Updated information about VT100 factory defaults
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Jeff Parsons
parent
f67535c1aa
commit
6410ae068c
3 changed files with 113 additions and 73 deletions
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@ -501,32 +501,47 @@ ChipSet8080.VT100.INIT = [
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0, 0, 0, 0,
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[
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/*
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* The following table contains the data we use to initialize all (100) words of NVR (Non-Volatile RAM).
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* According the DEC Technical Manual:
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* The following array contains the data we use to initialize all (100) words of NVR (Non-Volatile RAM).
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*
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* I used to initialize every word to 0x3ff, as if the NVR had been freshly erased, but that causes the
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* firmware to (attempt to) beep and then display an error code (2). As the DEC Technical Manual says:
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*
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* If the NVR fails, the bell sounds several times to inform the operator, and then default settings
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* stored in the ROM allow the terminal to work.
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*
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* However, this behavior may be limited to only certain kinds of "failures", because if I deliberately
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* stuff an invalid value in the table, there is indeed an attempt to beep (though sound isn't working yet),
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* an error code (2) is displayed in the top-left corner of the screen, but the NVR still appears to contain
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* all the same (invalid) data we started with. Perhaps all they meant to say is that the RAM copy of NVR
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* settings is reset, not the NVR itself.
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* but I think what they meant to say is that default settings are stored in the RAM copy of NVR. So then
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* I went into SET-UP, pressed SHIFT-S to save those settings back to NVR, and then used the PC8080 debugger
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* "d nvr" command to dump the NVR contents. The results are below.
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*
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* Using a VT100 configuration with the Debugger attached, use the NVR dumper command ("d nvr") to see how
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* other SET-UP changes affect the NVR (after you've saved your changes using SHIFT-S, of course).
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* The first dump actually contains only two modifications to the factory defaults: enabling ONLINE instead
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* of LOCAL operation, and turning ANSI support ON. The second dump is unmodified (the TRUE factory defaults).
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*
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* NVR Notes
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* ---------
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* After enabling smooth scrolling, the word in row 5, col 4 changes from 2E50 to 2ED0, and the final word
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* changes from 2E51 to 2E71 (I'm guessing that the final word is an NVR checksum).
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* By making selective changes, you can discern where the bits for certain features are stored. For example,
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* smooth-scrolling is apparently controlled by bit 7 of the word at offset 0x2B (and is ON by default in
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* the factory settings). And it's likely that the word at offset 0x32 (ie, the last word that's not zero)
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* is the NVR checksum.
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*/
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0x2E80, 0x2E80, 0x2E80, 0x2E80, 0x2E80, 0x2E80, 0x2E80, 0x2E80, 0x2E80, 0x2E80,
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0x2E80, 0x2E80, 0x2E80, 0x2E80, 0x2E80, 0x2E80, 0x2E80, 0x2E80, 0x2E80, 0x2E80,
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0x2E80, 0x2E80, 0x2E80, 0x2E80, 0x2E80, 0x2E80, 0x2E80, 0x2E80, 0x2E80, 0x2E80,
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0x2E80, 0x2E80, 0x2E80, 0x2E80, 0x2E80, 0x2E80, 0x2E80, 0x2E80, 0x2E80, 0x2E00,
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0x2E08, 0x2E8E, 0x2E00, 0x2ED0, 0x2E30, 0x2E40, 0x2E20, 0x2E00, 0x2EE0, 0x2EE0,
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0x2E71, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
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0x2E08, 0x2E8E, 0x2E00, 0x2ED0, 0x2E70, 0x2E00, 0x2E20, 0x2E00, 0x2EE0, 0x2EE0,
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0x2E7D, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
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0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
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0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
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0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
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0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000
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],
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[
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/*
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* The TRUE factory defaults (not currently used for anything; they're just here for reference, wasting space....)
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*/
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0x2E80, 0x2E80, 0x2E80, 0x2E80, 0x2E80, 0x2E80, 0x2E80, 0x2E80, 0x2E80, 0x2E80,
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0x2E80, 0x2E80, 0x2E80, 0x2E80, 0x2E80, 0x2E80, 0x2E80, 0x2E80, 0x2E80, 0x2E80,
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0x2E80, 0x2E80, 0x2E80, 0x2E80, 0x2E80, 0x2E80, 0x2E80, 0x2E80, 0x2E80, 0x2E80,
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0x2E80, 0x2E80, 0x2E80, 0x2E80, 0x2E80, 0x2E80, 0x2E80, 0x2E80, 0x2E80, 0x2E00,
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0x2E08, 0x2E8E, 0x2E20, 0x2ED0, 0x2E50, 0x2E00, 0x2E20, 0x2E00, 0x2EE0, 0x2EE0,
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0x2E69, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
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0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
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0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
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0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
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@ -380,6 +380,58 @@ SerialPort8080.prototype.setBinding = function(sHTMLType, sBinding, control, sVa
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return false;
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};
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/**
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* echoByte(b)
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*
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* @this {SerialPort8080}
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* @param {number} b
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* @return {boolean} true if echo, false if not
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*/
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SerialPort8080.prototype.echoByte = function(b)
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{
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var fEchoed = false;
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if (this.controlIOBuffer) {
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if (b == 0x08) {
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this.controlIOBuffer.value = this.controlIOBuffer.value.slice(0, -1);
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/*
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* TODO: Back up the correct number of columns if the character erased was a tab.
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*/
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if (this.iLogicalCol > 0) this.iLogicalCol--;
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}
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else {
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var s = str.toASCIICode(b);
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var nChars = s.length;
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if (b == 0x09) {
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var tabSize = this.tabSize || 8;
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nChars = tabSize - (this.iLogicalCol % tabSize);
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if (this.tabSize) s = str.pad("", nChars);
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}
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else if (b == 0x0D) {
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this.iLogicalCol = nChars = 0;
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s = "\n";
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}
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if (this.charBOL && !this.iLogicalCol && nChars) s = String.fromCharCode(this.charBOL) + s;
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this.controlIOBuffer.value += s;
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this.controlIOBuffer.scrollTop = this.controlIOBuffer.scrollHeight;
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this.iLogicalCol += nChars;
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}
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fEchoed = true;
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}
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else if (this.consoleOutput != null) {
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if (b == 0x0A || this.consoleOutput.length >= 1024) {
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this.println(this.consoleOutput);
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this.consoleOutput = "";
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}
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if (b != 0x0A) {
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this.consoleOutput += String.fromCharCode(b);
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}
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fEchoed = true;
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}
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return fEchoed;
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};
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/**
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* initBus(cmp, bus, cpu, dbg)
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*
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@ -616,6 +668,7 @@ SerialPort8080.prototype.getBaudTimeout = function(maskRate)
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*/
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SerialPort8080.prototype.receiveByte = function(b)
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{
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if (MAXDEBUG) this.echoByte(b);
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this.printMessage("receiveByte(" + str.toHexByte(b) + "), status=" + str.toHexByte(this.bStatus));
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if (!this.fAutoStop && !(this.bStatus & SerialPort8080.UART8251.STATUS.RECV_FULL)) {
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this.bDataIn = b;
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@ -689,41 +742,7 @@ SerialPort8080.prototype.transmitByte = function(b)
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}
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}
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if (this.controlIOBuffer) {
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if (b == 0x08) {
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this.controlIOBuffer.value = this.controlIOBuffer.value.slice(0, -1);
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/*
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* TODO: Back up the correct number of columns if the character erased was a tab.
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*/
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if (this.iLogicalCol > 0) this.iLogicalCol--;
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}
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else {
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var s = str.toASCIICode(b);
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var nChars = s.length;
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if (b == 0x09) {
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var tabSize = this.tabSize || 8;
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nChars = tabSize - (this.iLogicalCol % tabSize);
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if (this.tabSize) s = str.pad("", nChars);
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}
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else if (b == 0x0D) {
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this.iLogicalCol = nChars = 0;
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s = "\n";
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}
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if (this.charBOL && !this.iLogicalCol && nChars) s = String.fromCharCode(this.charBOL) + s;
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this.controlIOBuffer.value += s;
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this.controlIOBuffer.scrollTop = this.controlIOBuffer.scrollHeight;
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this.iLogicalCol += nChars;
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}
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fTransmitted = true;
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}
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else if (this.consoleOutput != null) {
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if (b == 0x0A || this.consoleOutput.length >= 1024) {
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this.println(this.consoleOutput);
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this.consoleOutput = "";
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}
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if (b != 0x0A) {
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this.consoleOutput += String.fromCharCode(b);
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}
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if (this.echoByte(b)) {
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fTransmitted = true;
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}
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