AMROM: Difference between revisions
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== Banks == | == Banks == | ||
* CPU $8000-$ffff : 32 KB Switchable PRG ROM bank. | * CPU $8000-$ffff : 32 KB Switchable PRG ROM bank. | ||
The AMROM board always | The AMROM board always has 4 PRG ROM banks. | ||
== Solder pad config == | == Solder pad config == | ||
| Line 38: | Line 38: | ||
------- | ------- | ||
This pinout is not compatible with standard 27C010 EPROMs | This pinout is not compatible with standard 27C010 EPROMs. To insert them, manual rewiring is required. | ||
* CHR-RAM - 64 | * CHR-RAM - 64 KBit (8 KB x 8) (DIP-28) : Standard [[6264_static_ram|6264]] pinout. | ||
* 74HC161 (DIP-16) | * 74HC161 (DIP-16) | ||
Revision as of 14:03, 25 June 2010
AMROM refers to the NES-AMROM and HVC-AMROM boards of the AxROM category.
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 conflicts: Yes
Banks
- CPU $8000-$ffff : 32 KB Switchable PRG ROM bank.
The AMROM board always has 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. To insert them, manual rewiring is required.
- CHR-RAM - 64 KBit (8 KB x 8) (DIP-28) : Standard 6264 pinout.
- 74HC161 (DIP-16)
