3 shows the logic needed to capture the address of the I/O port referenced by the 8086.
Bus 35 is 16 bits wide to accomodate the 8086 16 bit data bus, but only 8 bits (D0-D7) are used by CPU controller 47. The information contained in registers 73 is received from and transmitted to the 6502 on bus 35. Two registers are used as page registers, and one register is a twenty bit down-loadable counter. The block also contains the registers used by the 6502 to address the port emulator RAM. (2) Registers 73: This block comprises registers containing information regarding: interrupt status, 8086 I/O status, and 8086 keyboard data. protocol converters for incompatible systems, open system on bus using universal interface adapter for adaptation of different data processing systems to different peripheral devices, e.g. G06F13/387- Information transfer, e.g.G06F13/382- Information transfer, e.g.G06F13/00- Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units.230000000875 corresponding Effects 0.000 claims description 2.230000002093 peripheral Effects 0.000 title claims abstract description 17.Assignors: BROEDNER, WALTER, HUSTON, CLIFFORD, HUSTON, DICK, SANDER, WENDELL Application granted granted Critical Publication of US4888680A publication Critical patent/US4888680A/en Anticipated expiration legal-status Critical Status Expired - Lifetime legal-status Critical Current Links reassignment LITTLE BLUE LIIMITED PARTNERSHIP, A LIMITED PARTNERSHIP OF CA.
Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.) Filing date Publication date Application filed by Little Blue LP filed Critical Little Blue LP Priority to US07/108,064 priority Critical patent/US4888680A/en Assigned to LITTLE BLUE LIIMITED PARTNERSHIP, A LIMITED PARTNERSHIP OF CA. Original Assignee Little Blue LP Priority date (The priority date is an assumption and is not a legal conclusion.
LITTLE BLUE LIIMITED PARTNERSHIP A OF CA LP Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.) Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Expired - Lifetime Application number US07/108,064 Inventor Wendell Sander Dick Huston Walter Broedner Clifford Huston Current Assignee (The listed assignees may be inaccurate.
#APPLE2 6502 EMULATOR PDF#
Google Patents Peripheral device interface and controllerĭownload PDF Info Publication number US4888680A US4888680A US07/108,064 US10806487A US4888680A US 4888680 A US4888680 A US 4888680A US 10806487 A US10806487 A US 10806487A US 4888680 A US4888680 A US 4888680A Authority US United States Prior art keywords microprocessor state control input pint Prior art date Legal status (The legal status is an assumption and is not a legal conclusion. Google Patents US4888680A - Peripheral device interface and controller US4888680A - Peripheral device interface and controller
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