Hardware Configuration Required For System Software - Texas Instruments 990 Operation Manual

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945255-9701
1.2.2 HARDWARE CONFIGURATION REQUIRED FOR SYSTEM SOFTWARE. The Proto-
typing System Software requires the following hardware configuration:
• Computer - the 990/4 microcomputer. The computer has access to dynamic random
access memory (RAM) and on-board read-only memory (ROM) as described in para-
graph 1. 2. 2.1. A chassis, power supply and packaging is available with the computer.
• 733 ASR Data Terminal
• Programmer Panel
• PROM Programming Module (optional)
A simplified block diagram of the hardware configuration is shown in figure 1-1.
1.2.2.1 Model 990/4 Computer. The Model 990/4 Computer consists of the 990/4 micro-
computer on a single printed circuit card, one or more memory expansion cards, and a chassis
and power supply. The 990/4 microcomputer circuit card contains the CPU, 4K words of
on-board dynamic random access memory, and up to lK of ROM or static RAM.
Detailed information on the Model 990/4 Computer may be found in the Model 990/4 Computer
System Hardware Reference Manual, Manual No. 945251-9701.
990/4
COMPUTER
(NOTE
1)
9900
BUS
MEMORY
EXPANSION
(NOTE 2)
(B)133277
PROGRAMMER
PANEL
733 ASR
DATA TERM INAL
~----------~------------------~
__ ----":CRU BUS
NOTES
1. WITH 4096 WORDS OF DYNAMIC RAM. AND 512 WORDS
OF ROM. (THE SELF-TEST FEATURE IS STANDARD.)
2. WITH 4096 WORDS OF DYNAMIC RAM. EXPANDABLE TO
20K WORDS FOR A SYSTEM TOTAL OF 24K WORDS.
MEMORY WRITE PROTECT AND MEMORY PARITY FEATURE
ARE INCLUDED.
Figure 1-1. 990 Prototyping System Hardware Block Diagram
1-2
Digital Systems Division