Micricomputer Systems MSI-P563, Руководство пользователя

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Page MSI-P563 User Manual
Table 2. Device addresses for the MSI-P563.
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Device
JP2 Jumpers Device Address
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82C55A (U10)
None 304H - 307H
16550 (U6) None COM1
S1 COM1 **
COMX COM2
COMX, S1 COM2 **
COMY COM3
COMY, S1 COM3 **
COMX, COMY COM4
COMX, COMY, S1 COM4 **
82C54 (U11) None 300H - 303H
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** Device enabled on every 1-K Byte boundary. Enables accessing
UART at standard COMx addresses in the first 1-K Byte when a base
address is greater than 0.
B. 82C55A Programmable Peripheral Interface
The 82C55A (U9) provides 24 TTL I/O lines via 50-pin connector
J1. The pin assignments are compatible with Opto-22 type I/O,
as given in Table 3. Ports A and B of the 82C55A can be
programmed as either input or output lines groups of eight bits
and port C can be selected as input or output lines in two groups
of 4 bits. In addition, bits 0 and 3 of port C are jumper selectable,
denoted as INTRA (JP5-2) and INTRB (JP5-4), to interrupt input
buffers (JP8-6 and JP8-8) for implementing strobed I/O on ports
A and B of the 82C55A (refer to the schematic in Appendix). Data
sheets describing the 82C55A are available on the internet at
www.okisemi.com/public/nf/Intro-6110.html
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