西南石油大学学报(自然科学版) ›› 1990, Vol. 12 ›› Issue (4): 104-108.DOI: 10.3863/j.issn.1000-2634.1990.04.013

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A SCM DEBUGGING CARD OF APPLE Ⅱ DMA SHARING MEMORY

Chen wei Meng Dong-sheng
  

  1. Dept. of Management Engineering
  • Received:1990-01-12 Revised:1900-01-01 Online:1990-11-20 Published:1990-11-20

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Abstract:

A cheap single component microcomputer(SCM)debugging card for Apple Ⅱ microcomputer is provided by this paper. The card makes full use of the system resources of microcomputer. The communication technique of DMA is adopted to achieve sharing main memory and parallel operation between SCM and 6502 CPU.

Key words: Apple Ⅱ microcomputer, Single component microcomputer, Debugging card