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Thingamajig
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Add verbose function to the emulator and correct some terminology in and reword the readme slightly

This commit is contained in:
CrazyEttin 2022-08-24 14:40:41 +03:00
parent 582c13630c
commit 06f4c731c3
2 changed files with 34 additions and 12 deletions
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36
emulator.pas
View File

@ -18,8 +18,8 @@ const
IO = $ffff;
var
Hlt, ASCII: boolean; //Halt and ASCII flags
Op: 0 .. $f; //Opcode
Hlt, ASCII, Verbose: boolean; //Halt, ASCII, and verbose flags
Op, Regs: 0 .. $f; //Opcode
X, Y: 0 .. 3; //Register arguments
Addr, IP, RP: word; //Address argument and instruction and return pointers
R: array [0 .. 3] of byte; //General-purpose registers
@ -78,13 +78,30 @@ begin
Punch.Pos := 0;
{$endif}
//Read a program file and check for errors
if ParamCount <> 1 then begin
writeln ('Usage: emulator program');
//Check the arguments
if ParamCount = 0 then begin
writeln ('Usage: emulator (-v) program (2> verbose_output)');
halt;
end;
if ParamStr (1) = '-v' then begin
Verbose := true;
if ParamCount <> 2 then begin
writeln ('Usage: emulator (-v) program (2> verbose_output)');
halt;
end;
end
else begin
Verbose := false;
if ParamCount <> 1 then begin
writeln ('Usage: emulator (-v) program (2> verbose_output)');
halt;
end;
end;
//Read a program file and check for errors
{$i-}
assign (Prog, ParamStr (1));
if Verbose = true then assign (Prog, ParamStr (2))
else assign (Prog, ParamStr (1));
reset (Prog);
{$i+}
if IOResult <> 0 then begin
@ -106,10 +123,14 @@ begin
//Begin the main loop
while Hlt = false do begin
//Print the CPU state to StdErr
if Verbose = true then writeln (StdErr, 'IR: ', IntToHex (Op, 1), IntToHex (Regs, 1), IntToHex (Addr, 4), '; IP: ', IntToHex (IP, 4), ', RP: ', IntToHex (RP, 4), '; R0: ', IntToHex (R[0], 2), ', R1: ', IntToHex (R[1], 2), ', R2: ', IntToHex (R[2], 2), ', R3: ', IntToHex (R[3], 2), ansichar ($d));
//Fetch the instruction and increment the instruction pointer
//Opcode
Op := Mem [IP] and $f0 shr 4;
//Register arguments
Regs := Mem [IP] and $f;
X := Mem [IP] and $c shr 2;
Y := Mem [IP] and 3;
IP := IP + 1;
@ -134,7 +155,8 @@ begin
writeln ('Error: illegal instruction pointer value');
halt;
end;
end;
end
else Addr := 0;
//Decode and execute the instruction
//Halt

10
readme.md
View File

@ -17,7 +17,7 @@ Assembly.
Speed
-----
Thingamajig does not have a prescribed speed. The emulator should run at
Thingamajig does not have a prescribed speed. The emulator runs at
roughly 500 KIPS.
Registers and Memory
@ -92,13 +92,13 @@ reference to or relative to a label.
Memory-Mapped Devices
---------------------
Input and output are mapped to address FFFF. The emulator emulates a
glass teletype with local echo.
Input and output are mapped to address FFFF; the emulator emulates a
roughly 1000 CPS glass teletype with local echo.
Arbitrary devices can be mapped to the other reserved addresses.
In Linux the emulator can be compiled with support for a line printer
and an emulated punched tape reader and punch with the arguments
In Linux the emulator can be compiled with support for a character
printer and an emulated punched tape reader and punch with the arguments
-dprinter and -dtape respectively. The printer is mapped to address FFFE
and the tape reader and punch to FFFD. The printer prints into
/dev/usb/lp0 and the tape files read from and punched to are (re)set