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114 lines
4.5 KiB
HTML
114 lines
4.5 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<HTML>
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<HEAD>
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<META HTTP-EQUIV="content-type" CONTENT="text/html;charset=iso-8859-1">
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<META NAME="keywords" CONTENT="mos, rec, 8726, commodore, registers">
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<META NAME="author" CONTENT="Graham">
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<TITLE>REC reference</TITLE>
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</HEAD>
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<BODY BGCOLOR="#FFFFFF" LINK="#4040FF">
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<P><FONT SIZE="+2">REC 8726 (RAM Expansion Controller) reference</FONT></P>
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<TABLE BORDER="1" CELLSPACING="0" CELLPADDING="2" WIDTH="720">
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<CAPTION><FONT SIZE="+1">REC register set:</FONT></CAPTION>
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<TR>
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<TH WIDTH="12%"><FONT SIZE="-1"> </FONT></TH>
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<TH WIDTH="8%"><FONT SIZE="-1"> </FONT></TH>
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<TH WIDTH="10%"><FONT SIZE="-1">7</FONT></TH>
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<TH WIDTH="10%"><FONT SIZE="-1">6</FONT></TH>
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<TH WIDTH="10%"><FONT SIZE="-1">5</FONT></TH>
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<TH WIDTH="10%"><FONT SIZE="-1">4</FONT></TH>
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<TH WIDTH="10%"><FONT SIZE="-1">3</FONT></TH>
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<TH WIDTH="10%"><FONT SIZE="-1">2</FONT></TH>
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<TH WIDTH="10%"><FONT SIZE="-1">1</FONT></TH>
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<TH WIDTH="10%"><FONT SIZE="-1">0</FONT></TH>
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</TR>
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<TR>
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<TD><FONT SIZE="-1">$DF00 (R)</FONT></TD><TD><FONT SIZE="-1">SR</FONT></TD>
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<TD ALIGN="CENTER"><FONT SIZE="-1">IRQ</FONT></TD>
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<TD ALIGN="CENTER"><FONT SIZE="-1">EOB</FONT></TD>
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<TD ALIGN="CENTER"><FONT SIZE="-1">Verify</FONT></TD>
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<TD ALIGN="CENTER"><FONT SIZE="-1">Size</FONT></TD>
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<TD COLSPAN="4" ALIGN="CENTER"><FONT SIZE="-1">Version</FONT></TD>
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</TR>
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<TR>
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<TD><FONT SIZE="-1">$DF01 (R/W)</FONT></TD><TD><FONT SIZE="-1">CR</FONT></TD>
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<TD ALIGN="CENTER"><FONT SIZE="-1">Execute</FONT></TD>
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<TD BGCOLOR="#E0E0E0" ALIGN="CENTER"><FONT SIZE="-1">reserved ²</FONT></TD>
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<TD ALIGN="CENTER"><FONT SIZE="-1">Load</FONT></TD>
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<TD ALIGN="CENTER"><FONT SIZE="-1">FF00</FONT></TD>
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<TD COLSPAN="2" BGCOLOR="#E0E0E0" ALIGN="CENTER"><FONT SIZE="-1">reserved ²</FONT></TD>
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<TD COLSPAN="2" ALIGN="CENTER"><FONT SIZE="-1">Transfer Type</FONT></TD>
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</TR>
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<TR>
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<TD><FONT SIZE="-1">$DF02 (R/W)</FONT></TD><TD><FONT SIZE="-1"> </FONT></TD>
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<TD COLSPAN="8" ALIGN="CENTER"><FONT SIZE="-1">C64/C128 start address (A7-A0)</FONT></TD>
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</TR>
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<TR>
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<TD><FONT SIZE="-1">$DF03 (R/W)</FONT></TD><TD><FONT SIZE="-1"> </FONT></TD>
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<TD COLSPAN="8" ALIGN="CENTER"><FONT SIZE="-1">C64/C128 start address (A15-A8)</FONT></TD>
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</TR>
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<TR>
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<TD><FONT SIZE="-1">$DF04 (R/W)</FONT></TD><TD><FONT SIZE="-1"> </FONT></TD>
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<TD COLSPAN="8" ALIGN="CENTER"><FONT SIZE="-1">REU start address (A7-A0)</FONT></TD>
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</TR>
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<TR>
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<TD><FONT SIZE="-1">$DF05 (R/W)</FONT></TD><TD><FONT SIZE="-1"> </FONT></TD>
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<TD COLSPAN="8" ALIGN="CENTER"><FONT SIZE="-1">REU start address (A15-A8)</FONT></TD>
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</TR>
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<TR>
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<TD><FONT SIZE="-1">$DF06 (R/W)</FONT></TD><TD><FONT SIZE="-1"> </FONT></TD>
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<TD COLSPAN="5" BGCOLOR="#E0E0E0" ALIGN="CENTER"><FONT SIZE="-1">unused ¹</FONT></TD>
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<TD COLSPAN="3" ALIGN="CENTER"><FONT SIZE="-1">REU start address (A18-A16)</FONT></TD>
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</TR>
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<TR>
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<TD><FONT SIZE="-1">$DF07 (R/W)</FONT></TD><TD><FONT SIZE="-1"> </FONT></TD>
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<TD COLSPAN="8" ALIGN="CENTER"><FONT SIZE="-1">Transfer length (D7-D0)</FONT></TD>
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</TR>
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<TR>
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<TD><FONT SIZE="-1">$DF08 (R/W)</FONT></TD><TD><FONT SIZE="-1"> </FONT></TD>
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<TD COLSPAN="8" ALIGN="CENTER"><FONT SIZE="-1">Transfer length (D15-D8)</FONT></TD>
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</TR>
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<TR>
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<TD><FONT SIZE="-1">$DF09 (R/W)</FONT></TD><TD><FONT SIZE="-1"> </FONT></TD>
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<TD ALIGN="CENTER"><FONT SIZE="-1">IRQE</FONT></TD>
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<TD ALIGN="CENTER"><FONT SIZE="-1">EOBE</FONT></TD>
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<TD ALIGN="CENTER"><FONT SIZE="-1">VerifyE</FONT></TD>
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<TD COLSPAN="5" BGCOLOR="#E0E0E0" ALIGN="CENTER"><FONT SIZE="-1">unused ¹</FONT></TD>
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</TR>
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<TR>
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<TD><FONT SIZE="-1">$DF0A (R/W)</FONT></TD><TD><FONT SIZE="-1">ACR</FONT></TD>
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<TD ALIGN="CENTER"><FONT SIZE="-1">C64 fixed</FONT></TD>
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<TD ALIGN="CENTER"><FONT SIZE="-1">REU fixed</FONT></TD>
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<TD COLSPAN="6" BGCOLOR="#E0E0E0" ALIGN="CENTER"><FONT SIZE="-1">unused ¹</FONT></TD>
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</TR>
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</TABLE>
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<BR>
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¹ - Unused bits read back 1<BR>
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² - Reserved bits read back 0<BR>
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<BR><BR>
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<TABLE BORDER="1" CELLSPACING="0" CELLPADDING="2" WIDTH="192">
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<CAPTION><FONT SIZE="+1">Transfer Types:</FONT></CAPTION>
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<TR>
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<TD ALIGN="CENTER"><FONT SIZE="-1">0</FONT></TD>
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<TD ALIGN="CENTER"><FONT SIZE="-1">C64 to REU</FONT></TD>
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</TR>
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<TR>
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<TD ALIGN="CENTER"><FONT SIZE="-1">1</FONT></TD>
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<TD ALIGN="CENTER"><FONT SIZE="-1">REU to C64</FONT></TD>
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</TR>
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<TR>
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<TD ALIGN="CENTER"><FONT SIZE="-1">2</FONT></TD>
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<TD ALIGN="CENTER"><FONT SIZE="-1">Swap</FONT></TD>
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</TR>
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<TR>
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<TD ALIGN="CENTER"><FONT SIZE="-1">3</FONT></TD>
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<TD ALIGN="CENTER"><FONT SIZE="-1">Verify</FONT></TD>
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</TR>
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</TABLE>
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<BR><BR>
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© 2010 Graham
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</BODY></HTML>
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