Questions tagged [addressing]
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8 questions
5 votes
1 answer
228 views
How to address MEGA65 memory above 64 KB in VBCC?
Could you please help me to address MEGA65 memory above 64 KB using VBCC compiler? Below example of changing color attribute of a character works just for memory below 16-bit address space: #define ...
- 81
15 votes
2 answers
1k views
Why is the addressing mode for BRK defined as "stack" in the W65C02S datasheet?
I most online documentation, I find the addressing mode for BRK to be "implied", which is logical. In the W65C02S datasheet however, it is set as "stack": Is there some reasoning ...
- 1,287
12 votes
1 answer
1k views
Carry handling during address generation on a 6502
I'm trying to learn a bit more about the internal workings of the 6502. The manual says that the branch instructions do not affect the carry flag. However, my understanding is that some carry handling ...
4 votes
2 answers
473 views
How does the serial port on the RC2014 get addressed?
I see on the schematic that /M1 and A7 go to CS0 and CS1 respectively. As I recall, both of these need to be high for the chip to be selected. And A6 goes to CS2, which needs to be low for the chip to ...
- 41.2k