6502 Software Development Serial Terminals Hardware Bugs And You Some Disassembly Required

By switzerlandersing On Sep 14, 2025

6502 Software Development: Serial Terminals, Hardware Bugs, And You - Some Disassembly Required

6502 Software Development: Serial Terminals, Hardware Bugs, And You - Some Disassembly Required Quite a few successful early microcomputers used the mos 6502 cpu. this included, but was not limited to, systems like the apple i, apple ii, commodore pet, and ataris. a followup known as the mos. 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 suggest trying a 65c02 processor but these all seem to run at a far greater processing speed than my 6502 clocked at 0.75mhz, would a 65c02 even work?.

6502 Software Development: Serial Terminals, Hardware Bugs, And You - Some Disassembly Required

6502 Software Development: Serial Terminals, Hardware Bugs, And You - Some Disassembly Required A lot has been said on the internet about the 6502, at 1mhz, being roughly equivalent in performance to the z80, at 4 mhz. it is said the z80 has a typical 4 clock ticks per instruction, while the. 11 assuming you’re asking: what can the 6502 be seen to be doing by an external observer, then the data sheet has a full breakdown of bus activity per cycle per addressing mode; that was long ago transcribed into ascii form by the commodore community and is now often sourced from that 64doc.txt. A risc based implementation of the apple ii 6502 processor: in mid ’85 i performed an analysis that showed a simple risc style implementation of a 16‐bit binary compatible superset of the 8‐bit microprocessor used in the apple ii 6502, along with some judicious use of on‐chip caching, could substantially improve performance – to the. 10 is there an standardised 6502 assembly syntax? not really. while mos' own cross assembler might have been a base, it was way too primitive to be be considered. still, there is a line that can be followed from that cross assembler over the kim resident assembler and various commodore/cbm assemblers all the way to more recent implementation.

6502 Software Development: Serial Terminals, Hardware Bugs, And You - Some Disassembly Required

6502 Software Development: Serial Terminals, Hardware Bugs, And You - Some Disassembly Required A risc based implementation of the apple ii 6502 processor: in mid ’85 i performed an analysis that showed a simple risc style implementation of a 16‐bit binary compatible superset of the 8‐bit microprocessor used in the apple ii 6502, along with some judicious use of on‐chip caching, could substantially improve performance – to the. 10 is there an standardised 6502 assembly syntax? not really. while mos' own cross assembler might have been a base, it was way too primitive to be be considered. still, there is a line that can be followed from that cross assembler over the kim resident assembler and various commodore/cbm assemblers all the way to more recent implementation. The commodore 65ce02, among many excellent additions, contains one i don't understand: the neg instruction. this certainly serves a purpose on machines without the equivalent of the sbc, like the p. 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. 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. On the 6502, the brk instruction is a software interrupt. like any other interrupt, it pushes the status word to the stack and then the program counter, before transferring control to an interrupt.