Difference between revisions of "Alternate ROM"

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(core 3.0.5 changes/refresh)
 
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| 0 || 1 to lock 48k ROM
 
| 0 || 1 to lock 48k ROM
 
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|}
 +
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Set to 0 upon hard reset.
  
 
(new register since core 3.0.5)
 
(new register since core 3.0.5)
  
 
(note: Next registers with number higher than $7F are inaccessible from Copper code)
 
(note: Next registers with number higher than $7F are inaccessible from Copper code)

Revision as of 22:46, 4 December 2019

Number $8C
Readable Yes
Writable Yes
Short Description Enable alternate ROM or lock 48k ROM
Bit Description
Values affecting machine immediately
7 1 to enable alternate ROM
6 1 to make alternate ROM visible only during writes, 0 to make alternate ROM visible during reads
4 1 to lock 48k ROM
After soft reset (will be copied to bits 7-4)
3 1 to enable alternate ROM
2 1 to make alternate ROM visible only during writes, 0 to make alternate ROM visible during reads
0 1 to lock 48k ROM

Set to 0 upon hard reset.

(new register since core 3.0.5)

(note: Next registers with number higher than $7F are inaccessible from Copper code)