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TM 11-6625-3145-14
Theory of Operation-318/338 Service
Figure 4-8. 318 Timing diagram of the slow-clock detector and timer circuit.
318/338 A05 ROM/THRESHOLD BOARD <5>
A simplified diagram of the ROM and the Threshold circuits is shown in Figure 4-9.
ROM CIRCUITRY
The 318/338 has 104 K-bytes of ROM and 8 K-bytes of RAM.
The address decoder consists of A05U1001, A05U005, and A05U150D. It provides the chip-select signal that determines
which specific device communicates with the MPU. This selection is determined by the output of the dual 2-line-to-4-line
decoders, A05U1001 and A05U005. Gate A05U150D supplies the MERQ (MEmory ReQuest) signal for each fetch cycle.
The memory map is shown in Table 4-6. The I/O map is shown in Table 4-7. A05U90 and A05U92 are used to decode
the I/O instructions on the A05 ROM/Threshold board.
Table 4-6.
MEMORY MAP
Page
Address Range
Capacity and Use
ALL
0000-3FFF
ROM 1, 16K X 8; Utility 1
ALL
4000-7FFF
ROM 2, 16K X 8; Utility 2
0
8000-BFFF
ROM 3, 16K X 8; Setup
1
8000-BFFF
ROM 4, 16K X 8; Timing
2
8000-BFFF
ROM 5, 16K X 8; Data
3
8000-BFFF
ROM 6, 16K X 8; Serial/RS-232
4-24
Summary of Contents for 318
Page 119: ...318 VERIFICATION AND ADJUSTMENT PROCEDURES ...
Page 182: ...338 VERIFICATION AND ADJUSTMENT PROCEDURES ...
Page 253: ...318 ___________________ TROUBLESHOOTING TREES ...
Page 344: ...338 TROUBLESHOOTING TREES ...
Page 517: ...TM 11 6625 3145 14 318 338 4434 923 318 Block Diagram ...
Page 518: ...TM 11 6625 3145 14 318 338 4434 924 338 Block Diagram ...
Page 519: ...TM 11 6625 3145 14 318 338 4434 925 318 Acquisition Module Wiring Diagram ...
Page 520: ...TM 11 6625 3145 14 318 338 4434 926 318 338 Mainframe Wiring Diagram ...
Page 521: ...TM 11 6625 3145 14 318 338 4434 926 338 Acquisition Module Wiring Diagram ...
Page 522: ...TM 11 6625 3145 14 318 338 4434 928 Figure 9 1 318 A01 Input A Board Component Locations ...
Page 526: ...TM 11 6625 3145 14 ...
Page 528: ...TM 11 6625 3145 14 Figure 9 3 318 338 A03 ACQ Control Board Component Locations ...
Page 532: ...TM 11 6625 3145 14 ...
Page 536: ...TM 11 6625 3145 14 ...
Page 538: ...TM 11 6625 3145 14 ...
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Page 542: ...TM 11 6625 3145 14 Figure 9 8 318 338 A10 CRT Board Component Locations ...
Page 544: ...TM 11 6625 3145 14 Figure 9 9 318 338 A11 Inverter Board component Locations ...
Page 546: ...TM 11 6625 3145 14 Figure 9 10 318 338 A12 Regulator Board Component Locations ...
Page 551: ...TM 11 6625 3145 14 Figure 9 12 338 A01 Input A Board Component Locations ...
Page 553: ...TM 11 6625 3145 14 318 338 SERVICE ...
Page 554: ......
Page 555: ...PIN 058584 ...