/* Imported from Wayback Machine
   Original URL : https://retrobrewcomputers.org/doku.php?id=boards:ecb:dma:changes
   Snapshot date: 2023-02-04
   Generator    : wayback-archiver
*/

==== Table of Contents ====

[[#changes|Changes]]

[[#ecb-dma-r01|ECB-DMA-R01]]

[[#ecb-dma-r01a|ECB-DMA-R01A]]

[[#ecb-dma-r01b|ECB-DMA-R01B]]

====== Changes ======

==== ECB-DMA-R01 ====

This is the first version of the circuit that was release but not built.

[[https://retrobrewcomputers.org/lib/exe/fetch.php?media=boards:ecb:dma:ecb-dma-r01-sch.pdf|ECB-DMA-R01-sch.pdf]]

Here is the first version of the PCB:

[[https://retrobrewcomputers.org/lib/exe/fetch.php?media=boards:ecb:dma:ecb-dma-r01-brd.pdf|ECB-DMA-R01-brd.pdf]]

[[https://www.retrobrewcomputers.org/lib/exe/fetch.php?tok=46876e&media=https://www.retrobrewcomputers.org/lib/plugins/ckgedit/fckeditor/userfiles/image/boards/ecb/dma/ecb-dma-r01.jpg|{{https://retrobrewcomputers.org/lib/exe/fetch.php?w=300&h=164&tok=27a828&media=https%3A%2F%2Fwww.retrobrewcomputers.org%2Flib%2Fplugins%2Fckgedit%2Ffckeditor%2Fuserfiles%2Fimage%2Fboards%2Fecb%2Fdma%2Fecb-dma-r01.jpg?300x164|www.retrobrewcomputers.org_lib_plugins_ckgedit_fckeditor_userfiles_image_boards_ecb_dma_ecb-dma-r01.jpg}}]]

==== ECB-DMA-R01A ====

The first reinvented board based on Wolfgang's original circuit. An activity light was added with selectable jumper for device selection or DMA activity monitoring and trouble shooting. The activity light circuit was taken directly from Wolfgang's Ramfloppy design.

R01A gerbers are [[https://retrobrewcomputers.org/lib/exe/fetch.php?media=boards:ecb:dma:ecb-dma-r01a-gerbers.zip|here]].

R01A Kicad files are [[https://retrobrewcomputers.org/lib/exe/fetch.php?media=boards:ecb:dma:ecb-dma-r01a.zip|here.]]

Errata : The output of U6b pin 6 must be inverted before pin 1 of U10. i.e. the direction signal is incorrect. Updated in version 001B

SW2 should be jumpered 1-3 on the primary DMA board

SW2 should be jumpered 2-4 on all other (secondary) boards.

[[https://www.retrobrewcomputers.org/lib/exe/fetch.php?tok=23f52e&media=https://www.retrobrewcomputers.org/lib/plugins/ckgedit/fckeditor/userfiles/image/boards/ecb/dma/gallery/ecb-dma-r01a.png|{{https://retrobrewcomputers.org/lib/exe/fetch.php?w=450&h=220&tok=539fb3&media=https%3A%2F%2Fwww.retrobrewcomputers.org%2Flib%2Fplugins%2Fckgedit%2Ffckeditor%2Fuserfiles%2Fimage%2Fboards%2Fecb%2Fdma%2Fgallery%2Fecb-dma-r01a.png?450x220}}]]

==== ECB-DMA-R01B ====

Under [[boards:ecb:dma:development|development]]

Corrects missing inverter.

Change jumper headers.

Silk screen improvements.

Routing changes.