z80 timing... 6502 timing

From: Allison J Parent <allisonp_at_world.std.com>
Date: Sat Apr 17 16:39:34 1999

<What were the Z80 instructions? I'd like to test them on a SBC and documen
<them for the future.
<Thanks,
<-Dave

Found this on my disk. Allison
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Undocumented Z80 Instructions (apply only to Z80)
The Z80 IX/IY operators are missing (byte ops)


mnemonic: IN ,(C)
 OP code: 0EDh,070h
Description:
Same as IN A,(C) except the A register isn't changed (flags are
set as if it was changed).
NOTES:
This instruction can be used to test and discard the value of a
port without destroying any registers.

mnemonic: SLAS B
 OP code: 0CBh,030h
Description:
Shift Left Arithmetic Special B. Same as SLA B except bit 0 of B
is set instead of cleared.

mnemonic: SLAS C
 OP code: 0CBh,031h
Description:
Shift Left Arithmetic Special C. Same as SLA C except bit 0 of C
is set instead of cleared.

mnemonic: SLAS D
 OP code: 0CBh,032h
Description:
Shift Left Arithmetic Special D. Same as SLA D except bit 0 of D
is set instead of cleared.

mnemonic: SLAS E
 OP code: 0CBh,033h
Description:
Shift Left Arithmetic Special E. Same as SLA E except bit 0 of E
is set instead of cleared.

mnemonic: SLAS H
 OP code: 0CBh,034h
Description:
Shift Left Arithmetic Special H. Same as SLA H except bit 0 of H
is set instead of cleared.

mnemonic: SLAS L
 OP code: 0CBh,035h
Description:
Shift Left Arithmetic Special L. Same as SLA L except bit 0 of L
is set instead of cleared.

mnemonic: SLAS (HL)
 OP code: 0CBh,036h
Description:
Shift Left Arithmetic Special (HL). Same as SLA (HL) except bit 0
of (HL) is set instead of cleared.

mnemonic: SLAS A
 OP code: 0CBh,037h
Description:
Shift Left Arithmetic Special A. Same as SLA A except bit 0 of A
is set instead of cleared.
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Received on Sat Apr 17 1999 - 16:39:34 BST