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<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="FONT: 10pt arial; BACKGROUND: #e4e4e4; font-color: black"><B>From:</B>
<A title=ethan.dicks@gmail.com href="mailto:ethan.dicks@gmail.com">Ethan
Dicks</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=simh@trailing-edge.com
href="mailto:simh@trailing-edge.com">simh@trailing-edge.com</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Sunday, June 25, 2017 6:22 PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [Simh] PDP-8 and OS/8
assembly</DIV>
<DIV><BR></DIV>
<DIV>On Sun, Jun 25, 2017 at 5:50 PM, Bill Cunningham <<A
href="mailto:billcun@suddenlink.net">billcun@suddenlink.net</A>>
wrote:<BR>> I am reading a bit about the machine
the PDP-8. 4K fortran I guess was<BR>> used,<BR><BR>That was one option,
yes.<BR><BR>> there were 8 "registers" if that's right.<BR><BR>Not sure
where this is coming from...<BR></DIV>
<DIV><FONT size=2 face=Arial>Oh I'm sorry I meant operation codes. 3
registers. I believe 8 opcodes.</FONT></DIV><FONT size=2 face=Arial></FONT>
<DIV><BR>There's the 12-bit Accumulator and its associated LINK (carry)
bit.<BR>Some models always have a 12-bit MQ (Multiplier Quotient)
register,<BR>some get an MQ when the EAE is installed, and some never get
it.<BR>There's a 12-bit Program Counter, and two extended field
registers,<BR>either 1-bit, 2-bit (PDP-8/L) or 3-bit (many other models) if
the<BR>memory extension hardware is installed (required to have over
4K)<BR><BR>> And 12 bit words.<BR><BR>Yes.<BR><BR>> As far as languages
here, is Macro-8 assembly language?<BR><BR>Look for assemblers called PAL (PAL
III and PAL8) and MACREL (though<BR>MACREL was a late addition)<BR></DIV>
<DIV><FONT size=2 face=Arial>OK</FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT><BR>> Is there
an assembler available for PDP-8? OS/8 preferrably but tss-8 or<BR>>
anything would do?<BR><BR>Plenty of assembler possibilities with OS/8. I
have no experience with TSS-8.<BR><BR><A
href="http://www.computinghistory.org.uk/det/8391/PDP8-PALAssembly-Language/">http://www.computinghistory.org.uk/det/8391/PDP8-PALAssembly-Language/</A><BR><BR>-ethan<BR></DIV>
<DIV><FONT size=2 face=Arial>OK I see. The registers other than AC and the two
others are all I've heard of. Where Do I ge this...</FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial><A
href="https://www.grc.com/pdp-8/pdp-8.htm">https://www.grc.com/pdp-8/pdp-8.htm</A></FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial>Pretty nice page. I just found it
earlier.</FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial>Bill</FONT></DIV>
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