18
votes
Accepted
What happened to the 65832?
In the 1988 Report on the 65c832, Mensch described the 65c832 as a back-burner project with an uncertain timeline:
Since WDC is not a gigantic conglomerate, it has limited
resources. If all ...
- 10.3k
10
votes
Accepted
Asking explanation of 65C02 assembler code
These are the page parts of all absolute addresses within the program. The whole process is described in detail on page 177 of the book (third paragraph).
The program is compiled to run at page $21 (...
- 232k
9
votes
Asking explanation of 65C02 assembler code
The relocatable routine is assembled to $2100:
=2100 112 CMDCODE EQU *
Relocation is simplified by the CMDCODE routine only occupying one page and starting at a page boundary, ...
- 7,698
9
votes
What happened to the 65832?
I suppose you have heard of the draft datasheet of the 65832?
https://downloads.reactivemicro.com/Electronics/CPU/W65C832%20CPU%20Datasheet%20v2.0.pdf
Apple was the main customer of the 65816 (for ...
- 3,727
7
votes
What are the normal signals on a 65C02 in an Apple IIe?
65C02 is a CMOS version of 6502 (which was NMOS) chip. Judging from Wikipedia articles on these chips and few of the datasheets I found, it seems like it should work exactly the same way it did on ...
- 1,344
7
votes
Can someone help me port the fat32 library used in the x16 to my homebrew 65c02?
Arguably, it would be easier to port your code to ca65 than the fat32 code from ca65. The ca65 toolset is quite robust. 90+% of that code (at a glance at least) is "just 6502". I don't see ...
- 12.4k
6
votes
Is the W65C02S TTL-compatible?
Is the W65C02S TTL-compatible?
TLDR: Yes as compatible as various implementations can be.
After all, compatibility means that devices can work within given specs, not that they are the same in all ...
- 232k
5
votes
What happened to the 65832?
At some point before 1990 the idea seems to have first surfaced as a 'report' about 6502 chronology and future processors might suggest. It includes not only information about the ghostly 6516, but ...
- 232k
5
votes
Interrupt pin type on the 6502
The W65C02 data sheet does explain it (p. 9):
3.4 Interrupt Request (IRQB)
The Interrupt Request (IRQB) input signal is used to request that an interrupt sequence be initiated. The program
...
- 29.1k
5
votes
Accepted
What are the normal signals on a 65C02 in an Apple IIe?
I've been meaning to get around to this for ages, sorry. Tonight I stumbled across SAMS COMPUTERFACTS for the Apple IIe which I had downloaded from the Internet Archive.
Here is the logic chart data ...
- 7,698
4
votes
Accepted
65C816: Inputs TTL-compatible?
Are old 65C816s TTL compatible?
If their Vih is 2.0v, they are certainly TTL-compatible.
Was there some kind of change?
All WDC chips seem to be verilog-reimplemented, so when they synthesized ...
- 10.9k
3
votes
Accepted
1
vote
Accepted
Is the W65C02S TTL-compatible?
The short answer is that in the general case, no, the W65C02S is not
TTL-compatible. However, you can probably make it work reliably in a TTL
system if you know what you're doing, you're careful (...
- 27.2k
1
vote
Is the W65C02S TTL-compatible?
Technically, if this is about the CPU itself being TTL compatible, no it is not compatible, because according to datasheet, it uses standard CMOS level inputs, which are not compatible with TTL level ...
- 35.7k
1
vote
Interrupt pin type on the 6502
An interrupt pin of a CPU will always be an Input.
After all, it's whole purpose is to tell the CPU about an interrupt pending. Wouldn't work if it's an output, would it?
- 232k
1
vote
What are the normal signals on a 65C02 in an Apple IIe?
Who made your 65C02? Was it WDC?
If it's WDC, then there are a few pins that should be held high with a 3.3k pull-up resistor. Such as the BE pin which is only on WDC versions. BE (Bus Enable) ...
- 8,641
Only top scored, non community-wiki answers of a minimum length are eligible