document.write(`
	 	

	
	<table style="width: 1026px; ">
		<tr>
			<td >
				<h1>the virtual data center<br />
				a fully working walkable<br />
				1401 3D simulation<small><i> - for free</i></small></h1>
			</td>
			<td >
				<img alt="t" longdesc="t" src="pic/view1.jpg" width="400"/>
			</td>
		</tr>
	</table>
	
	<br />
	<div class="boxed boxed_wide">literature</div>
	<br />

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recommended text books for the start.<br>local copies; originals are from bitsavers.org 
or ibm-1401.info, see -alt- link<br />
<br />

<table style="width: 1032px; height: 314px;" cellspacing="0">
	<tr>
		<td style="width: 634px; height: 94px;" ><i>for an introduction to the concept:</i><br><a href="https://rolffson.de/1401/bitsavers_doc/Programming_the_1401_1962.pdf">Programming the 1401 (1962)</a></td>
		<td style="width: 105px; height: 94px;" ><br />
		<a href="http://bitsavers.org/pdf/ibm/1401/Programming_the_1401_1962.pdf"> -alt- </a></td>
		<td style="width: 1017px; height: 94px;" ><span class="my-small-font"><br />
		more easy, a bit more generalized, 
		for self-study</span></td>
	</tr>
	<tr>
		<td style="width: 634px; height: 71px;" ><i>the 'system handbook':</i><br><a href="https://rolffson.de/1401/bitsavers_doc/A24-1403-5_1401_Reference_Apr62.pdf">IBM 1401 Reference Manual (1962)</a></td>
		<td style="width: 105px; height: 71px;" ><a href="http://bitsavers.org/pdf/ibm/1401/A24-1403-5_1401_Reference_Apr62.pdf"> -alt- </a></td>
		<td style="width: 1017px; height: 71px;" ><span class="my-small-font">original IBM documentation, 
		contains all CPU instructions with detailed description</span></td>
	</tr>
	<tr>
		<td style="width: 634px; height: 30px;" ><br />
		</td>
		<td style="width: 105px; height: 30px;" ><br />
		</td>
		<td style="width: 1017px; height: 30px;" ><br />
		</td>
	</tr>
	<tr>
		<td style="width: 634px; height: 53px;"><a href="https://rolffson.de/1401/bitsavers_doc/A_Guide_to_1401_Programming_1961.pdf">A Guide to 1401 Programming (1961)</a></td>
		<td style="width: 105px; height: 53px;"><a href="http://bitsavers.org/pdf/ibm/1401/A_Guide_to_1401_Programming_1961.pdf"> -alt- </a></td>
		<td style="width: 1017px; height: 53px;"><span class="my-small-font">pragmatic, detailed, self-study, reprint of original IBM<br>personal study program "Principles Of Programming"</span></td>
	</tr>
	<tr>
		<td style="width: 634px; height: 38px;" ><a href="https://rolffson.de/1401/bitsavers_doc/A24-3144-2_1401_operGuide.pdf">IBM 1401 operation guide</a></td>
		<td style="width: 105px; height: 38px;" ><a href="http://bitsavers.org/pdf/ibm/1401/A24-3144-2_1401_operGuide.pdf"> -alt- </a></td>
		<td style="width: 1017px; height: 38px;" ><span class="my-small-font">original IBM documentation, 
		handling the system</span></td>
	</tr>
	<tr>
		<td style="width: 634px; height: 36px;" ><br />
		<a href="https://rolffson.de/1401/bitsavers_doc/PPierce-ibm-c24-1480-0.pdf">IBM 1401 SPS-1 and SPS-2</a></td>
		<td style="width: 105px; height: 36px;" >
		<br />
		<a href="http://ibm-1401.info/PPierce-ibm-c24-1480-0.pdf">-alt-</a></td>
		<td style="width: 1017px; height: 36px;" ><br />
		<span class="my-small-font">SPS (Symbolic Programming System) programming</span></td>
	</tr>
	
</table>


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`);