AMROM: Difference between revisions

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'''AMROM''' refers to the NES-AMROM and HVC-AMROM boards of the [[AxROM]] category.
#REDIRECT [[AxROM]]
 
== Overview ==
* PRG ROM size: 128 KB
* PRG ROM bank size: 32 KB
* PRG RAM: None
* CHR capacity: 8 KB RAM
* CHR bank size: Not bankswitched
* Nametable [[mirroring]]: Single-screen, mapper-selectable
* Subject to [[bus conflict]]s: Yes
 
== Banks ==
* CPU $8000-$ffff : 32 KB Switchable PRG ROM bank.
The AMROM board always have 4 PRG ROM banks.
 
== Solder pad config ==
No solder pad config is needed on the AMROM board.
 
== Chips and pinout ==
 
* PRG ROM - 1 MBit (128 KB x 8) (DIP-28) :
 
                        ---U---
                A15 - |01  28| - +5V
                A12 - |02  27| - A14
                A7  - |03  26| - A13
                A6  - |04  25| - A8
                A5  - |05  24| - A9
                A4  - |06  23| - A11
                A3  - |07  22| - A16
                A2  - |08  21| - A10
                A1  - |09  20| - /CE (/ROMSEL)
                A0  - |10  19| - D7
                D0  - |11  18| - D6
                D1  - |12  17| - D5
                D2  - |13  16| - D4
                GND - |14  15| - D3
                        -------
 
This pinout is not compatible with standard 27C010 EPROMs, so to insert them in the board manual rewiring is needed.
 
* CHR-RAM - 64 kBit (8 KB x 8) (DIP-28) : Standard [[6264_static_ram|6264]] pinout.
 
* 74HC161 (DIP-16)

Latest revision as of 20:38, 24 November 2010

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