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Synchronous Address Multiplexer: Difference between revisions
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m (I think the '783 and the 6883 were always the same) |
(added link to Stewart Orchard's 256K banker board project) |
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* SN74LS785 - used in CoCo 2B | * SN74LS785 - used in CoCo 2B | ||
* [http://www.cocovga.com/documentation/sam-accelerator/ SAM Accelerator] - an accelerated SAM allowing RAM refresh during full double-speed clock mode on CoCo 1/2 (may require upgraded PIAs too) | * [http://www.cocovga.com/documentation/sam-accelerator/ SAM Accelerator] - an accelerated SAM allowing RAM refresh during full double-speed clock mode on CoCo 1/2 (may require upgraded PIAs too) | ||
* [https://gitlab.com/sixxie/samx4 SAMX4] - CPLD-based SAM replacement with additional | * [https://gitlab.com/sixxie/samx4 SAMX4] - CPLD-based SAM replacement with additional [https://gitlab.com/sorchard001/dragon-256k-banker-board 256K banking] | ||
* TCC1014 1986 - the 1986 version of the ACVC / GIME replaces and includes much of the SAM functionality for CoCo 1/2 backwards compatibility support | * TCC1014 1986 - the 1986 version of the ACVC / GIME replaces and includes much of the SAM functionality for CoCo 1/2 backwards compatibility support | ||
* TCC1014 1987 - the 1987 version of the ACVC / GIME also replaces and includes much of the SAM functionality for CoCO 1/2 backwards compatibility support | * TCC1014 1987 - the 1987 version of the ACVC / GIME also replaces and includes much of the SAM functionality for CoCO 1/2 backwards compatibility support | ||
Latest revision as of 15:42, 27 December 2023
Synchronous Address Multiplexer
Supports the MC6809/HD6309 MPU interleaving memory access with the MC6847/MC6847T1 VDG and the dynamic RAM refresh cycles.
Variants
- SN74LS783 / MC6883 - used in CoCo 1/2
- SN74LS785 - used in CoCo 2B
- SAM Accelerator - an accelerated SAM allowing RAM refresh during full double-speed clock mode on CoCo 1/2 (may require upgraded PIAs too)
- SAMX4 - CPLD-based SAM replacement with additional 256K banking
- TCC1014 1986 - the 1986 version of the ACVC / GIME replaces and includes much of the SAM functionality for CoCo 1/2 backwards compatibility support
- TCC1014 1987 - the 1987 version of the ACVC / GIME also replaces and includes much of the SAM functionality for CoCO 1/2 backwards compatibility support