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The instructions LD A,R and LD A,I affect the Z80 flags register, unlike all the other LD (load) instructions. The Sign (bit 7) and Zero (bit 6) flags are set according to the data loaded from the Refresh or Interrupt source registers. For both instructions, the Parity/Overflow flag (bit 2) is set according to the current state of the IFF2 flip ...
The X1 (エックスワン, Ekkusuwan), sometimes called the Sharp X1 [1] or CZ-800C [2], is a series of home computers released by Sharp Corporation from 1982 to 1988. [1] It is based on a Zilog Z80 CPU .
It offers Supervisor and User operating modes, and optionally separate address spaces for instructions and data in both modes (four total possible address spaces). Its internal clock signal can be configured to run at 1, 2 or 4 times the external clock's speed (e.g. a 12MHz CPU with a 3 MHz bus). Unlike the Z80 the Z280 uses a multiplexed ...
Sharp also provided the option to replace the default white backlighting element with a green element. [11] Sharp included a BIOS setup utility in ROM, allowing the user to set the time and date of the computer's internal clock and calendar; to invert the display's colors; and to switch between clock speeds, among other parameters. [12]
The W65C816S (also 65C816 or 65816) is a 16-bit microprocessor (MPU) developed and sold by the Western Design Center (WDC). Introduced in 1985, the W65C816S is an enhanced version of the WDC 65C02 8-bit MPU, itself a CMOS enhancement of the venerable MOS Technology 6502 NMOS MPU.
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Sharp Corporation (シャープ株式会社, Shāpu Kabushiki-gaisha) is a Japanese electronics company. [4] [5] It is headquartered in Sakai, Osaka, and was founded by Tokuji Hayakawa in 1912 in Honjo, Tokyo, and established as the Hayakawa Metal Works Institute in Abeno-ku, Osaka, in 1924. [6]
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