libz80/CHANGES

Changes to version 2.1.0

Created CHANGES
Added ExecuteTStates
Working interrupts in all modes:
Test libz80 against the fuse test suite.
Fix suspicious line in Makefile
Track t states
Increment R on every M (opcode fetch) cycle.
All block instructions execute one iteration per call to Z80Execute.
Simplify DJNZ.
Z80Debug no longer affects R register
OUTD and OTDR set all flags
IND and INDR set all flags
CPD sets F5
LDD sets F5
INIR per FUSE and Undoc. Z80 Documented
LDI and LDIR per FUSE.
INI sets H, C and P flags per the MSB of (HL) + BC + 1.
CPI and CPD set F3 and F5
LDI sets F5 to bit 1 of A + (HL).
OUT (C),0 puts B on the upper half of the address bus
RLD sets F3 and F5
IN r,(C) sets F3 and F5
Indexed bit operations set f5 and f3 per the msb of the effective address
Compile with -ansi and -Wall, then fix all resulting warnings.
Fixed negative displacements for undocumented shift/rotate/bit instructions
Fixed negative displacements for indexed SLL/SRL/SLA/SRA
Fixed negative displacements for indexed RLC/RRC/RL/RR
Fixed negative displacements for indexed CP
Fixed negative displacements for ADD/ADC/SUB/SBB
Fixed negative displacements for LD (ii+d),n
Fixed negative displacements for LD (ii+d),r
Fixed negative displacements for LD r,(ii+d)
Fix negative displacements for indexed SET and RES
Fix negative displacements with indexed BIT
Fix negative displacements with indexed AND, XOR and OR
Fix negative displacements with indexed INC/DEC
16-bit adds and subtracts no longer always use carry
The BIT instruction always sets F3 and F5, not just when b=3 or b=5.
8-bit adds set f3 and f5
CCF sets flags F3 and F5
SCF sets f3 and f5
CPL sets f3 and f5
8-bit increments and decrements set flags f3 and f5
16-bit adds set flags f3 and f5
Created .dir-locals.el to set emacs style & indentation
Add generated test and util files to .gitignore files
Merge with 2.0
HALT does not increment pc until an interrupt occurs. NMI and INT unhalt the processor
INDR sets the negative flag
INIR sets negative flag
IN r,(C) sets flags
OUTD places B on the top half of the address bus
OUT (C),r places B on the top half of the address bus
OUT (n),A places B on the top half of the address bus
OUTI places B on the top half of the address bus
INI places B on the top half of the address bus
IND places B on to the top half of the address bus
IN r,(C) places B on the top half of the address bus
IN A(n) places A on the top half of the address bus
For all conditional jumps, calls and returns: Swapped sense of Z and NZ; and of PE and PO.
RRD computes correct value and sets flags appropriately
RLD computes correct value and sets flags appropriately
SRA preserves bit 7
Fix RLC m, RRC m, RL m, RR m.  They were doing a "rotate immediate," in effect.
DEC ss and INC ss increment the proper register, and preserve flags.
ADD IX,rr and ADD IY,rr set the flags propelry
SBC HL,pp sets the flags properly
ADC HL,pp and ADD HL,pp set the flags properly
ADD HL,ss sets flags
NEG sets flags properly
Fix DAA instruction.  It had a segfault for some arguments, and generated incorrect results for many others.
eight-bit decrements set half-carry properly
Parity is set when even, not odd
Subtraction now sets overflow flag properly
Arithmetic operations set zero flag properly
CPDR leaves HL pointer to the byte before the target, and BC set to the number of bytes not searched.
CPI and CPIR bug fix: Preserve carry flag
Fix CPIR: HL now points to the byte after the match, rather than to the match; BC now contains the number of bytes not searched, rather than the number of bytes not searched plus one.
Fix all pops.  They were loading from (sp+1) and (sp+2) rather than (sp) and (sp + 1).
Fix all pushes.  They were storing at (sp) and (sp-1) rather than (sp-1) and (sp-2).
Fix LD dd,(nn) and LD HL,(nn), which were performing an immediate load instead of a direct load.
Fix order-of-evaluation bug in LD (IX|IY)+d,n
Reset clears the R and I registers.
.gitignore: Ignore generated files
libz80-1.99.1