Meanwhile reachable only at https://web.archive.org/web/20211126214 ... _instr.pdf

Not only is the underscore character not on the C64 keyboard, it is not even in the PETSCII character set.
Does the ROM get copied to RAM, such that you can alter the character set? My HP-71 lets you load in different character sets, telling it what dots to turn on for each; so although it comes ...

Since there's already a S>D word that extends a single to a double, you could shorten the name above to something like B>N.
Since words that operate on a byte in Forth tend to start with a 'C' such as C@ C! and C, what about naming it C>S ?
AFAIK the C prefix words seems to be more for memory ...

#JeeK, do you happen to know what are the proper parameters when calling LIST function? It does actually work just by "jsr LIST" but there are at least Z and C flags and Reg-A involved. I'm writing SAVE and LOAD functions. I was going to use LIST cmd without screen output for SAVE and GETC (also ...

Hi,

Maybe someone whom knows 6502 MS BASIC very well could assist me. I try to debug what FLOAT2 and FOUT functions do.
FLOAT2 input:
FAC+1 LO byte of mantissa
FAC+2 HI byte of mantissa
X = exponent, but in which format? For integer $90?

FLOAT2 output:
FAC ?
FAC+1 ?
FAC+2 ?
FAC+3 ?

My main ...

You might find Supermon 816 useful, as it runs on the '816 in native mode.

Thanks, will check it out!

Maybe you will find Jammon (Jamaica Monitor) also useful. Despite it's old, it works nicely at least for my environment. I translated it to the ACME assembler syntax for better integration into ...

Only in a very limited sense, in that sometimes the fetch of the next opcode is overlapped with the final part of the previous instruction.

Also, I'm fairly sure the original Z80 wasn't pipelined either, at least not the ones from the 1970s.
It seems really just an overlapping too ... http://www ...

This seems like a good thread for the 1991 text document B.Y.O.ASSEMBLER -or- Build Your Own (Cross-) Assembler....in Forth by Brad Rodriguez - there's a lot more by him nearby including the Moving Forth series.
B.Y.O.ASSEMBLER perfectly describes how this kind of assembler are designed and built ...

I think nobody mentioned it previously. Wouldn't it be great to have such a list (summed up from the above) on http://6502org.wikidot.com?

HEADER "0branch", NOT_IMMEDIATE
0branch: PRIMITIVE
INX2
LDA FFFE,X
BEQ branch+2
.
.
.
By the way, you might want to make that $FFFFFE,X (i.e. long,X addressing) since abs,X will cross bank boundaries, so this will read from bank 1 (assuming the DBR is 0). I am guessing you're using this on a ...

...
Note 1 on page 38, immediately after table 5-5:
...
From the scope of this specific document, since it explicitly defines the symbols, those are the one we should use. The other document (which I have not read) has no bearing on the matter, even if the symbols used there are more conventional ...

I agree, but since WDC went to the effort of specifying their syntax I feel we ought to use it for consistency.
At least for "Programming the 65816" (see page 433, the opcode table), they don't really have the problem to go with the common logical symbols for AND, OR and XOR operators. And we can ...

WDC W65C816S 8/16-bit Microprocessor
13 September, 2010
11 November, 2016

p. 35, Table 5-4 Opcode Matrix

MSB 0, LSB C: TSB: blue
MSB 7, LSB A: PLY: blue
MSB B, LSB 2: LDA (d): blue
MSB *, LSB 6: white
MSB *, LSB 7: red


< blue = new instruction
> blue = 65C02 + 65802/65816
< red = Old ...

Programming the 65816

Some typos, but also missing clarfication about some addressing modes.
See also 65816 Addressing modes and cycle counts.


p. 4, p. 177
< JRS Using Absolute Indexed Indirect Addressing
--
> JSR Using Absolute Indexed Indirect Addressing


p. 52, para. 3:

In the 6502 ...

WDC W65C816S 8/16-bit Microprocessor
13 September, 2010
11 November, 2016

p. 35, Table 5-4 Opcode Matrix

MSB 0, LSB C: TSB: blue
MSB 7, LSB A: PLY: blue
MSB B, LSB 2: LDA (d): blue
MSB *, LSB 6: white
MSB *, LSB 7: red


< blue = new instruction
> blue = 65C02 + 65802/65816
< red = Old ...