Johnnyo: fixing some formatting

2026-08-01T21:55:36Z

fixing some formatting

← Older revision		Revision as of 22:55, 1 August 2026
Line 18:		Line 18:
	* divmmc automatically maps itself in when instruction fetches hit specific addresses in the rom. When this happens, the esxdos rom (or divmmc bank 3 if mapram is set) appears in 0K-8K and the selected divmmc bank appears as ram in 8K-16K.		* divmmc automatically maps itself in when instruction fetches hit specific addresses in the rom. When this happens, the esxdos rom (or divmmc bank 3 if mapram is set) appears in 0K-8K and the selected divmmc bank appears as ram in 8K-16K.

	* bit 6 can only be set, once set only a power cycle can reset it on the original divmmc.		* bit 6 can only be set, once set only a power cycle can reset it on the original divmmc. nextreg 0x09 bit 3 can be set to reset this bit.
	nextreg 0x09 bit 3 can be set to reset this bit.


	The divmmc has been enhanced in the zx next to add more entry points and make them programmable.		The divmmc has been enhanced in the zx next to add more entry points and make them programmable.
	See nextreg 0xB8 - 0xBB.		See nextreg 0xB8 - 0xBB.

Em00k: Created page with "{{Port |Number=$E3 |NumberDec=227 |ShortDesc=Divmmc control |Readable=Yes |Writable=Yes |Subsystem=DIVMMC }} 0xE3 Divmmc control (R/W) :bit 7 = conmem = 1 to map in divmmc..."

2022-07-01T22:08:58Z

Created page with "{{Port |Number=$E3 |NumberDec=227 |ShortDesc=Divmmc control |Readable=Yes |Writable=Yes |Subsystem=DIVMMC }} 0xE3 Divmmc control (R/W) :bit 7 = conmem = 1 to map in divmmc..."

New page

{{Port
|Number=$E3
|NumberDec=227
|ShortDesc=Divmmc control
|Readable=Yes
|Writable=Yes
|Subsystem=DIVMMC
}}
0xE3 Divmmc control

(R/W)
:bit 7 = conmem = 1 to map in divmmc, 0K-8K will contain the esxdos rom, 8K-16K will contain the selected divmmc bank
:bit 6 = mapram = 1 to replace the esxdos rom with divmmc bank 3
:bits 3:0 = bank = selected divmmc ram bank for 8K-16K region

* conmen can be used to manually control divmmc mapping.

* divmmc automatically maps itself in when instruction fetches hit specific addresses in the rom. When this happens, the esxdos rom (or divmmc bank 3 if mapram is set) appears in 0K-8K and the selected divmmc bank appears as ram in 8K-16K.

* bit 6 can only be set, once set only a power cycle can reset it on the original divmmc.
nextreg 0x09 bit 3 can be set to reset this bit.

The divmmc has been enhanced in the zx next to add more entry points and make them programmable.
See nextreg 0xB8 - 0xBB.

DIVMMC - Revision history

Johnnyo: fixing some formatting

Em00k: Created page with "{{Port |Number=$E3 |NumberDec=227 |ShortDesc=Divmmc control |Readable=Yes |Writable=Yes |Subsystem=DIVMMC }} 0xE3 Divmmc control (R/W) :bit 7 = conmem = 1 to map in divmmc..."