| MediaWiki:Sitenotice |
|---|
| 2026-03-12: Cocopedia.com is now using a new caching system that should make things faster. Please let me know if you encounter any new issues.
2026-03-15: MediaWiki has been reinstalled and the old database and files restored. It was pretty clogged up from being upgraded so many times since 2004. I am also testing out Cloudflare to see if it can prevent the 'bot assaults that took the site down last year. 2026-03-16: Special thanks to Don Barber for hosting a backup mirror of CoCopedia: https://cocopedia.dgb3.net |
Synchronous Address Multiplexer: Difference between revisions
From CoCopedia - The Tandy/Radio Shack Color Computer Wiki
Jump to navigationJump to search
created initial page |
added link to Stewart Orchard's 256K banker board project |
||
| (3 intermediate revisions by the same user not shown) | |||
| Line 5: | Line 5: | ||
== Variants == | == Variants == | ||
* MC6883 | * SN74LS783 / MC6883 - used in CoCo 1/2 | ||
* SN74LS785 - used in CoCo 2B | * SN74LS785 - used in CoCo 2B | ||
* [http://www.cocovga.com/documentation/sam-accelerator/ SAM Accelerator] - an accelerated SAM allowing RAM | * [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 11:42, 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
