Famicom Network System: Revision history

6 June 2024

• curprev 23:3523:35, 6 June 2024‎ Ben Boldt talk contribs‎ m 144,684 bytes +90‎ →‎Data Bus Behavior
• curprev 23:2723:27, 6 June 2024‎ Ben Boldt talk contribs‎ 144,594 bytes +315‎ →‎LH5323M1 Kanji Graphic ROM: Kanji ROM data access details.
• curprev 23:1723:17, 6 June 2024‎ Ben Boldt talk contribs‎ 144,279 bytes +164‎ →‎RF5C66 Mapper and Disk Drive Controller: Noting that Kanji ROM /CE does go low for writes in the range $5000-5FFF, thereby preventing a card putting multi-mapper supervisor registers there ala mindkids/coolgirl.

28 May 2024

• curprev 17:4817:48, 28 May 2024‎ Ben Boldt talk contribs‎ 144,115 bytes +1,141‎ - Updated naming of CIC signals. Verified $40C0 bits 7, 1, and 0 were listed correctly.

27 May 2024

• curprev 21:0221:02, 27 May 2024‎ Ben Boldt talk contribs‎ m 142,974 bytes +18‎ →‎Pinouts
• curprev 20:5220:52, 27 May 2024‎ Ben Boldt talk contribs‎ m 142,956 bytes 0‎ →‎8634A Tsuushin Card CIC Lock Chip

26 May 2024

• curprev 21:4021:40, 26 May 2024‎ Ben Boldt talk contribs‎ 142,956 bytes +45‎ →‎8633 Famicom Network System CIC Key Chip: Update names of pins 10,11,12,15.
• curprev 21:3821:38, 26 May 2024‎ Ben Boldt talk contribs‎ 142,911 bytes +217‎ →‎RF5C66 Mapper and Disk Drive Controller: Updated errors about CIC pins 29,31,32.

25 May 2024

• curprev 12:4812:48, 25 May 2024‎ Quietust talk contribs‎ m 142,694 bytes 0‎ from

24 May 2024

• curprev 22:0822:08, 24 May 2024‎ Ben Boldt talk contribs‎ 142,694 bytes +724‎ →‎Pinouts: Updated CIC pinouts.

23 May 2024

• curprev 22:2722:27, 23 May 2024‎ Ben Boldt talk contribs‎ m 141,970 bytes 0‎ →‎P2: Tsuushin Card Connector: Same data direction change in the Tuushin card pinout.
• curprev 22:2522:25, 23 May 2024‎ Ben Boldt talk contribs‎ m 141,970 bytes 0‎ →‎Pinouts: Updated the data directions of pins 1 and 2 of the CIC chips. I verified this by taping the applicable pins on the edge connector and probing on the card. CIC Pin 1 was an output on the card, in keeping with NES CIC chips.
• curprev 00:4000:40, 23 May 2024‎ Ben Boldt talk contribs‎ 141,970 bytes +103‎ →‎Data Bus Behavior: Added measurement of buffer propagation delay.
• curprev 00:3900:39, 23 May 2024‎ Ben Boldt talk contribs‎ m 141,867 bytes +51‎ →‎RF5C66 Mapper and Disk Drive Controller: Added detail in pinout for pin 29 affecting Card R/W.
• curprev 00:3700:37, 23 May 2024‎ Ben Boldt talk contribs‎ 141,816 bytes +504‎ →‎Data Bus Behavior: Added note about CIC preventing writes, how that may apply to the data bus buffer.
• curprev 00:2400:24, 23 May 2024‎ Ben Boldt talk contribs‎ 141,312 bytes +101‎ →‎System Overview: Added info about CPU R/W being buffered similar to the data bus, and how that is affected by CIC failure and the lid switch.

17 May 2024

• curprev 17:0917:09, 17 May 2024‎ Ben Boldt talk contribs‎ 141,211 bytes +138‎ →‎P2: Tsuushin Card Connector: Added note about 0.04" pin pitch. When I eventually have a working card, I will provide better info.

30 April 2024

• curprev 23:4523:45, 30 April 2024‎ Ben Boldt talk contribs‎ m 141,073 bytes +270‎ "card" -> "tsuushin card", "NES" -> "Famicom". Added external links.

18 February 2023

• curprev 16:4216:42, 18 February 2023‎ NewRisingSun talk contribs‎ 140,803 bytes +73‎ Consistent spelling of CHR RAM/CHR-RAM, make clear that there are two 8 KiB chips

27 August 2022

• curprev 16:3816:38, 27 August 2022‎ Ben Boldt talk contribs‎ m 140,730 bytes +22‎ →‎Data Bus Behavior: Added note, Kanji ROM /CE pin.

11 August 2022

• curprev 17:5517:55, 11 August 2022‎ Ben Boldt talk contribs‎ 140,708 bytes +607‎ Removed unnecessary "1=" from yes/no table cell style templates. Added unknown/unconfirmed register $40A0 (placeholder).

12 July 2022

• curprev 06:0306:03, 12 July 2022‎ Ben Boldt talk contribs‎ m 140,101 bytes +36‎ →‎Data Bus Behavior
• curprev 05:5605:56, 12 July 2022‎ Ben Boldt talk contribs‎ 140,065 bytes +150‎ →‎Data Bus Behavior: expanded first row of table into 3 separate rows.
• curprev 05:4105:41, 12 July 2022‎ Ben Boldt talk contribs‎ 139,915 bytes +86‎ →‎Data Bus Behavior: noted Kanji graphic ROM in table.

10 July 2022

• curprev 20:4720:47, 10 July 2022‎ Ben Boldt talk contribs‎ m 139,829 bytes +21‎ →‎Data Bus Behavior: clarification
• curprev 20:4220:42, 10 July 2022‎ Ben Boldt talk contribs‎ 139,808 bytes −315‎ Re-tested RF5C66 pins 41 and 42, and found that they are NOT mirrored at $Cxxx. Mystery solved. Not sure what I was seeing before.
• curprev 15:4015:40, 10 July 2022‎ Ben Boldt talk contribs‎ 140,123 bytes +482‎ →‎Data Bus Behavior: added note about potential bus conflict.
• curprev 02:1902:19, 10 July 2022‎ Ben Boldt talk contribs‎ 139,641 bytes +348‎ →‎Data Bus Behavior: Corrected error where I thought the card bus was driving $00 in blocked address ranges.
• curprev 00:3300:33, 10 July 2022‎ Ben Boldt talk contribs‎ m 139,293 bytes −1‎ →‎Data Bus Behavior: typo fixes
• curprev 00:2900:29, 10 July 2022‎ Ben Boldt talk contribs‎ 139,294 bytes +234‎ →‎Data Bus Behavior: Added note about $4xE0-4xEF.
• curprev 00:1900:19, 10 July 2022‎ Ben Boldt talk contribs‎ 139,060 bytes +1,140‎ Added information about behavior of the data bus passing through the RF5C66.

8 April 2022

• curprev 22:5722:57, 8 April 2022‎ Ben Boldt talk contribs‎ m 137,920 bytes +27‎ →‎CPU2 Known Registers: clarification
• curprev 22:4622:46, 8 April 2022‎ Ben Boldt talk contribs‎ 137,893 bytes +230‎ →‎Known Registers: Improvement/clarification on register $40D6.

25 September 2021

• curprev 19:3719:37, 25 September 2021‎ Ben Boldt talk contribs‎ 137,663 bytes +1,400‎ →‎Connection Status Byte: Added remaining status bytes from Kangyou Sumimaru no Famicom Trade manual.

24 September 2021

• curprev 23:3423:34, 24 September 2021‎ Ben Boldt talk contribs‎ 136,263 bytes +1,183‎ →‎Connection Status Byte: Added Kangyou Sumimaru descriptions for status bytes 03, 04, 05
• curprev 22:3222:32, 24 September 2021‎ Ben Boldt talk contribs‎ 135,080 bytes +352‎ →‎Connection Status Byte: Added error code 01 description from Kangyou Sumimaru no Famicom Trade manual.
• curprev 20:5820:58, 24 September 2021‎ Ben Boldt talk contribs‎ 134,728 bytes +2,897‎ →‎Connection Status Byte: Completed entering Super Mario Club reference data into this section.
• curprev 20:3820:38, 24 September 2021‎ Ben Boldt talk contribs‎ 131,831 bytes +2,027‎ →‎Connection Status Byte: Additional info added from Super Mario Club manual.
• curprev 19:4319:43, 24 September 2021‎ Ben Boldt talk contribs‎ 129,804 bytes +3,108‎ →‎Connection Status Byte: Added some info from Super Mario Club manual.

23 September 2021

• curprev 20:2220:22, 23 September 2021‎ Ben Boldt talk contribs‎ 126,696 bytes +240‎ →‎Commands Written by the Famicom to CPU2: Additional notes for CPU2 command $6A, added "$413x" to names of commands $10, $11, $6A.

2 August 2021

• curprev 23:2423:24, 2 August 2021‎ Ben Boldt talk contribs‎ 126,456 bytes +477‎ →‎CPU2 Memory Map: Cleanup.
• curprev 23:0523:05, 2 August 2021‎ Ben Boldt talk contribs‎ m 125,979 bytes +215‎ →‎Pinouts: Cleanup.

14 June 2021

• curprev 23:5923:59, 14 June 2021‎ Ben Boldt talk contribs‎ m 125,764 bytes +16‎ →‎P2: Game Card Connector: Added that pin 3 is N/C in JRA-PAT.

16 May 2021

• curprev 00:4700:47, 16 May 2021‎ Ben Boldt talk contribs‎ 125,748 bytes −148‎ →‎CPU2 Known Registers: New test setup with internal ROM disabled: Confirmed $412F.7 is UART Rx IRQ Enable and writing 1 to $4112.7 acknowledges it.

15 May 2021

• curprev 21:5221:52, 15 May 2021‎ Ben Boldt talk contribs‎ 125,896 bytes +117‎ →‎RF5A18 CPU2 / Modem Controller: Details about pin 26 to disable internal ROM, also its effect on ROM /CE.

13 May 2021

• curprev 21:4421:44, 13 May 2021‎ Ben Boldt talk contribs‎ 125,779 bytes +148‎ →‎Commands Written by the Famicom to CPU2: Improved info about command $10/$90, $11/$91 responses.
• curprev 01:3701:37, 13 May 2021‎ Ben Boldt talk contribs‎ m 125,631 bytes +229‎ →‎Commands Written by the Famicom to CPU2: Cleanup command $10 collapsed table I just added, also un-bold collapsed tables in $7D to be consistent.
• curprev 01:2301:23, 13 May 2021‎ Ben Boldt talk contribs‎ 125,402 bytes +1,566‎ →‎Commands Written by the Famicom to CPU2: Added ROM data used in command $10

11 May 2021

• curprev 00:2900:29, 11 May 2021‎ Ben Boldt talk contribs‎ 123,836 bytes +2,045‎ →‎CPU2 Known Registers: Added some ROM observations of registers $413x.

10 May 2021

• curprev 05:0705:07, 10 May 2021‎ Ben Boldt talk contribs‎ 121,791 bytes +755‎ →‎CPU2 Commands: Found $90 and $91 response commands for commands $10 and $11. Confirmed command $C0 is a UART Rx packet.