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SAM
From CoCopedia - The Tandy/Radio Shack Color Computer Wiki
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 |
|---|---|---|
| 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 |
| FFC7 | VOFS1 | SAM F1 set bit to add $200 to video offset |
| FFC8 | ||
| FFC9 | VOFS2 | SAM F2 set bit to add $400 to video offset |
| FFCA | ||
| FFCB | VOFS3 | SAM F3 set bit to add $800 to video offset |
