MediaWiki:Sitenotice:
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SAM
The SAM or Synchronous Address Multiplexer is a chip that controls access to RAM memory by the 6809 CPU and the VDG (Video Display Generator).
SAM Registers
| Address | Shorthand name | Function | Effect |
|---|---|---|---|
| FFC0 | V2CLR | SAM V2 bit clear | |
| FFC1 | V2SET | SAM V2 bit set | |
| FFC2 | V1CLR | SAM V1 bit clear | |
| FFC3 | V1SET | SAM V1 bit set | |
| FFC4 | V0CLR | SAM V0 bit clear | |
| FFC5 | V0SET | SAM V0 bit set | |
| FFC6 | F0CLR | SAM F0 bit clear | |
| FFC7 | F0SET | SAM F0 set bit | add $200 to video offset |
| FFC8 | |||
| FFC9 | F1SET | SAM F1 set bit | add $400 to video offset |
| FFCA | SAM F2 bit clear | ||
| FFCB | F2SET | SAM F2 set bit | add $800 to video offset |
| FFCC | |||
| FFCD | $1000 | ||
| FFCE | |||
| FFCF | $2000 | ||
| FFD0 | |||
| FFD1 | $4000 | ||
| FFD2 | |||
| FFD3 | $8000 |