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Use set16 to push items to the stack.
The previous method was not incorrect, but set16 already handles the little-endian logic for us, and there's no need to do something bespoke here that we then need to test for separately.
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@ -191,13 +191,7 @@ mos6502_free(mos6502 *cpu)
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void
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mos6502_push_stack(mos6502 *cpu, vm_16bit addr)
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{
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// First we need to set the hi byte, by shifting the address right 8
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// positions and using the base offset of the S register.
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mos6502_set(cpu, 0x0100 + cpu->S, addr & 0xff);
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// Next we must record the lo byte, this time by using a bitmask to
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// capture just the low end of addr, but recording it in S + 1.
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mos6502_set(cpu, 0x0100 + cpu->S + 1, addr >> 8);
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mos6502_set16(cpu, 0x100 + cpu->S, addr);
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// And finally we need to increment S by 2 (since we've used two
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// bytes in the stack).
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