Add input status register to the emulator
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da67a19ac6
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48
emulator.pas
48
emulator.pas
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@ -8,9 +8,10 @@ program Emulator;
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{$define tape}
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{$define floppy}
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{$define modem}
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{$define status}
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{$endif}
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uses SysUtils, Crt{$ifdef modem}, Sockets{$endif};
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uses SysUtils, Crt{$ifdef modem}, Sockets{$endif}{$ifdef status}, BaseUnix{$endif};
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type
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{$ifdef tape}
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@ -70,7 +71,7 @@ var
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{$endif}
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Ch, Scan: ansichar; //Character for input and output and scancode for non-ASCII keys
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Verbose, IC, LFX: integer; //Verbose flag, instruction counter for CPU speed, and line feed position marker
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Fetched{$ifdef floppy}, Disc0Track, Disc1Track, Disc0Sect, Disc1Sect{$endif}: byte; //Fetched byte, and disc drive locations
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Fetched{$ifdef floppy}, Disc0Track, Disc1Track, Disc0Sect, Disc1Sect{$endif}: byte; //Fetched byte and disc drive locations
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{$ifdef floppy}
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DiscDrive: 0 .. 1; //Current disc drive number
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{$endif}
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@ -80,6 +81,9 @@ var
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ServerSocket: longint; //Server socket
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ServerAddr: TInetSockAddr; //Server address
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{$endif}
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{$ifdef status}
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FileDescs: TFDset; //File descriptor set
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{$endif}
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//Terminal output
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procedure Output;
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@ -266,6 +270,46 @@ begin
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else B := 0;
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end
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{$endif}
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{$ifdef status}
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//Input status register
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else if W = $fff8 then begin
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{$ifndef fast}
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wait (1);
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{$endif}
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//Initialise the register
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B := 0;
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//FFFF: Terminal
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fpfd_zero (FileDescs);
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fpfd_set (0, FileDescs);
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if fpSelect (1, @FileDescs, nil, nil, 1) > 0 then B := B or 1;
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//FFFE: No input
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B := B or 2;
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//FFFD: Tape reader or no input
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B := B or 4;
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//FFFC: Disc system data or no input
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B := B or 8;
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//FFFB: No input
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B := B or $10;
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//FFFA: Modem or no input
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{$ifdef modem}
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//Connect
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CallServer;
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//Check the connection
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if Calling then begin
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fpfd_zero (FileDescs);
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fpfd_set (ServerSocket, FileDescs);
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if fpSelect (ServerSocket + 1, @FileDescs, nil, nil, 0) > 0 then B := B or $20;
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end;
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{$endif}
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{$ifndef modem}
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B := B or $20;
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{$endif}
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//FFF9: No input
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B := B or $40;
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//FFF8: Input status register
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B := B or $80;
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end
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{$endif}
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//Unused addresses
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else if W > LastRAM then B := 0
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//Regular load
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38
readme.md
38
readme.md
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@ -120,22 +120,23 @@ characters and non-character keys null.
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In Linux the emulator can be compiled with support for a character
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printer, an emulated high speed (roughly 500 CPS in and 50 CPS out)
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8-bit paper tape reader and punch, an emulated two-drive 8" floppy disc
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system, and a roughly 300 b/s modem with the arguments -dprinter,
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-dtape, -dfloppy, and -dmodem respectively. Full 64 KiB of RAM and all
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of these options can also be enabled with the argument -dfull. The
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printer is mapped to address FFFE, the tape reader and punch to FFFD,
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the disc system to FFFB and FFFC, and the modem to FFFA. The printer
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prints into /dev/usb/lp0. The tape files read from and punched to are
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(re)set using the program tapectl with the arguments -r and -p
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respectively and the disc files in drives 0 and 1 using the program
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floppyctl with the arguments -0 and -1 respectively. The disc system
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uses hard sectored single-sided discs with 77 tracks of 32 sectors of
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137 bytes, or 337568 bytes in total: the disc files must be of this
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size. The modem is controlled by the program modemctl: the option -c is
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used to "call" an IP address and port, -a to set the modem ready for
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"answering" "calls" to port 1337, and -h to "hang". "Hanging" manually
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is not necessary when "calling" a different address or switching between
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"calling" and "answering". Note: "Answering" is not functional yet.
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system, a roughly 300 b/s modem, and an input status register with the
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arguments -dprinter, -dtape, -dfloppy, -dmodem, and -dstatus
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respectively. Full 64 KiB of RAM and all of these options can also be
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enabled with the argument -dfull. The printer is mapped to address FFFE,
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the tape reader and punch to FFFD, the disc system to FFFB and FFFC, the
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modem to FFFA, and the input status register to FFF8. The printer prints
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into /dev/usb/lp0. The tape files read from and punched to are (re)set
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using the program tapectl with the arguments -r and -p respectively and
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the disc files in drives 0 and 1 using the program floppyctl with the
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arguments -0 and -1 respectively. The disc system uses hard sectored
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single-sided discs with 77 tracks of 32 sectors of 137 bytes, or 337568
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bytes in total: the disc files must be of this size. The modem is
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controlled by the program modemctl: the option -c is used to call an IP
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address and port, -a to set the modem ready for answering calls to port
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1337, and -h to hang. Hanging manually is not necessary when making a
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new call or switching between calling and answering. Note: Answering is
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not implemented yet.
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The floppy disc system uses two ports: command at FFFB and data at FFFC.
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Only the low nibble of the command port is used, consisting of a
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@ -157,6 +158,11 @@ The commands for the disc system are:
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6: Read a sector from a disc to the buffer.
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7: Write a sector from the buffer to a disc.
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The input status register can be used to check if a device is ready to
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be read from. The reserved addresses FFF8-FFFF are mapped to the bits
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7-0: a set bit means either that the device is ready or that no input
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device is mapped to the address in question.
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The IPL loads the program specified as an argument when running the
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emulator.
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