,Line);
write(S);
end;
(* * * * * * * * * * clrKbd * * * * * * * * * *)
procedure clrKbd; {Clear keyboard buffer}
begin
repeat until (bdos(6,255)) = 0;
end;
(* * * * * * * * * * readKbd * * * * * * * * * *)
procedure readKbd; {Check for direction keys}
begin
if keypressed then case upcase(chr(bdos(6,255))) of
'4','H','A' : dir := 'L'; (* left *)
'8','K','W' : dir := 'U'; (* up *)
'2','J','S' : dir := 'D'; (* down *)
'6','L','D' : dir := 'R'; (* right *)
'+' : time := (time + 5) and 255;
'-' : begin
time := time - 5;
if time < 0 then time := 0;
end;
'Q' : escaped := true;
end;
end;
(* * * * * * * * * conIn * * * * * * * * * * * *)
function conIn : char;
begin
conIn := chr(bdos(6, 255)); (* SILENT READ CHARACTER *)
end;
(* * * * * * * * sDelay * * * * * * * * * * * * * *)
{A non-blocking-ish delay during which we check the keyboard}
procedure sDelay (D : integer);
var I : integer;
begin
for I := 1 to D do
begin
Delay(1);
readKbd;
end;
end;
(* * * * * * * * * SPLASH SCREEN * * * * * * * * * * * *)
procedure SplashScreen;
begin
clrscr;
write (msgANSI);
writeCtr( 4,'SNAKE '+progVersion+' by Linker3000');
writeCtr( 5,'From the original by Karl A. Brokstad (www.Z80.no)');
writeCtr( 7,'This program comes with ABSOLUTELY NO WARRANTY.');
writeCtr( 9,'This is free software, and you are welcome to redistribute it');
writeCtr(10,'under certain conditions - see GPLV2 license:');
writeCtr(11,'https://www.gnu.org/licenses/gpl-2.0.html');
writeCtr(13,'Requirements:');
writeCtr(15,'80x25 ANSI/VT100 compatible console');
if (msgANSI = '') then
writeCtr(16,'(Monochrome mode was chosen by command line switch)')
else
writeCtr(16,'(Start program with -m switch to disable ANSI colors)');
writeCtr(18,'Movement:');
writeCtr(20,'4 = left, 8 = up, 2 = down, 6 = right OR use HJKL keys');
writeCtr(21,'Q = Quit to here during game');
writeCtr(23,'Press ENTER to START or Q to QUIT');
repeat
repeat until keypressed;
inp := conIn;
if ((inp = 'Q') or (inp = 'q')) then
begin
write (resetANSI);
halt;
end;
until (inp = #13);
end;
(* Put down food *)
Procedure putFood;
begin
(* food value 1-9 *)
foodV := 1 + random(9);
repeat {Find a new food location}
readKbd;
foodX := 3 + random(xMax-3); {Stay within walls}
foodY := 3 + random(yMax-4);
until (gameGrid[foodX,foodY] = 0); {Don't put food down over snake}
food := true;
gotoXY(foodX,foodY); {Draw food}
write(foodANSI, foodV ,resetANSI);
gotoXY(1,1);
readKbd;
end; {food}
(* * * * * * * * * DRAW SCREEN * * * * * * * * * * * *)
procedure DrawScreen;
var I : integer;
begin
clrscr;
write(borderANSI);
for I:=1 to xMax do
begin
gotoXY(I,1);
write(borderChar);
gotoXY(I,yMax);
write(borderChar);
end;
for I:=1 to yMax do
begin
gotoXY(1,I);
write(borderChar);
gotoXY(xMax,I);
write(borderChar);
end;
write(resetANSI);
end;
(* * * * * * * * * * * * * * * * * * * * * * *)
(* * * * * * * * * * MAIN * * * * * * * * * * *)
begin
snakeBodyANSI := #27'[40m';
foodANSI := #27'[33;40m'; {Yellow on black background}
snakeHeadANSI := #27'[40m';
borderANSI := #27'[31;44m';
resetANSI := #27'[0m'; {Reset ANSI attributes}
msgANSI := #27'[33;40m';
if (ParamCount > 0) and ((ParamStr(1) = '-m') or (ParamStr(1) = '-M')) then
begin
snakeBodyANSI := '';
foodANSI := '';
snakeHeadANSI := '';
borderANSI := '';
resetANSI := '';
msgANSI := '';
end;
repeat
randomize;
SplashScreen; (* show splash screen *)
(* * * * * * * * * INIT GAME * * * * * * * * *)
escaped := false;
crash := false;
score := 1;
level := 1;
time := 100; (* delay time *)
(* * * * * * * * * GAME LOOP * * * * * * * * *)
while (not escaped) and (not crash) do
begin
{Clear the object location grid}
for Y := 2 to yMax do for X := 2 to xMax do gameGrid[X,Y] := 0;
DrawScreen;
snakeHead := 1; (* first position *)
snakeLength := 1; (* length and last position *)
snakeTail := 2; (* position to erase snakeTail := snakeHead + snakeLength *)
X := 39; (* position in middle of screen *)
Y := 12;
snakeX[snakeLength] := X;
snakeY[snakeLength] := Y;
score := score + snakeLength; (* write level and score *)
gotoXY(30,1);
write(' LEVEL ',level,' SCORE : ',score,' ');
food := false;
for I := 5 downto 0 do
begin
gotoXY(X,Y);
write(I);
delay(500);
end;
dir := 'R';
(* * * * * * * * * START GAME LEVEL * * * * * * * * *)
repeat {Game level}
readKbd; {Check keyboard for input}
case dir of (* MOVE readKbd *)
'L' : X:=X-1; (* left *)
'R' : X:=X+1; (* right *)
'D' : Y:=Y+1; (* down *)
'U' : Y:=Y-1; (* up *)
end;
(* Save snake position *)
(* PUSH snake positions down the line *)
(* Always use full array size to keep processing speed consistent *)
for I := 100 downto 2 do
begin
readKbd; {Check keyboard for input}
snakeX[I] := snakeX[I-1];
snakeY[I] := snakeY[I-1];
end;
snakeX[snakeHead] := X;
snakeY[snakeHead] := Y;
gotoXY(snakeX[snakeHead],snakeY[snakeHead]); (* Draw new head *)
write (snakeHeadANSI,snakeHeadChar);
if snakeLength > 1 then
begin
readKbd;
gotoXY(snakeX[snakeHead+1],snakeY[snakeHead+1]); (* Draw body *)
gameGrid[snakeX[snakeHead+1],snakeY[snakeHead+1]] := 1; {Where the body is}
write (snakeBodyANSI,snakeBodyChar);
end;
gotoXY(snakeX[snakeTail],snakeY[snakeTail]); (* erase tail *)
gameGrid[snakeX[snakeTail],snakeY[snakeTail]] := 0; {Remove tail from map}
write (resetANSI,' ');
gotoXY(1,1);
if (food = false) then putFood; {Put down some food}
{Test snake position}
if (X < 2) or (X >= xMax) {Snake crashes into wall or own body }
or (Y < 2) or (Y >= yMax)
or (gameGrid[X,Y] = 1) then crash := true;
if (X = foodX) and (Y = foodY) then {Snake eats food }
begin
readKbd;
snakeLength := snakeLength + foodV;
food := false;
snakeTail := snakeLength +1;
score := score + (foodV * level);
gotoXY(30,1);
write(' LEVEL ',level,' SCORE : ',score,' ');
gotoXY(1,1);
readKbd;
end;
sDelay(time); (* delay *)
until crash or escaped or (snakeLength > 99); {game level}
(* * * * * * * * * * END GAME * * * * * * * *)
write(msgANSI);
if (crash or escaped) then (* game over *)
if crash then writeCtr(12,' YOU CRASHED ')
else writeCtr(12,' YOU QUIT! ');
if snakeLength > 99 then (* advance to next level *)
begin
level := level + 1;
time := time - 10;
if (time < 1) then time := 1;
writeCtr(12,' YOU MADE IT TO THE NEXT LEVEL ');
end;
write (resetANSI);
clrKbd;
writeCtr(14,' PRESS ENTER ');
repeat until conIn = #13;
end {while}
until false;
(* * * * * * * * * * FINISH * * * * * * * *)
end.


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Welcome to TURBO PASCAL Version 3.0!
------------------------------------
In spite of all efforts, some errors have found their way into
the new TURBO 3.0 manual. This file contains all the necessary
corrections and additions, and we apologize for any inconvenience
this may cause you.
Please make a working copy of your TURBO disk and store the ori-
ginal in a safe place. For help making a backup copy, please
refer to appendix M of the TURBO PASCAL Reference Manual.
NOTEº  Youò  TURBÏ  PASCAÌ disë haó beeî pre-installeä  foò  youò <20>
    Microbeå disë system¬ paù nï attentioî tï thå manuaì witè regardó <20>
    to installing TURBO PASCAL.
*******************************************
* *
* Need help with TURBO? Please see *
* Appendix N in your Reference Manual *
* for answers to common questions. *
* *
*******************************************
-------------------
Contents of the READ.ME File
----------------------------
1. CORRECTIONS to the 3.0 Reference Manual [ All versions ]
2. OMMISSIONS from the 3.0 Reference Manual [ All versions ]
3. New FEATURES [ CP/M-80 ]
4. ADDITIONAL FILE LIST [ CP/M-80 ]
-------------------
CORRECTIONS
-----------
Page 253 - MOV AL,[BP-1]
------------------------
The correct statement is: MOV AL,[BP+4]
Page 293 - TURBO-BCD will compile and run any program
-----------------------------------------------------
Well - almost. The Real functions Sin, Cos, ArcTan, Ln, Exp,
and Sqrt and the pre-declared constant Pi are not available
in TURBOBCD. Š
-------------------
OMISSIONS
---------
User Written Error Handlers
---------------------------
In Turbo Pascal 3.0 you may write your own error handler,
which is called in case of an I/O or Run-time error. The
procedure must have the following header:
procedure Error(ErrNo, ErrAddr: Integer);
The name of the procedure and its parameters are unim-
portant, as long as it is a procedure with two value
parameters of type Integer.
The value passed in ErrNo is the error type and number. The
most significant byte, i.e. "Hi(ErrNo)", contains the error
type, and the least significant byte, i.e. "Lo(ErrNo)",
contains the error number (see Appendix F or G in the Turbo
Pascal Manual).
The following error types are defined:
0 User Break (Ctrl-C).
1 I/O error.
2 Run-time error.
In case of a user interrupt (Ctrl-C), the low byte of
"ErrNo" is always 1. "ErrAddr" contains the address (offset
in Code Segment for 16 bit versions) of the error.
To activate the error handler, assign its offset address
to the standard variable "ErrorPtr", i.e.
ErrorPtr:=Ofs(Error); { 16 bit } or
ErrorPtr:=Addr(Error); { 8 bit }
There are no limits to what an error handler may do. Typi-
cally it will close all open files, output an error mes-
sage, and call the Halt standard procedure to terminate the
program. If an error handler returns, i.e. if it does
not call Halt, or if an error occurs within an error
handler, Turbo Pascal will itself output the error message
and terminate the program.
------------------- Š
NEW FEATURES OF CP/M-80 IMPLEMENTATION OF
TURBO 3.0
- AN OVERVIEW -
-----------------------------------------
Inline
------
A constant identifier used in an INLINE statement does not
always generate two bytes of code.
Files
-----
New FIB formats.
Optional 4th parameter on Blockread/Write returns number of
blocks actually read.
SeekEoln function.
SeekEof function.
Misc.
-----
Exit procedure - To exit the current block
OvrDrive procedure - To specify the drive on which to find overlays
ParamCount function - Gives number of characters in the command buffer
ParamStr function - Gives the string of characters in the command line
Overlays
--------
Overlay files are opened and closed every time they are
accessed. Therefore, there is never a need to specifically
close an overlay file.
The Y compiler directive is no longer supported. Instead,
the OvrPath (MS-DOS) or OvrDrive (CP/M) standard proce-
dures may be used to specify the drive and subdirectory
in which overlay files reside.
Please note that run-time error F0 indicates that your over-
lay file is missing or is called recursively. (This error
number is omitted from the Reference Manual but is included
elsewhere in this file.)
-------------------
TURBO PASCAL Version 3.0
CP/M-80
Additional File List
In addition to the list of files mentioned in Chapter 1 of
your TURBO Reference Manual, the following files are included
on your TURBO disk: Š
Sample programs
---------------
LISTER PAS - simple program to list your Pascal source
CMDLIN PAS - get parameters from the command line
MC PAS - sample spreadsheet program - MAIN MODULE
MC-MOD00 INC - sample spreadsheet program - INCLUDE MODULE 00
MC-MOD01 INC - sample spreadsheet program - INCLUDE MODULE 01
MC-MOD02 INC - sample spreadsheet program - INCLUDE MODULE 02
MC-MOD03 INC - sample spreadsheet program - INCLUDE MODULE 03
MC-MOD04 INC - sample spreadsheet program - INCLUDE MODULE 04
MC-MOD05 INC - sample spreadsheet program - INCLUDE MODULE 05
MC HLP - spreadsheet help file
MCDEMO MCS - spreadsheet data file (not for use with TURBO-87)
---------------------------------------------------------------------


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1 TURBO Pascal installation menu.
2 Choose installation item from the following:
3
4 [S]creen installation | [C]ommand installation | [Q]uit
5
6 Enter S, C, or Q:
10 Duplicate definition. Error occurred between question
11 Commands starting with the same letter must have the same length.
Error occurred between question
12 The total maximum length of commands are execeeded
13 ->
14 CURSOR MOVEMENTS:
20 Character left
21 Alternative
22 Character right
23 Word left
24 Word right
25 Line up
26 Line down
27 Scroll down
28 Scroll up
29 Page up
30 Page down
31 To left on line
32 To right on line
33 To top of page
34 To bottom of page
35 To top of file
36 To end of file
37 To begining of block
38 To end of block
39 To last cursor position
15 INSERT & DELETE:
40 Insert mode on/off
41 Insert line
42 Delete line
43 Delete to end of line
44 Delete right word
45 Delete character under cursor
46 Delete left character
47 Alternative
16 BLOCK COMMANDS:
48 Mark block begin
49 Mark block end
50 Mark single word
51 Hide/display block
52 Copy block
53 Move block
54 Delete block
55 Read block from disk
56 Write block to disk
17 MISC. EDITING COMMANDS:
57 End edit
58 Tab
59 Auto tab on/off
60 Restore line
61 Find
62 Find & replace
63 Repeat last find
64 Control character prefix
101 Nothing
^Q: Quit, ^R: Last page, ^C: Next page, <RETURN>: Select terminal:
Wait Sorting Definitions
Change to:
(Y/N)?
y
n
Text file name:
Command:
Numeric entry expected
Legal range is
, please re-enter:
Choose one of the following terminals:
None of the above ( Max. 20 Characters )
Delete a definition ( Max. 20 Characters )
Which terminal? (Enter no. or ^Q to exit):
Delete terminal? (Enter no. or ^Q to exit):
Do you want to modify this definition before installation?
Terminal type:
Send an initialization string to the terminal?
Initializaion defined as a command string? (No = a file)
Send a reset string to the terminal
Reset defined as a command? (No = a file)
CURSOR LEAD-IN command:
CURSOR POSITIONING COMMAND to send between line and column:
CURSOR POSITIONING COMMAND to send after both line and column:
Column first
OFFSET to add to LINE:
OFFSET to add to COLUMN:
Binary address
Number of ASCII digits (2 or 3):
CLEAR SCREEN command:
Does CLEAR SCREEN also HOME cursor
HOME command:
DELETE LINE command:
INSERT LINE command:
ERASE TO END OF LINE command:
START HIGHLIGHTING command:
END HIGHLIGHTING command:
Number of rows (lines) on your screen:
Number of columns on your screen:
Delay after CURSOR ADDRESS (0-255 ms):
Delay after CLEAR, DELETE and INSERT (0-255 ms):
Delay after ERASE TO END OF LINE and HIGHLIGHT (0-255 ms):
Is this definition correct?
Hardware dependent information
Operating frequency of your microprocessor in MHz (for delays):
pendent information
Operating frequency of your microprocessor in MHz (for delays):


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 are not allowed
 can not be
 constant
 does not
 expression
 identifier
 file
 here
Integer
File
Illegal
 or
Undefined
 match
 real
String
Textfile
 out of range
 variable
 overflow
 expected
 type
Invalid
 pointer
01';'
02':'
03','
04'('
05')'
06'='
07':='
08'['
09']'
10'.'
11'..'
12BEGIN
13DO
14END
15OF
17THEN
18TO DOWNTO
20Boolean
21 
22 
23 
24 
25 
26 
27 
28Pointer
29Record
30Simple
31Simple
32
33
34
35
36Type
37Untyped
40 label
41Unknown syntax error
42 in preceding definitions
43Duplicate label
44Type mismatch
45
46 and CASE selector
47Operand(s) operator
48 result
49  length
50 length
51 subrange base
52Lower bound > upper bound
53Reserved word
54 assignment
55 exceeds line
56Error in integer
57Error in
58 character in
60s
61 s ands
62Structureds
63s
64s and untypeds
65Untypeds
66I/O
67 s must be parameters
68 componentss
69dering of fields
70Set base
71 GOTO
72Label not within current block
73 FORWARD procedure(s)
74INLINE error
75 use of ABSOLUTE
90 not found
91Unexpected end of source
97Too many nested WITH's
98Memory
99Compilerd WITH's
98Memory
99Compiler

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