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 K80W rev1.

www.retrobrewcomputers.org_lib_plugins_ckgedit_fckeditor_userfiles_image_builderpages_plasmo_k80_k80_rev2_annotated.jpg

Features

  • Z80 overclocked to 22MHz,
  • 512KB Flash divided into 16 32KB banks,
  • 512KB 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,
  • 100mm X 100mm, 2-layer PC board,

Design Files

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 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 ROM binary file for SST39SF040 that recognizes SD card connected to PIO:

builderpages/plasmo/k80/k80w_r21.txt · Last modified: 2024/12/30 23:26 by plasmo
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