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#!/usr/bin/env python
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#!/usr/bin/env python3
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#
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#
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# This script simulates 'sbc' calculation and generates values for selected numbers.
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# This script simulates 'sbc' calculation and generates values for selected numbers.
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# These can be compared with a real Z80 run values.
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# These can be compared with a real Z80 run values.
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#
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#
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import sys
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import sys
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Line 37... |
s += ' '
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s += ' '
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if f & (1 << 0):
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if f & (1 << 0):
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s += 'C'
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s += 'C'
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else:
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else:
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s += ' '
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s += ' '
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print 'Flags = %s' % s
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print ('Flags = %s' % s)
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def sbc(inA, op2, CYin):
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def sbc(inA, op2, CYin):
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print '------------------------------------------'
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print ('------------------------------------------')
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print 'Input: %0.2X SBC %0.2X CY = %0.2X' % ( inA, op2, CYin)
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print ('Input: %0.2X SBC %0.2X CY = %0.2X' % ( inA, op2, CYin))
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double_cpl = 0 # Flag that we did a double 1's complement
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double_cpl = 0 # Flag that we did a double 1's complement
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cplOp2 = op2 ^ 0xFF # Bit-wise complement of OP2
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cplOp2 = op2 ^ 0xFF # Bit-wise complement of OP2
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if CYin: # If CF was set, we'll also use complemented ACCT
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if CYin: # If CF was set, we'll also use complemented ACCT
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Line 89... |
vf = (carry_ins>>7)&1 # VF = Internal carry from bit [6] to [7]
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vf = (carry_ins>>7)&1 # VF = Internal carry from bit [6] to [7]
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vf ^= cf # XOR'ed with the final carry out
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vf ^= cf # XOR'ed with the final carry out
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flags = (sf<<7) | (zf<<6) | (yf<<5) | (hf<<4) | (xf<<3) | (vf<<2) | (nf<<1) | (cf<<0)
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flags = (sf<<7) | (zf<<6) | (yf<<5) | (hf<<4) | (xf<<3) | (vf<<2) | (nf<<1) | (cf<<0)
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print 'Out: A -> %0.2X Flags = %0.2X' % ( finalA, flags)
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print ('Out: A -> %0.2X Flags = %0.2X' % ( finalA, flags))
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printFlags(flags)
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printFlags(flags)
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sbc(0, 0, 0)
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sbc(0, 0, 0)
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print 'Should be A -> 00 Flags = 42'
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print ('Should be A -> 00 Flags = 42')
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printFlags(0x42)
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printFlags(0x42)
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sbc(0, 1, 0)
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sbc(0, 1, 0)
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print 'Should be A -> FF Flags = BB'
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print ('Should be A -> FF Flags = BB')
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printFlags(0xBB)
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printFlags(0xBB)
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sbc(0, 0, 1)
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sbc(0, 0, 1)
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print 'Should be A -> FF Flags = BB'
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print ('Should be A -> FF Flags = BB')
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printFlags(0xBB)
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printFlags(0xBB)
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sbc(0, 1, 1)
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sbc(0, 1, 1)
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print 'Should be A -> FE Flags = BB'
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print ('Should be A -> FE Flags = BB')
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printFlags(0xBB)
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printFlags(0xBB)
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sbc(0xAA, 0x55, 0)
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sbc(0xAA, 0x55, 0)
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print 'Should be A -> 55 Flags = 06'
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print ('Should be A -> 55 Flags = 06')
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printFlags(0x06)
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printFlags(0x06)
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sbc(0x55, 0xAA, 0)
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sbc(0x55, 0xAA, 0)
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print 'Should be A -> AB Flags = BF'
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print ('Should be A -> AB Flags = BF')
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printFlags(0xBF)
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printFlags(0xBF)
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sbc(0xAA, 0x55, 1)
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sbc(0xAA, 0x55, 1)
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print 'Should be A -> 54 Flags = 06'
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print ('Should be A -> 54 Flags = 06')
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printFlags(0x06)
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printFlags(0x06)
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sbc(0x55, 0xAA, 1)
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sbc(0x55, 0xAA, 1)
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print 'Should be A -> AA Flags = BF'
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print ('Should be A -> AA Flags = BF')
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printFlags(0xBF)
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printFlags(0xBF)
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sbc(0x0F, 0x03, 1)
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sbc(0x0F, 0x03, 1)
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print 'Should be A -> 0B Flags = 0A'
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print ('Should be A -> 0B Flags = 0A')
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printFlags(0x0A)
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printFlags(0x0A)
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No newline at end of file
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No newline at end of file
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