NES:Famicom Disk System Glitching Sprites Fix: Difference between revisions
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Certain combinations of Famicom and Famicom Disk System (FDS) RAM adapter units have an issue which causes sprites to appear glitchy due to interference on the FDS RAM cart pins. The issue seems to affect mostly Famicoms made in 1989 and RAM adapters with boards marked "HVC-FMR-03" and some early "HVC-FMR-02" boards. Information for this guide was compiled from multiple sources.<ref>https://retro.supermegabyte.com/2018/07/23/fix-glitchy-famicom-disk-system-sprites/</ref><ref>https://www.famicomworld.com/forum/index.php?topic=10607.0</ref><ref>https://synt4x.org/blog/index.php/2018/01/19/glitchy-graphics-on-famicom-disk-system/</ref> | Certain combinations of Famicom and Famicom Disk System (FDS) RAM adapter units have an issue which causes sprites to appear glitchy due to interference on the FDS RAM cart pins. The issue seems to affect mostly Famicoms made in 1989 and RAM adapters with boards marked "HVC-FMR-03" and some early "HVC-FMR-02" boards. Information for this guide was compiled from multiple sources.<ref>https://retro.supermegabyte.com/2018/07/23/fix-glitchy-famicom-disk-system-sprites/</ref><ref>https://www.famicomworld.com/forum/index.php?topic=10607.0</ref><ref>https://synt4x.org/blog/index.php/2018/01/19/glitchy-graphics-on-famicom-disk-system/</ref><ref>https://twitter.com/SuperZvesda/status/1639694888944951297</ref> | ||
== Solution == | == Solution == | ||
The solution is to add | The solution is to add resistors on the data pins of the FDS RAM cart unit, which fixes the interference. | ||
# Obtain a [https://www.arcadepartsandrepair.com/store/components/resistors/4-7k-ohm-resistor-network-9-pin-bussed-r1105/ 9-pin 4.7kohm resistor array]. | # Obtain a [https://www.arcadepartsandrepair.com/store/components/resistors/4-7k-ohm-resistor-network-9-pin-bussed-r1105/ 9-pin 4.7kohm resistor array]. | ||
Revision as of 15:22, 26 March 2023
Certain combinations of Famicom and Famicom Disk System (FDS) RAM adapter units have an issue which causes sprites to appear glitchy due to interference on the FDS RAM cart pins. The issue seems to affect mostly Famicoms made in 1989 and RAM adapters with boards marked "HVC-FMR-03" and some early "HVC-FMR-02" boards. Information for this guide was compiled from multiple sources.[1][2][3][4]
Solution
The solution is to add resistors on the data pins of the FDS RAM cart unit, which fixes the interference.
- Obtain a 9-pin 4.7kohm resistor array.
- Alternatively, you can use eight 4.7kohm resistors.
- Use electrical tape to line up the resistor array as shown and hold it in place.
- Bend the first pin of the resistor array upwards so that it doesn't make contact with anything on the board.
- Solder a wire between the first pin and ground.
- Solder pin 2 of the resistor array to pin 6 of the FDS RAM adapter.
- Solder the remaining pins of the resistor array to the FDS RAM adapter pins. Pins 6-13 should all be soldered to.