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Miscellaneous notes about the assembler format and useful URLs.

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Warren Toomey 2016-02-25 07:37:15 +10:00
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misc/asm_syntax.txt Normal file
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Basics of the Unix assembler syntax
Lines starting with " are comment lines
. is the location counter, where the next code or constant will be placed
.. is the relocation counter
t = 0 No idea on this yet
orig: is a label. It looks like labels can have dots in them.
Dots seem to separate structures and fields, e.g. u.base
but there are some symbols that start with dots, e.g. .seek
jms copy; 10; u.rg+2; 6 Semicolons separate instructions and
word expressions that follow the instruction
Some expressions are 0:0, not sure about this
jmp 1f Jump back to the closest 1: label
jmp 1b Jump forward to the closest 1: label
I'm not sure why some lines are indented differently to others e.g.
jms betwen; o10000; o17762
jms error
dac .+1
-1 occurs instead of instructions, so it looks like the assembler allows
literal constants at any time.
String literals seem to be two characters decorated with < > characters, e.g.
"ab" is <a>b. I'm guessing these are placed as pairs in one word.
Looks like a line can contain multiple labels, e.g. o12: d10: 10
Numeric literals: 0xx are octal values, [1-9]xx are decimal values.

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http://www.soemtron.org/pdp7.html
a "macro7" cross-assembler at:
https://github.com/simh/simtools/tree/master/crossassemblers/macro7
http://bitsavers.trailing-edge.com/pdf/dec/pdp7/
Name Last modified Size Description
DEC-07-SDDA-D_DECSYS7_Nov66.pdf 2009-12-27 21:50 1.5M
DEC-7-I0-O_TTYpkg_Jan65.pdf 2009-12-27 21:50 221K
DEC-7U-YXTA-D_DECTOG_Oct69.pdf 2009-12-27 21:50 337K
DECSYS-7_OperMan.pdf 2009-12-27 21:50 1.4M
DIGITAL-7-10-O_TTYoutputPkg.pdf 2009-12-27 21:50 215K
DIGITAL-7-11-IO_TICTOC_Apr64.pdf 2009-12-27 21:50 446K
DIGITAL-7-12-I_FFloader.pdf 2009-12-27 21:50 357K
DIGITAL-7-12-I_FunnyFormat_Loader_Jan65.pdf 2009-12-27 21:50 339K
DIGITAL-7-13-I_RIM_Loader_Jul65.pdf 2009-12-27 21:50 73K
DIGITAL-7-20-IO-FB_DECTOG.pdf 2009-12-27 21:50 1.4M
DIGITAL-7-21-IO-Sym_DECTREIVE.pdf 2009-12-27 21:50 633K
DIGITAL-7-22A-IO_DECTAPE_Subrts_Jan66.pdf 2009-12-27 21:50 892K
DIGITAL-7-30-A_FltPtPkg.pdf 2009-12-27 21:50 628K
DIGITAL-7-31-F-Sym_SignedMult.pdf 2009-12-27 21:51 197K
DIGITAL-7-40-U_MasterTapeDuplicator_Dec64.pdf 2009-12-27 21:51 252K
DIGITAL-7-40-U_tapeDupl.pdf 2009-12-27 21:51 256K
DIGITAL-7-42-U_RIM_Puncher_Sep62.pdf 2009-12-27 21:51 168K
DIGITAL-7-50-M_ttyTest.pdf 2009-12-27 21:51 164K
DIGITAL-7-51-M_ClockIntrTest_Nov62.pdf 2009-12-27 21:51 173K
DIGITAL-7-52-M_CONTEST_II_May63.pdf 2009-12-27 21:51 518K
DIGITAL-7-54-M_MAINDEC701_InstrTest_Mar66.pdf 2009-12-27 21:51 1.8M
DIGITAL-7-55-M_MAINDEC_702R_ExtMemChkbd_May66.pdf 2009-12-27 21:51 576K
DIGITAL-7-56-M_MAINDEC_703_MemAdrTest_Jul65.pdf 2009-12-27 21:51 210K
DIGITAL-7-57-M_MAINDEC_710_PTP_Rdr_Aug65.pdf 2009-12-27 21:51 561K
DIGITAL-7-60-N_Type34DisplayTest_Apr65.pdf 2009-12-27 21:51 767K
DIGITAL-7-78-M_370LightPenDiag_Apr64.pdf 2009-12-27 21:51 843K
DIGITAL-7-81-M_MAINDEC_712_PTP_Pun_Jul65.pdf 2009-12-27 21:51 497K
DIGITAL-7-92-M_PDP-7_EAE_Part1_Mar66.pdf 2009-12-27 21:51 2.2M
DIGITAL-7-93-U_DECTRIEVE-7_Dec65.pdf 2009-12-27 21:51 466K
DIGITAL-7-94-U_DECTAPE_COPY_Jan66.pdf 2009-12-27 21:51 221K
DIGITAL-7-95-U_ExecuteSubr_Jan66.pdf 2009-12-27 21:51 247K
F-75P_PDP7prelimUM_Dec64.pdf 2009-12-27 21:52 5.5M
F-75_PDP-7userHbk_Jun65.pdf 2009-12-27 21:52 11M
F-77A_pdp7maint_1966.pdf 2009-12-27 21:53 17M
MAINDEC-7-D1CC-D_extdMemTest_Nov69.pdf 2009-12-27 21:53 3.8M
PDP-7_AsmMan.pdf 2009-12-27 21:53 1.6M
PDP-7_BUS-PAK_II_Jan65.pdf 2009-12-27 21:53 3.5M
PDP-7_Brochure.pdf 2009-12-27 21:53 1.3M
PDP-7_DDT_Ref.pdf 2009-12-27 21:53 763K
PDP-7_FortranII.pdf 2009-12-27 21:53 2.8M
PDP-7_InterfMan.pdf 2009-12-27 21:54 3.3M
PDP-7_Maint.pdf 2009-12-27 21:55 36M
PDP-7_SymTapeEd.pdf 2009-12-27 21:55 1.0M
PDP-7_brochure.zip 2009-12-27 21:55 6.5M
PDP7_ProgramLibrList.pdf 2009-12-27 21:55 305K
PDP7_appNote701.pdf 2009-12-27 21:55 91K