Retrocomputing Stack Exchange
Retrocomputing Stack Exchange

Questions tagged [assembly]

Assembly languages in general, of any architecture. Use with the particular processor’s tag as appropriate.

For questions about the assembly language of a microprocessor or CPU.

If specific to a particular processor, please also use the appropriate processor tag.

236 questions
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Meaning of $ and $$ in Modcomp assembly language

The Modcomp II was a 16-bit minicomputer circa 1970. As well as in FORTRAN IV, the Modcomp family could be programmed in assembly language, with syntax like this excerpt from Kermit for Modcomp: HZS,POSIT * …
Wayne Conrad
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How were interpreters loaded into computers?

I have been learning about PCs, the first of which was the Altair 8800. So that users could run programs, Micro-Soft created a BASIC interpreter to allow the program to be mapped to processor instructions. They originally fed the interpreter to the…
leaner
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What do the addressing modes imm, dir, and abs mean for the 65c816?

From http://www.6502.org/tutorials/65c816opcodes.html#6.1.1.2 For the CPX instruction: E0 3-x 3-x imm x.....xx . CPX #$54 E4 2 4-x+w dir x.....xx . CPX $10 EC 3 5-x abs x.....xx . CPX $9876 What is the…
AlphaCentauri
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3
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Is RosAsm assembler self-hosting?

I have a few questions about the RosAsm assembler (not in active development anymore) by René Tournois: Is/was there a command-line tool (i.e. without a GUI) included to generate executable programs from assembly source? I'm a bit confused, because…
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