NEO mapper v1 - Revision history

Aoineko: Aoineko moved page NEO mapper to NEO mapper v1 without leaving a redirect

2024-01-03T00:02:14Z

Aoineko moved page NEO mapper to NEO mapper v1 without leaving a redirect

2023-12-11T23:07:54Z

2023-12-09T00:20:39Z

‎Principles

2023-12-08T22:00:49Z

2023-12-08T22:00:32Z

‎Segment switching address format

2023-12-08T21:59:41Z

‎Segment switching address format

2023-12-08T21:58:49Z

‎Format

2023-12-08T21:12:58Z

‎Appendix

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2023-12-08T08:33:20Z

‎MSXgl

← Older revision		Revision as of 23:07, 11 December 2023
Line 144:		Line 144:
	SET_BANK_SEGMENT(1, 30);		SET_BANK_SEGMENT(1, 30);

−	[[Category:Proposal]]	+	[[Category:Proposal]][[Category:Proposal/Mapper]]

@@ Line 6: / Line 6: @@
 Like conventional mappers, the basic idea is to use data write signals to the cartridge to change the value of the ROM segment visible in each of the mapper's banks (sub-pages). So, predefined addresses can be used to write to the mapper registers (see [[#Format|tables below]]).
-Read accesses, however, work as normal accesses to the memory visible in the banks.
+Read accesses, however, work as normal accesses to the memory visible through the banks.
 Compared to conventional mappers, this proposal is based on two new main features:

@@ Line 103: / Line 103: @@
 ! 7 || 6 || 5 || 4 || 3 || 2 || 1 || 0
 |-
-| P || P || x || x || x || B || B || B || x || x || x || x || x || x || x || R
+| P || P || x || x || x || B || B || B || || x || x || x || x || x || x || x || R
 |}
 Where:

@@ Line 103: / Line 103: @@
 ! 7 || 6 || 5 || 4 || 3 || 2 || 1 || 0
 |-
-|colspan="2"| PAGE
+| P || P || x || x || x || B || B || B || x || x || x || x || x || x || x || R
 |}
 Where:

@@ Line 103: / Line 103: @@
 ! 7 || 6 || 5 || 4 || 3 || 2 || 1 || 0
 |-
-| P || P || x || x || x || B || B || B
+|colspan="2"| PAGE
+|
 | x || x || x || x || x || x || x || R

← Older revision	Revision as of 00:02, 3 January 2024
(No difference)

@@ Line 41: / Line 41: @@
 Write access to the mapper is use to change the value of the segment switching register of each bank.
 Here is the list of the predefined segment switching addresses.
 === NEO-8 mapper ===

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 == Appendix ==
 === Bank switching cost ===
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   INC HL      ;  7 t-states
   LD (HL),D   ;  8 t-states
 === MSXgl ===

@@ Line 5: / Line 5: @@
 This mapper format is designed to facilitate the creation of MSX games, not only by increasing the size of the ROM available for content, but also by offering programmers new possibilities for organizing their code and data.
-It is based on two new features compared to conventional mappers:
+Like conventional mappers, the basic idea is to use data write signals to the cartridge to change the value of the ROM segment visible in each of the mapper's banks (sub-pages). So, predefined addresses can be used to write to the mapper registers (see [[#Format|tables below]]).
 * A 16-bit segment register,
 * Banks covering all 4 pages of MSX memory space.
@@ Line 36: / Line 39: @@
 == Format ==
-Write access to the mapper is use to change the value of the segment switching register of each bank. The address is decided as:
+Write access to the mapper is use to change the value of the segment switching register of each bank.
+Here is the list of the predefined segment switching addresses.
 === NEO-8 mapper ===
@@ Line 125: / Line 111: @@
   INC HL      ;  7 t-states
   LD (HL),D   ;  8 t-states
 === MSXgl ===

@@ Line 128: / Line 128: @@
 === MSXgl ===
-MSXgl uses macros to encapsulate bank switching mechanisms. It would therefore be totally transparent for a user to switch, for example, from an ASCII8 or even Konami-SCC mapper, to an NEO-8 mapper.
+MSXgl uses macros to wrap bank switching mechanisms. It would therefore be totally transparent for a user to switch, for example, from an ASCII8 or even Konami-SCC mapper, to an NEO-8 mapper.
   #define SET_BANK_SEGMENT(bank, segment) /* ... */