IBM System/23 Datamaster: Difference between revisions
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The Datamaster has a rich set of Intel peripherals which consist of a 8251 USART, 8253 PIT, three 8255 PPI, 8257 DMA, 8259 PIC and 8275 CRTC. All of them, including other devices are accessed using the following ports<ref name=":0" />:
{| class="wikitable"
|+ I/O Ports decoded in the motherboard
! Ports !! Device !! Function
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| 4Fh || 8255#3 || 8255#3 control port
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{| class="wikitable"
|+ I/O Ports decoded in the floppy controller card
! Ports !! Device !! Function
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| F4h-F7h || NEC 765 || Floppy drive controller
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| F8h-FBh || 8255 PPI || Unknown purpose
|}
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