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   Original URL : https://retrobrewcomputers.org/doku.php?id=builderpages:plasmo:k80:k80rev1:prek80r1
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==== Table of Contents ====

[[#k80_rev1_preliminary_design_updates|K80 Rev1, Preliminary Design Updates]]

[[#introduction|Introduction]]

[[#rev_1_features|Rev 1 Features]]

[[#design|Design]]

====== K80 Rev1, Preliminary Design Updates ======

===== Introduction =====

K80 has a number of minor engineering changes, but a major improvement in its memory bank logic will let it work with the standard version of ROMWBW-KIO software and more closely aligned with RC2014 family of products.

[[https://www.retrobrewcomputers.org/lib/exe/fetch.php?tok=b96f06&media=https://www.retrobrewcomputers.org/lib/plugins/ckgedit/fckeditor/userfiles/image/builderpages/plasmo/k80/k80rev1/dsc_70861117.jpg|{{https://retrobrewcomputers.org/lib/exe/fetch.php?w=600&h=482&tok=50f3d8&media=https%3A%2F%2Fwww.retrobrewcomputers.org%2Flib%2Fplugins%2Fckgedit%2Ffckeditor%2Fuserfiles%2Fimage%2Fbuilderpages%2Fplasmo%2Fk80%2Fk80rev1%2Fdsc_70861117.jpg?600x482|www.retrobrewcomputers.org_lib_plugins_ckgedit_fckeditor_userfiles_image_builderpages_plasmo_k80_k80rev1_dsc_70861117.jpg}}]]

===== Rev 1 Features =====

Z80 overclocked to 22MHz

512K flash, SST39SF040

512K RAM

KIO (Z84C90) configured to I/O address 0x80-0x8F

Compact flash interface

DS1302 RTC

Two RC2014 expansion slots

Economical 100mmX100mm 2-layer PC board

[[https://retrobrewcomputers.org/lib/exe/fetch.php?tok=533de7&media=https%3A%2F%2Fwww.retrobrewcomputers.org%2Flib%2Fplugins%2Fckgedit%2Ffckeditor%2Fuserfiles%2Fimage%2Fbuilderpages%2Fplasmo%2Fk80%2Fk80rev1%2Fdsc_70871117.jpg|{{https://retrobrewcomputers.org/lib/exe/fetch.php?w=500&h=406&tok=55f7e5&media=https%3A%2F%2Fwww.retrobrewcomputers.org%2Flib%2Fplugins%2Fckgedit%2Ffckeditor%2Fuserfiles%2Fimage%2Fbuilderpages%2Fplasmo%2Fk80%2Fk80rev1%2Fdsc_70871117.jpg?500x406|www.retrobrewcomputers.org_lib_plugins_ckgedit_fckeditor_userfiles_image_builderpages_plasmo_k80_k80rev1_dsc_70871117.jpg}}]]

===== Design =====

Schematic

Design Changes from rev0 pc board