Everdrive N8: Difference between revisions

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m (→‎Software development limitations: linking forum post about open bus)
(→‎Mapper compatibilty: mappers as of v13)
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== Mapper compatibilty ==
== Mapper compatibilty ==
The OS update v11.1 in September, 2014 supports the following mappers:
 
The OS update v13 in September, 2015 supports the following mappers:


{| class="wikitable"
{| class="wikitable"
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| ---
| ---
| ---
| ---
| ---
| [[iNES Mapper 085|085]]
| [[iNES Mapper 086|086]]
| [[iNES Mapper 086|086]]
| [[iNES Mapper 087|087]]
| [[iNES Mapper 087|087]]
| [[iNES Mapper 088|088]]
| [[iNES Mapper 088|088]]
| [[iNES Mapper 089|089]]
| [[iNES Mapper 089|089]]
| ---
| [[iNES Mapper 090|090]]
| [[iNES Mapper 091|091]]
| [[iNES Mapper 091|091]]
| [[iNES Mapper 092|092]]
| [[iNES Mapper 092|092]]
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| ---
| ---
| ---
| ---
| [[iNES Mapper 146|146]]
| ---
| ---
| [[iNES Mapper 148|148]]
| ---
| ---
| ---
| [[iNES Mapper 150|150]]
| ---
| ---
| [[iNES Mapper 151|151]]
| [[iNES Mapper 151|151]]
| [[iNES Mapper 152|152]]
| [[iNES Mapper 152|152]]
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| ---
| ---
| ---
| ---
| ---
| [[iNES Mapper 164|164]]
| ---
| ---
| ---
| ---
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| ---
| ---
| ---
| ---
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| [[iNES Mapper 196|196]]
| ---
| ---
| ---
| ---
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| [[iNES Mapper 200|200]]
| [[iNES Mapper 200|200]]
| [[iNES Mapper 201|201]]
| [[iNES Mapper 201|201]]
| ---
| [[iNES Mapper 202|202]]
| [[iNES Mapper 203|203]]
| [[iNES Mapper 203|203]]
| ---
| ---
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| ---
| ---
| ---
| ---
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| [[iNES Mapper 211|211]]
| [[iNES Mapper 212|212]]
| [[iNES Mapper 212|212]]
| ---
| ---
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| ---
| ---
| ---
| ---
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| [[iNES Mapper 227|227]]
| ---
| ---
| ---
| ---
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| [[iNES Mapper 232|232]]
| [[iNES Mapper 232|232]]
| ---
| ---
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| [[iNES Mapper 234|234]]
| ---
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* Mapper 5 (MMC5) does not support expansion audio.
* Mapper 5 (MMC5) does not support expansion audio.
* Mapper 69 (FME-7) does not support expansion audio.
* Mapper 69 (FME-7) does not support expansion audio.
* Mapper 85 (VRC7) does not support expansion audio.


== Software development limitations ==
== Software development limitations ==

Revision as of 00:04, 11 November 2015

The Everdrive N8 is a flash cartridge made by Krikzz. It uses an FPGA to emulate a wide variety of mappers, allowing the user to store a large collection of ROMs on a single SD card and run them on an NES or Famicom.

In addition to NES ROMs, the Everdrive N8 is able to play FDS disk images.

Famicom expansion audio is supported, and on the NES version is output on the EXP 6 expansion pin on the cartridge connector as used by the PowerPak. A simple modification to the NES allows the expansion audio to be mixed with its output.

Specifications:

  • PRG size: 512 KB
  • CHR size: 512 KB

NES product: http://shop.krikzz.com/EverDrive-N8-NES-EDN8NES.htm

Famicom product: http://shop.krikzz.com/EverDrive-N8-Famicom-EDN8FAM.htm

See also: PowerPak - A similar product by RetroUSB

Mapper compatibilty

The OS update v13 in September, 2015 supports the following mappers:

000 001 002 003 004 005 --- 007 --- 009 010 011 012 013 --- 015
016 --- 018 019 --- 021 022 023 024 025 026 --- 028 --- --- ---
032 033 034 --- 036 --- 038 --- 040 041 042 --- --- --- --- 047
048 --- --- --- --- --- --- --- --- 057 058 --- --- 061 --- ---
064 065 066 067 068 069 070 071 072 073 074 075 076 077 078 079
080 --- 082 --- --- 085 086 087 088 089 090 091 092 093 094 095
096 097 --- 099 --- 101 --- --- --- --- --- 107 --- --- --- ---
112 113 --- 115 --- --- 118 119 --- --- --- --- --- --- --- ---
--- --- --- --- --- 133 --- --- --- --- --- --- 140 --- --- ---
--- --- 146 --- 148 --- 150 151 152 --- 154 --- --- --- 158 ---
--- --- --- --- 164 --- --- --- --- --- --- --- --- --- --- ---
--- --- 178 --- 180 --- 182 --- 184 185 --- --- 188 189 --- 191
--- 193 --- --- 196 --- --- --- 200 201 202 203 --- 205 206 207
--- --- --- 211 212 --- --- --- --- --- --- 219 220 --- --- ---
--- --- --- 227 --- --- --- 231 232 --- 234 --- --- --- --- ---
240 241 242 243 --- 245 246 --- --- --- --- --- --- --- --- ---

Known problems:

  • Mapper 5 (MMC5) does not support expansion audio.
  • Mapper 69 (FME-7) does not support expansion audio.
  • Mapper 85 (VRC7) does not support expansion audio.

Software development limitations

Aside from mapper incompatibility, there are minor differences between running NES programs on the Everdrive versus a traditional single-game cartridge.

  • The Everdrive does not accurately simulate power-on state. Because power-on always boots the Everdrive menu, RAM and various registers will be initialized to a consistent state before any NES ROM is chosen to run. (Reset state, however, is not affected by this problem.)
  • Open bus behavior may be different in several memory regions that are used by the Everdrive, but would not be connected on a regular cartridge. (forum post)
  • The Everdrive is incompatible with an NES that has the CopyNES modification installed, due to a bus conflict with its boot code.

Everdrive development resources

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