Skip to content

Tweeks to teletype emulation and testing on various browsers. #3

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Open
wants to merge 2 commits into
base: master
Choose a base branch
from
Open

Tweeks to teletype emulation and testing on various browsers. #3

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
2 commits
Select commit Hold shift + click to select a range
a1147b6
Merge pull request #1 from pavel-krivanek/master
jgharston Aug 21, 2023
8a52d66
Tweeks and testing teletype emulation
jgharston Oct 4, 2023
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
1 change: 1 addition & 0 deletions src/cons.js
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -94,6 +94,7 @@ conswrite16(a,v)
case 13: break;
default:
writeterminal(String.fromCharCode(v & 0x7F));
// writeterminal(String.fromCharCode(v & 0xFF));
}
TPS &= 0xff7f;
if(TPS & (1<<6))
Expand Down
100 changes: 65 additions & 35 deletions src/teletype.js
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -1,10 +1,19 @@
// Updates by JGH, Apr-2021
// CHR$127 ignored, CHR$8 backspace, CHR$9 TABs expand option
// single-spaced lines, >CHR$96 forced to upper case, CHR$96=UKP
// CHR$95 prints underline using half-spaced hyphen, CHR$12 formfeeds
// BS, TAB, ESC, Ctrl-Letter return keypresses
// BUGS: Firefox: prevents Ctrl-N, Ctrl-T, Ctrl-W, impossible to prevent this
// Chrome: almost all CHR$<32 intercepted by browser, including ESC and BS
// SeaMonkey: returns all control characters

"use strict";
var typingSpeed = 50;
var typingSpeed = 50; // 10cs
const bell_width = 72 - 5;
const max_width = 72 - 1;
const tab_width = 8;
const xpx = 12; // characters width/heigth
const ypx = 30;
const ypx = 18; // was 30
const char_height = 20;
const margin_top = 40;
const margin_left = 90;
Expand Down Expand Up @@ -62,44 +71,49 @@ function advance_one_space() {

function keypress(e) {

// Prevent browser special key actions as long as ctrl/alt/cmd is not being held
if (!e.altKey && !e.ctrlKey && !e.metaKey) {
var charCode = e.charCode;

// Prevent browser special key actions as long as alt/cmd is not being held
if (!e.altKey && !e.metaKey) {
e.preventDefault();
e.stopPropagation();
}

if (e.ctrlKey) {
if ((charCode & 64) == 64) charCode = charCode & 31;
if (charCode == 39) charCode = 0;
if (charCode == 54) charCode = 30;
if (charCode == 45) charCode = 31;
}

// Don't handle keys that are handled by keydown functions
if (e.charCode == 0) {
if (charCode == 0) {
// Note the use of keyCode here so these numbers will match the keydown ones
switch (e.keyCode) {
case 8:
case 9:
case 13:
case 37:
case 38:
case 39:
case 40:
case 16:
case 18:
case 20:
case 27:
case 17:
case 224:
charCode=e.keyCode; break;
otherwise:
return false;
}
}

// Record the keypress for mutex purposes, even if we're not going to act on it
keypress_keys[keydown_keycode] = 1; // Have to use charCode as that's the only one available to both keypress and keyup
if (charCode != 27) {
keypress_keys[keydown_keycode] = 1; // Have to use charCode as that's the only one available to both keypress and keyup
}

// Only one printing keypress allowed at a time
if (Object.keys(keypress_keys).length > 1) {
return false;
}

if ((e.charCode != 10) && (e.charCode != 13)) {
addchar(e.charCode);
specialchar(e.charCode);
}
// if ((charCode != 10) && (charCode != 13)) {
addchar(charCode);
// specialchar(charCode);
// }
}

function typeCharacter(charCode, shiftKey) {
Expand All @@ -121,21 +135,29 @@ function printer() {
function typeCharacterImmediately(charCode, shiftKey) {
var nosound = false;

if (charCode == 13) return; // ignore
if (charCode == 0) return; // ignore
if (charCode == 127) charCode=8;
if (charCode == 13) x = 0;
if (charCode == 9) charCode=32; // Don't expand TABs, comment out to expand
if (charCode == 8) if (x > 0) x -= xpx;
if (charCode == 0) return; // ignore
if (charCode == 10) {
crlf();
move_page();
}
// if (charCode == 12) {
// crlf(); move_page();
// crlf(); move_page();
// crlf(); move_page();
// crlf(); move_page();
// }

if (charCode != 32 && charCode != 127 && !((charCode === 10) || (charCode === 13)))
$("#cursorImage").attr("src", "head2.png");

var c;
if (charCode > 96) charCode = charCode & 95;
c = String.fromCharCode(charCode);

if (charCode == 127) c = " ";

// Vertical offset
if (!(c in voffset)) {
voffset[c] = {
Expand All @@ -145,16 +167,21 @@ function typeCharacterImmediately(charCode, shiftKey) {
}

let this_voffset = (voffset[c].threshold <= brokenness) ? Math.round(voffset[c].direction * brokenness / 33) : 0;
if (charCode == 95) {
this_voffset += ypx/2;
c = "-";
}
// output_character(c, this_voffset, '.output');

output_character(c, this_voffset, '.output');

if (charCode != 10) {
if (charCode > 31) {
output_character(c, this_voffset, '.output');
advance_one_space();
}
if (charCode == 127) {
advance_one_space();
if (charCode == 9) { // Expand TABs
advance_one_space();
while (((x/xpx) & 7) && ((x / xpx) < max_width)) {
advance_one_space();
}
}

if (c.match(/\S/)) {
Expand All @@ -165,6 +192,9 @@ function typeCharacterImmediately(charCode, shiftKey) {
$.ionSound.play('bell');
} else if (!nosound) {
switch (charCode) {
case 8:
case 9:
case 10:
case 32:
case 127:
$.ionSound.play('type-space');
Expand All @@ -177,7 +207,7 @@ function typeCharacterImmediately(charCode, shiftKey) {
setCursorPosition();

setTimeout(function() {
if (charCode != 32 && charCode != 9) {
if (charCode > 32 || charCode == 8) {
switch (spoolPosition) {
case 1:
headImage = "head.png";
Expand All @@ -196,7 +226,7 @@ function typeCharacterImmediately(charCode, shiftKey) {
}

function output_character(aCharacter, this_voffset, where) {
let c = aCharacter.toUpperCase();
let c = aCharacter;
// Choose an alpha level with a random element to simulate uneven key pressure and ribbon ink
var ink_level = (ink_remaining > 0) ? ink_remaining / 400 - ink_variation + Math.random() * ink_variation : 0;

Expand Down Expand Up @@ -240,17 +270,17 @@ function keydown_nonmod(e) {
}
switch (e.which) {
case 9: // tab
// odd, why no semicolons?
if (e.charCode == 0) {
e.preventDefault();

e.preventDefault()
specialchar(9)
}
break;
case 13: // enter
addchar(13);
specialchar(13);
break;
// case 13: // enter
// addchar(13);
// specialchar(13);
// break;
case 46: // del
if (e.charCode == 0) {
e.preventDefault();
Expand Down