Questions tagged [6502]
For questions about the 6502 series of processors, including hardware and assembly language questions. For questions about the hardware interface also use the "hardware" tag.
95
questions
3
votes
2answers
360 views
Why don't all Absolute,X instructions take an extra cycle to cross page boundaries?
The question is about 6502 instructions that take an extra cycle when address calculation carries over into the high byte of the address. This affects addressing modes Absolute,X, Absolute,Y, Indirect,...
45
votes
7answers
9k views
Could you reverse engineer silicon just by looking at it?
I was interested in a recent interview of Masayuki Uemura, one of the engineers who designed the Nintendo Famicom in the early 80s. During initial design phase of the Famicom, one of the first things ...
18
votes
3answers
3k views
Where to buy a 6502 chip
I want to purchase a 6502 40 pin CPU in order to verify if my 6502 is faulty, I've seen I can buy from Hong Kong but would prefer closer (to the UK), RS and CPC don’t seen to have any.
Most answers ...
41
votes
12answers
6k views
What languages are better fit for generating efficient code for 8-bit CPU's than C?
I found Why do C to Z80 compilers produce poor code? very interesting as it pointed out that C (which was designed to be an abstraction of a CPU for porting Unix) was not a very easy language to ...
4
votes
4answers
355 views
Would having the console's CPU help in emulation hypothetically?
If I had a hypothetical computer just like nowaday's computers, but it had an NMOS 6502, would it provide me with a better emulation experience than if I were to emulate the 6502 inside software? Also,...
8
votes
3answers
404 views
Did the 6502 need both ADC immediate and SBC immediate?
The 6502 uses the carry bit system (over a borrow bit). On such machines, the bitwise NOT is applied to the subtrahend before it is "subtracted" (really, added, taking advantage of two's complement) ...
11
votes
3answers
317 views
Do any 6502 assemblers have better support for self-modifying code?
I find I keep on doing things like this:
raster_interrupt:
bgnd_color = * + 1
lda #$00
sta $d021
; rest of interrupt handler
so that I can do this kind of thing elsewhere in my ...
9
votes
1answer
223 views
6502 False Reads and Apple II I/O
The 6502 series of CPUs has an
interesting quirk:
indexed loads and stores may perform a "false read", reading from the
target address or a different address on a previous page. There are
situations, ...
15
votes
3answers
1k views
For how long can you safely stop the clock on an NMOS 6502?
As with most NMOS processors, the NMOS versions of the 6502 (and even
earlier CMOS versions) do not have a static core. Thus, if you run the
clock too slowly or stop the clock for too long while doing ...
2
votes
3answers
152 views
How can I get cl65 to include its subroutines, like pushax and tosmulax?
This question is about cc65, which is a toolkit including a C compiler, assembler, linker, etc. All targeting various 6502 computers, like the various 8 bit commodores, the Apple II and whatever else. ...
3
votes
3answers
438 views
How to transfer the address of a data block into zero page using the Merlin 8 assembler on my Apple //e?
I've been fooling around with the Merlin 8 (v2.58) assembler on my Apple IIe and ran into a small snag.
Basically, I would like to load the address of a block of data into a two-byte pair in zero ...
15
votes
1answer
2k views
Why did the Apple IIe use a 2 MHz-rated 6502, even though it ran at only 1 MHz?
The Apple IIe was designed to be timing-compatible with the Apple II+ so that timing-depndent software (such games and copy-protection systems) and hardware designed for the Apple II and II+ would, ...
19
votes
4answers
3k views
How did integer multiplication work in 8-bit BASIC without CPU support
I've recently been teaching my 11 year old binary multiplication, which is on the UK maths syllabus at secondary school. We have used long multiplication, eg shift and add.
This has made me wonder ...
11
votes
0answers
452 views
Why did some MOS 6502 packages have holes in them?
Someone was recently selling an early MOS 6502 CPU on Ebay (date code 0277) in a ceramic package that had a couple of holes in it. You can see them clearly (under the tape, which presumably was not ...
4
votes
4answers
960 views
Why use an ADC or SBC with immediate zero on a 6502?
I'm perusing the Apple I version of BASIC, later known as Integer BASIC on the II. In several places I see...
ADC #$00
or
SBC #$00
Unless I'm mistaken, these mean add/subtract zero. What ...
7
votes
2answers
465 views
How to pass data pointer to subroutine to use with Absolute,Y addressing?
I may be going about this the wrong way, so sorry if it is wrong, I'm coming to 6502 after 32 years (when I was 8 years old !)
I want to pass a pointer to some data, either data1 or data2 to a sub ...
4
votes
1answer
753 views
6502 - AND instruction updates flags differently than other logic operations
Why AND instruction updates flags in the fetch step?
Others logic instructions like ORA and EOR update flags in the same step that they update accumulator, in the decode step.
Is it a bug of ...
31
votes
3answers
3k views
How did Elite do vertex transformation?
In 3D graphics, vertex transformation is the process of converting x,y,z coordinates in 3D space, to x,y coordinates on the screen. According to https://www.khronos.org/opengl/wiki/...
11
votes
3answers
2k views
6502 reset pin: always needed on power on?
The 6502 pinout has a reset pin, which presumably would be used if a reset button is pressed on the machine containing the CPU.
But the 6507 contains the same pin. The 6507 was designed at the ...
3
votes
2answers
177 views
6502 interrupts when RDY is low
If the NMI line goes from high to low when the RDY is low, is the NMI detected, so that when RDY goes high, NMI is performed ?
Or is the NMI discarded when it occurs when RDY is low ?
(In case of ...
4
votes
2answers
692 views
Adding a register to the accumulator in 6502
In the past, the only assembly programming I've done has been a tiny bit of ARM, and then a larger game project in 68k.
In 68k I was used to being able to do things like add.l d0, d1 to add the ...
5
votes
3answers
847 views
Indirect addressing using address bits as marker (tagged address)
After reading about the Signetics 2650, and being a bit familiar with the HP2100's, I'm curious how common the style of "indirect addressing via the address value" instruction was at the time?
CPUs ...
19
votes
1answer
2k views
How did the 6502 ALU perform a decrement?
Assuming that this diagram is correct:
Instructions like INC, INX, and INY can easily perform increment using ALU sum with data on B input, 0 on A input and carry_in set.
But how do instructions ...
6
votes
1answer
281 views
Putting code into two different memory areas with cc65/ca65
According to cc65 / ca65 documentation, the .org directive does not affect the placement of the code unlike with other 6502 assemblers. The docs suggest defining a memory segment with the intended ...
22
votes
2answers
2k views
Why didn't the 6502 have increase/decrease opcodes for A?
In 6502 Assembly, we can use INX and INY to increase the value stored in X and Y. They can be decreased with DEX and DEY. However, it seems that there are no such instructions for A, like INA or DEA. ...
19
votes
4answers
3k views
Why are branches relative in many 8-bit CPUs?
I was looking over an old article on the 6809 and was perusing the opcodes and noticed that the branch instructions came in two flavors, long and short. That sparked a memory about one of the 6502-...
11
votes
1answer
477 views
Why didn't Wozniak's interrupts work on the Apple I monitor program?
In his autobiography, Steve Wozniak recounts[1] his difficulty getting interrupts working on the 6502 microprocessor:
The next step was to debug the 256-byte monitor program on the PROMs. I spent ...
40
votes
3answers
5k views
What happened to the SEV instruction on the 6502?
The 6502 has a group of opcodes which copy bit 5 from the opcode into one of the status flags.
(I know it's not implemented this way, but it looks as though the bit fields are: 2 bits to select the ...
15
votes
6answers
5k views
How slow was the 6502 BASIC compared to Assembly
Imagine a modern computer, where let's say Python is a high level programming language and needs to be interpreted in order to execute a piece of code. You could write some code in C, compile it, ...
14
votes
12answers
4k views
Late 1970s and 6502 chip facilities for operating systems
I'm quite unfamiliar with how operating systems used to be written but its clear to me that operating systems were clearly written for these systems. I'm particularly interested in how operating ...
25
votes
3answers
3k views
What are uses of the byte after BRK instruction on 6502?
The BRK instruction on the MOS 6502 seems to be one of the more
ill-documented features of the processor. The 1976 preliminary data
sheet from MOS indicates that it's a 1-byte instruction using
the &...
13
votes
1answer
863 views
Does the Commodore CDTV-CR contain a 65C02 for some reason?
Browsing around the FS-UAE source code I discovered a 65(S)C02 emulation core, which appears to not be referenced anywhere outside of some CDTV-CR related source file.
Apparently, a CDTV is ...
5
votes
4answers
740 views
6502: is BCD *fundamentally* the same performance as non-BCD?
Furthering my reading of MS BASIC and Woz's FP code and comparing the two leads to another question specific to the 6502...
From what I can see looking over the 6502 instruction guides, it appears ...
15
votes
3answers
626 views
Did any micros use the 6502 BCD mode in their OS?
I know the Atari's FP package used BCD for rather dubious reasons, but does anyone know of other examples of basic "operating system" level code on common platforms that used BCD?
I suspect BCD was ...
9
votes
4answers
756 views
How is PETSCII used by assembly-language programs?
First, a bit of context. I wrote an
interactive disassembler for 6502 code that,
among other things, attempts to identify ASCII strings automatically.
Appropriate source code for different assemblers ...
3
votes
3answers
344 views
Interrupt pin type on the 6502
I have a really basic question. I have to design an 65C02-based personal computer for a school project. I have to draw my own footprint for the 65C02. My question is what type of pin is the IRQB (...
9
votes
1answer
305 views
SYNC and the 65CE02 instruction timing
From the Wikipedia's 65CE02 page:
Internally, the pipeline of the 65CE02 was redesigned to reduce the
number of cycles required to execute an instruction. The 65CE02 can
recover faster from ...
8
votes
3answers
1k views
Behavior of the zero and negative/sign flags on classic instruction sets
It seems to me that there's effectively two ways that the zero bit could work.
Z is set iff the result of a computation is mathematically equal to 0.
Z is set iff a bit pattern consisting entirely of ...
8
votes
1answer
314 views
When did the 65C02 become available?
The Wikipedia article on the 65C02 is missing an introduction date for any of the mentioned models. I did a bit of poking about with no success. Does anyone know when they were introduced?
22
votes
1answer
1k views
How good was Woz's FP code?
I just came across this amazing 1976 article by Woz. In it he describes a relatively complete floating-point system for the 6502 with a 32-bit format (similar to earlier MS code).
I understand the ...
3
votes
2answers
497 views
How exactly do all control signals in 6502 work?
I'm trying to make a 6502 replica in Logisim. I want to know what exactly each control signal in 6502, how the clock cycles work and additionally I would like to see an example of these control ...
33
votes
5answers
6k views
Why does the 6502 have the BIT instruction?
The 6502 has a bit instruction which
copies two of the bits into the N and V flags,
pretends to and the byte with the accumulator, but discards the result and only affects Z.
I'm having a hard time ...
4
votes
1answer
177 views
65C816: Inputs TTL-compatible?
New 65C816 datasheets say that Vih (for the data bus in particular) is 0.8Vdd, i.e. not TTL-compaible.
Old data sheets (for example, the one published in Apple IIgs Hardware Reference) say that at 5V ...
9
votes
1answer
813 views
Looking for a specific 6502 Assembler
I found some 6502 assembler code for a Commodore 64 program that uses meta commands like #include "foobar", define the address to be assembled to via *=$1234 and define labels without a colon. ...
1
vote
6answers
1k views
Compile the 6502 assembler source code for running on modern computers [closed]
I want to make an executable file for modern computers that you can download and run without any other software, using any kind of a 6502 assembler.
Can I compile source code, written for the 6502, ...
7
votes
2answers
385 views
Could a 6502 use different speeds of RAM in a single machine?
I'm not sure I've entirely formed the idea in my head, but I'll ask anyway...
One of the things I learned here in RO is that the BBC gained speed by using faster RAM, thereby avoiding cycle stealing ...
9
votes
1answer
356 views
What's the purpose of HOLD command in 6502 stack pointer
In the Block Diagram the Stack Pointer Register (S) has a HOLD command in addition to the LOAD and BUS ENABLE commands. The HOLD command is linked to the S/S output of the Random Control Logic. What ...
3
votes
2answers
395 views
How to express hi/lo byte of a label in crasm
I am trying to move my project from xa (which I found rather buggy) to crasm, which is the other 6502 assembler that comes with debian.
My project contains a lot of lines like
ldx #<pname
ldy #&...
16
votes
5answers
3k views
Why are different emulators needed to run platforms that use 6502 assembly code?
To my knowledge, an emulator turns machine code for a console into something that your computer can understand. For example, assembly code from a Gamecube game is not the same as from a .exe file.
...
9
votes
1answer
1k views
Why does this 6502 code push a function address onto the stack before calling?
I am learning how to program the Atari 800 by examining some tutorial code that came with the IDE/Assembler I am using. I am using the MADS assembler for this.
putchar_ptr = $346
csrhinh = 752
...
