NEO-253: Difference between revisions

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(Finished MV4F pinouts)
 
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Quintuple 74HC253 4-to-1 multiplexers with common select lines, making 10 switches in one chip.
Quintuple 74HC253 4-to-1 multiplexers with common select lines, making ten 4-to-1 switches in one chip. Used to switch read-only buses. The inputs are named according to the related slot: A is slot #1, B is slot #2...


Only (?) used on second revision 4-slot MVS systems. Not to be confused with the more common {{Chipname|NEO-273}}.
Only (?) used on second revision 4-slot MVS systems. Not to be confused with the more common {{Chipname|NEO-273}}.
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Select signals come from {{Chipname|NEO-F0}} SLOTA and SLOTB.
Select signals come from {{Chipname|NEO-F0}} SLOTA and SLOTB.


Todo: 10 and 42 are GND
==SLOT4F @ 5E==


==SLOT4F @ 5E==
Cartridge [[wait cycle]] configuration and [[Z80]] bus.


*Mux 1: PWAIT0
*Mux 2: PWAIT1
*Mux 10~3: SDD7~SDD0
*Mux 10~3: SDD7~SDD0
*Mux 2: PWAIT1
 
*Mux 1: PWAIT0
Outputs go to CN9.
*Outputs go to CN9


==SLOT4F @ 5D==
==SLOT4F @ 5D==
[[Sprites]] and [[fix layer]] graphics.
*Mux 1: CR30
*Mux 2: CR31
*Mux 10~3: FIXD7~FIXD0
==SLOT4F @ 5C==
==SLOT4F @ 5C==
Sprite graphics.
*Mux 10~1: CR29~CR20
==SLOT4F @ 5B==
==SLOT4F @ 5B==
Sprite graphics.
*Mux 10~1: CR19~CR10
==SLOT4F @ 5A==
==SLOT4F @ 5A==
Sprite graphics.
*Mux 10~1: CR9~CR0


[[Category:Chips]]
[[Category:Chips]]

Latest revision as of 17:07, 18 September 2017

Package QFP64R
Manufacturer
First use 1992 ?
Used on SLOT4F

Quintuple 74HC253 4-to-1 multiplexers with common select lines, making ten 4-to-1 switches in one chip. Used to switch read-only buses. The inputs are named according to the related slot: A is slot #1, B is slot #2...

Only (?) used on second revision 4-slot MVS systems. Not to be confused with the more common NEO-273.

Pinout

OpenOffice Draw file: File:Neo-253.odg

Select signals come from NEO-F0 SLOTA and SLOTB.

SLOT4F @ 5E

Cartridge wait cycle configuration and Z80 bus.

  • Mux 1: PWAIT0
  • Mux 2: PWAIT1
  • Mux 10~3: SDD7~SDD0

Outputs go to CN9.

SLOT4F @ 5D

Sprites and fix layer graphics.

  • Mux 1: CR30
  • Mux 2: CR31
  • Mux 10~3: FIXD7~FIXD0

SLOT4F @ 5C

Sprite graphics.

  • Mux 10~1: CR29~CR20

SLOT4F @ 5B

Sprite graphics.

  • Mux 10~1: CR19~CR10

SLOT4F @ 5A

Sprite graphics.

  • Mux 10~1: CR9~CR0