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--- builderpages:plasmo:k80:k80w_r21 [2025/12/16 03:13] – Revision from 2025-12-16
+++ builderpages:plasmo:k80:k80w_r21 [2026/06/15 13:08] (current) – external edit 127.0.0.1
@@ Line 1: / Line 1: @@
+/* Imported from Wayback Machine
+   Original URL : https://www.retrobrewcomputers.org/doku.php?id=builderpages:plasmo:k80:k80w_r21
+   Snapshot date: 2025-09-28
+   Generator    : wayback-archiver
+*/
+====== K80W Rev2.1, A RomWBW-capable Z80 SBC ======
+===== Introduction =====
+K80W is similar to K80. It is a 22MHz Z80 SBC with KIO (Z84C90) as the I/O device. It is designed to run RomWBW. The current version is rev 2.1 replacing the older [[builderpages:plasmo:k80:k80w_r1|K80W rev1]].
+[[https://www.retrobrewcomputers.org/lib/exe/fetch.php?tok=1bd03c&media=https://www.retrobrewcomputers.org/lib/plugins/ckgedit/fckeditor/userfiles/image/builderpages/plasmo/k80/k80_rev2_annotated.jpg|{{https://www.retrobrewcomputers.org/lib/plugins/ckgedit/fckeditor/userfiles/image/builderpages/plasmo/k80/k80_rev2_annotated.jpg?600x400|www.retrobrewcomputers.org_lib_plugins_ckgedit_fckeditor_userfiles_image_builderpages_plasmo_k80_k80_rev2_annotated.jpg}}]]
+===== Features =====
+Z80 overclocked to 22MHz,
+KB Flash divided into 16 32KB banks,
+KB RAM divided into 16 32KB banks,
+KIO, Z84C90, is the integrated I/O interface,
+DS1302 Real Time Clock,
+Compact Flash interface,
+SD Card interface,
+Designed for RomWBW,
+Two 40-pin RC2014-compatible expansion slots,
+mm X 100mm, 2-layer PC board,
+===== Design Files =====
+[[https://www.retrobrewcomputers.org/lib/exe/fetch.php?media=builderpages:plasmo:k80:k80w_rev2_scm.pdf|Schematic]]
+[[https://www.retrobrewcomputers.org/lib/exe/fetch.php?media=builderpages:plasmo:k80:k80w_rev2_1_gerber.zip|Gerber photoplots]]
+[[https://www.retrobrewcomputers.org/lib/exe/fetch.php?media=builderpages:plasmo:k80:k80rev1:k80w_r1pcb_cpld_epm7032s.zip|CPLD design files]]
+Bill of Materials
+==== RomWBW Configuration ====
+The following modifications to RCZ80_K80W.ASM file is needed:
+SDENABLE .SET TRUE ; SD: ENABLE SD CARD DISK DRIVER (SD.ASM)\\
+SDMODE .SET SDMODE_PIO ; SD: DRIVER MODE: SDMODE_[JUHA|N8|CSIO|PPI|UART|DSD|MK4|SC|MT|PIO|Z80R|USR]
+\\
+This is the resulting [[https://www.retrobrewcomputers.org/lib/exe/fetch.php?media=builderpages:plasmo:k80:rcz80_rev2pcb_k80w_configuration.zip|RCZ80_K80W.ASM]]
+The I/O addresses for SDMODE_PIO is hardwired to $69. It is necessary to modify SD.ASM in HBIOS as follow:
+SD_IOBASE .EQU $82 ; IO BASE ADDRESS FOR SD INTERFACE
+SD_DDR .EQU $83 ; DATA DIRECTION REGISTER
+This is the resulting [[https://www.retrobrewcomputers.org/lib/exe/fetch.php?media=builderpages:plasmo:k80:rcz80_k80w_rev2pcb_rom.zip|ROM binary file]] for SST39SF040 that recognizes SD card connected to PIO: