it doesn't have at least one byte available. This seems to be a bug of
the Atari ROM code.
+Default drivers: <tt/atr8.tgi (atr8_tgi) and /<tt/atrx8.tgi (atrx8_tgi)/.
+
<sect1>Extended memory drivers<p>
Currently there is only one extended memory driver. It manages the second 64K of a 130XE.
<caption>
</table>
+Default drivers: <tt/atrstd.joy (atrstd_joy)/ and <tt/atrxstd.joy (atrxstd_joy)/.
<sect1>Mouse drivers<p>
All mouse devices connect to joystick port #0.
+Default drivers: <tt/atrst.mou (atrst_mou)/ and <tt/atrxst.mou (atrxst_mou)/.
<sect1>RS232 device drivers<p>