Service Manual
TANDY 6000/6000-HD
T A N D Y COMPUTER PRODUCTS ---------------------------------------------------------------------
If everything is in order, then the controller is directed
to read data from track 0 and place it in the RAM .
1.
If a "record" is not found (no properly formatted data
was readable from disk), the message "BOOT ERROR TK" is
displayed.
2.
If all the records are not found, the message "BOOT
ERROR LD" - lost data -
is displayed.
3.
If a CRC error occurs, the data from the floppy disk was
read incorrectly and the message "BOOT ERROR SC" is
displayed.
After the data is successfully loaded into RAM, then:
4.
The data strings "BOOT" and "DIAG" are looked for.
If
both are found, the process continues.
If these strings
are not found, the screen will display the message "BOOT
ERROR RS" - Not a Radio Shack diskette.
The data read in from the disk is a "diagnostic" routine
that tests the DMA, PIO functions and the RAM memory.
(This
is all that is required to load the operating system using a
polled, non-interrupt method).
The memory is tested from
2000H up to FFFFH.
This is to determine if the system
memory size is 32k or 64k and operational.
The following
error messages can occur:
1. "BOOT
ERROR DM" - DMA failed.
2. "BOOT
ERROR PI" - PIO failed.
3. "BOOT
ERROR LM" - lower memory
failed.
4. "BOOT
ERROR HM" - higher memory failed.
Now if at least 32k of memory was found ok (i.e. memory
errors occurred on a word boundary and above address 8000H),
the message "32K MEMORY" is displayed in the center of the
screen.
If all 64K of memory responds, the message "64K
MEMORY" is displayed.
Either of these messages indicates
the diagnostic has passed.
Next, the message "LOADING" or "INITIALIZING" is displayed
in the upper left corner of the screen indicating that a
"loader" routine is being read in to load the operating
system.
A word of caution.
If the OS is TRSDOS 4.0 or later, then
an extra 16K of memory above 64K is required but not tested
for.
As a result, if this memory
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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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