Service Manual
TANDY 6000/6000-HD
TA N D Y COMPUTER PRODUCTS
Q
The OR gate is sometimes shown as above because we are using
mostly active low signals.
You can go from one gate to
another by using DeMorgan's Theorem.
U
- 178 -
Bit 6 <D6)
1, Video Display disabled
0, Video Display enabled
Bit 5 (D5)
-
RTC interrupt enable
Bit 4 (D4)
80*/40 character mode*
Bits 3 through 0 (D3-D0)
They are "don't care" bits (not used)
Now that we know how these different ports will be used, we
can set the control bits, say in Port FF, the way we want
to.
This means that we will be writing into Port FF.
Therefore, the FFWR* signal is activated.
If, for example,
we set bit 7 to 1, bit 6 to 0, bit 5 to 1, and bit 4 to 0,
FFWR* will latch this data vector into our system and the
following results will be obtained:
Pin 11 of U41 will be high, thus enabling the 2K byte Video
RAM.
BLNKVID*, Q3 (pin 14 of U18), will go high and disable
the blank Video (Video on).
The Real Time Clock (RTC), U18 pin 3, is enabled.
This
produces a low (0) at U18 pin 7.
This generated signal is
what we previously called the 80*/40 character mode.
In
this case, the 80* character mode is enabled (low).
It is
inverted at U30 pins 1, 2, and 3 and NANDed with RCLOCK* to
appear at the output of the NAND gate U28, pins 8, 9, and 10
as CLOCK (TP26).
Note that the OR gate (U3 pins 4, 5, and 6) is drawn as a
NAND gate.
Summary of Contents for 6000 HD
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Page 124: ...Service Manual TANDY 6000 6000 HD TANDY COMPUTER PRODUCTS Table 7 5 Input Output Port Map 125...
Page 127: ...Service Manual TANDY 6000 6000 HD TANDY COMPUTER PRODUCTS Table 7 6 Memory Map 128...
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Page 266: ...FIGURE 1 1 DISK DRIVE...
Page 268: ...2 2...
Page 279: ...FIGURE 3 2 CONTROL AND DATA TIMING REQUIREMENTS 3 7...
Page 283: ...FIGURE 3 3 LSI CIRCUIT BOARD ASSEMBLY 3 11...
Page 289: ...FIGURE 3 5 DISKETTE CARE AND HANDLING 3 17...
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Page 294: ...FIGURE 4 4 INTERCONNECT BLOCK DIAGRAM 4 4...
Page 295: ...FIGURE 4 6 TRACK O TIMING 4 5...
Page 304: ...FIGURE 5 2 TIMING DISK FIGURE 5 3 HUB CENTER LINE AND TRACK LOCATION 5 4...
Page 337: ...FIGURE 6 19 HEAD CARRIAGE 6 25...
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Page 373: ...FIGURE 3 5 RADIAL CONFIGURATION 3 7...
Page 374: ...FIGURE 3 6 DAISY CHAIN CONTROL LINES...
Page 382: ...FIGURE 3 11 RECOMMENDED SHIPPING PACK DESIGN CONFIGURATION 1...
Page 383: ...FIGURE 3 11 CONTINUED RECOMMENDED SHIPPING PACK DESIGN CONFIGURATION 1 3 17...
Page 384: ...FIGURE 3 12 RECOMMENDED SHIPPING PACK DESIGN CONFIGURATION 2 3 18...
Page 385: ...FIGURE 3 13 RECOMMENDED SHIPPING PACK DESIGN CONFIGURATION 3 3 19...
Page 386: ...FIGURE 3 13 CONTINUED RECOMMENDED SHIPPING PACK DESIGN CONFIGURATION 3 3 20...
Page 387: ...FIGURE 3 14 LOAD GRAPH 3 21...
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Page 390: ...FIGURE 4 1 TEST POINT LOCATIONS...
Page 394: ...o FIGURE 4 3 READ DATA WAVEFORMS 15 TPR AND 14 TPR o 4 6...
Page 397: ...FIGURE 4 4 INDEX SENSOR 4 9...
Page 400: ...FIGURE 4 6 TRACK 0 ADJUSTMENT 4 12...
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