Service Manual
TANDY 6000/6000-HD
TANDY COMPUTER PRODUCTS ------------------------------------------------------------------------
Jumper Location
Port Range Decoded
El to E2
CO to CF Hex
El to E3
70 to 7F HEX
El to E4
60 to 7F HEX
El to E5
50 to 5F HEX
Table 7-11.
Port Decoding
Further decoding is done by U34, a 74S139 that determines
one of four 4 byte ranges.
The first range is indicated by
the signal SELDIR*, which indicates a select of ports C0-C3.
This signal enables one half of another 74S139, U42,
depending
on a read or write operation. Only two outputs of
U42 are used, those being WRDIRl* and RDDIRl*.
WRDIRl* is
used to clock data onto an octal latch, U12, and RDDIRl* is
used to enable a read from that latch by turning on U21.
Normally the host data bus transceiver is turned to pass
data to the controller board by the state of the signal
M2DEN.
A multiple and-nor gate, U15, is used to determine
one of the following conditions and switch the direction of
data flow
toward the host system.
The conditions are: a
read from
a port in the selected range, a read of one of the
onboard CTC channels, or an interrupt acknowledge cycle.
- 2 2 0 -
Port Address
Description/Use
CO
Write protect status— read only
Cl
Control-enable— write/read.
C2
Not used
C3
Not used
C4
CTC channel 0 control
C5
CTC channel 1 control
C6
CTC channel 2 control
C7
CTC channel 3 control
C8
Drive data register
C9
Read— drive error register
Write— write precompensation
CA
Sector count register
CB
Sector number register
CC
Cylinder LSB register
CD
Cylinder MSB register
CE
SDH register
CF
Read— drive status register
Write— command register
Jumper Location
Port Range Decoded
El to E2
CO to CF Hex
El to E3
70 to 7F HEX
El to E4
60 to 7F HEX
El to E5
50 to 5F HEX
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 161: ...Service Manual TANDY COMPUTER PRODUCTS TANDY 6000 6000 HD Figure 7 11 Timing Diagram 168...
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Page 206: ...Service Manual TANDY 6000 6000 HD TANDY COMPUTER PRODUCTS 2 1 6...
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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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