PRG RAM circuit: Revision history

11 February 2025

• curprev 18:2318:23, 11 February 2025‎ Ben Boldt talk contribs‎ m 10,512 bytes 0‎ →‎Battery backup: typo
• curprev 01:5201:52, 11 February 2025‎ Ben Boldt talk contribs‎ 10,512 bytes +1,014‎ →‎Battery backup: Adding info about the diodes that we were discussing in the forum. Trying to include all viewpoints on this without being too wordy.

5 June 2023

• curprev 23:0823:08, 5 June 2023‎ Lidnariq talk contribs‎ 9,498 bytes −3‎ fix up hierarchy

11 January 2023

• curprev 02:5502:55, 11 January 2023‎ Qalle talk contribs‎ 9,501 bytes +64‎ punctuation, tidy up diagram

15 July 2019

• curprev 20:5420:54, 15 July 2019‎ Lidnariq talk contribs‎ 9,437 bytes 0‎ we almost exclusively call the signal on the card edge "/ROMSEL", not "PRG /CE". Replace the latter with the former for consistency.

5 February 2019

• curprev 07:5007:50, 5 February 2019‎ Lidnariq talk contribs‎ m 9,437 bytes −65‎ protocol-relative links to forum

7 May 2017

• curprev 18:1118:11, 7 May 2017‎ Lidnariq talk contribs‎ 9,502 bytes −156‎ edit for fluidity
• curprev 14:2814:28, 7 May 2017‎ Krzysiobal talk contribs‎ 9,658 bytes 0‎ No edit summary
• curprev 14:1714:17, 7 May 2017‎ Krzysiobal talk contribs‎ 9,658 bytes +25‎ No edit summary
• curprev 14:1614:16, 7 May 2017‎ Krzysiobal talk contribs‎ 9,633 bytes +3,909‎ No edit summary

18 April 2017

• curprev 09:4109:41, 18 April 2017‎ AWJ talk contribs‎ m 5,724 bytes +9‎ No edit summary

26 July 2016

• curprev 02:0302:03, 26 July 2016‎ Lidnariq talk contribs‎ m 5,715 bytes 0‎ →‎PRG /CE delay: /ROMSEL is inverted logic...
• curprev 00:4800:48, 26 July 2016‎ Tepples talk contribs‎ 5,715 bytes +279‎ →‎PRG /CE delay: lidnariq's delay

9 June 2016

• curprev 22:2522:25, 9 June 2016‎ Lidnariq talk contribs‎ m 5,436 bytes −16‎ skip redirect

11 March 2015

• curprev 22:2322:23, 11 March 2015‎ Koitsu talk contribs‎ 5,452 bytes +1‎ →‎Battery backup
• curprev 22:2322:23, 11 March 2015‎ Koitsu talk contribs‎ 5,451 bytes +4‎ →‎References

20 November 2014

• curprev 04:2904:29, 20 November 2014‎ Tepples talk contribs‎ 5,447 bytes +34‎ →‎Using 74139: Further hedge
• curprev 03:3403:34, 20 November 2014‎ Tepples talk contribs‎ 5,413 bytes +145‎ MTPO is 74139 not 7420

19 November 2014

• curprev 06:3306:33, 19 November 2014‎ Tepples talk contribs‎ 5,268 bytes +157‎ →‎Using 7420: punch out

3 August 2012

• curprev 19:5219:52, 3 August 2012‎ Lidnariq talk contribs‎ m 5,111 bytes −52‎ links to old forum → links to new forum

23 July 2012

• curprev 07:2707:27, 23 July 2012‎ Lidnariq talk contribs‎ m 5,163 bytes +12‎ skip redirect on SRAM link

3 December 2011

• curprev 21:5521:55, 3 December 2011‎ Tepples talk contribs‎ 5,151 bytes +108‎ schematic

9 November 2011

• curprev 18:1718:17, 9 November 2011‎ Tepples talk contribs‎ 5,043 bytes +149‎ →‎Using 74139: Mapper 87 uses something like this

6 April 2011

• curprev 02:1502:15, 6 April 2011‎ Tepples talk contribs‎ 4,894 bytes +115‎ we have an article about the 6264

5 April 2011

• curprev 19:4419:44, 5 April 2011‎ Tepples talk contribs‎ m 4,779 bytes −31‎ WRAM? SRAM? Standardized terminology
• curprev 17:5717:57, 5 April 2011‎ Tepples talk contribs‎ 4,810 bytes +43‎ →‎PRG /CE delay: If the NES uses a 74139, we can match it with our own 74139, amirite?
• curprev 17:5517:55, 5 April 2011‎ Tepples talk contribs‎ m 4,767 bytes −54‎ →‎M2 and PRG /CE Race Condition: a bit of a copyedit
• curprev 13:2513:25, 5 April 2011‎ Qbradq talk contribs‎ 4,821 bytes +1,264‎ Added M2 and PRG /CE Race Condition heading to help elaborate on the $E000-$FFFF write issues

4 April 2011

• curprev 02:0902:09, 4 April 2011‎ Tepples talk contribs‎ 3,557 bytes +103‎ →‎Using 7420: kevtris agrees
• curprev 01:3201:32, 4 April 2011‎ Tepples talk contribs‎ 3,454 bytes +322‎ →‎Using 74139: With proof
• curprev 01:2701:27, 4 April 2011‎ Tepples talk contribs‎ 3,132 bytes +149‎ →‎Using 7420: and 74139

24 March 2011

• curprev 03:3003:30, 24 March 2011‎ Tepples talk contribs‎ 2,983 bytes +106‎ →‎Using 7420: further suggestions?

23 February 2011

• curprev 19:2619:26, 23 February 2011‎ Tepples talk contribs‎ 2,877 bytes −2,180‎ Removed older circuit suggestions

1 January 2011

• curprev 06:0306:03, 1 January 2011‎ Tepples talk contribs‎ 5,057 bytes +404‎ So it is the Family BASIC circuit

28 November 2010

• curprev 02:5002:50, 28 November 2010‎ Tepples talk contribs‎ 4,653 bytes +304‎ Warning from loopy

3 October 2009

• curprev 15:0215:02, 3 October 2009‎ Tepples talk contribs‎ 4,349 bytes +165‎ lead

12 June 2009

• curprev 06:2106:21, 12 June 2009‎ Banshaku talk contribs‎ m 4,184 bytes +4,184‎ Created page with 'The iNES format implies 8 KiB of PRG RAM at $6000-$7FFF, which may or may not be battery backed, even for discrete boards such as [[NROM]...'