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SYSTEM DESCRIPTION
The MC-10 Micro Color Computer is a fully
expandable microprocessor system. It is com-
posed of a 6803 central processing unit, 4K of
static RAM, 8K of Basic ROM, and a 6847 video
display generator. The microcomputer is also
interfaced to a 48-key keyboard and provides
the logic to execute a 1500 Baud cassette inter-
face and a RS-232 serial interface. The system
operates on a common color burst frequency
of 3.579545 MHz. This main clock is divided by
4 in the CPU to yield an operating speed of 0.89
MHz.
In operation, the 4K of static RAM is shared
between the CPU and the video display gene-
rator. This time multiplexing is based on the
processor clock E. The CPU will be granted
access to the RAM (upon request) only during
the high state of E. This allows efficient usage
of the RAM with no waiting by the CPU and no
visible conflict on the display.
The 6847 VDG provides a display on a TV
screen of 32 characters by 16 rows. It also
allows a 64 x 32 semigraphics mode with eight
colors. This display utilizes a minimum amount
of system RAM (512 bytes).
The final elements of the microcomputer sys-
tem are the I/O devices. The MC-10 is interfaced
to a 48-key keyboard which generates the
codes for upper and lower case characters,
graphics symbols, and single stroke keyboard
entry. The computer also provides a 1500 baud
cassette interface for fast and reliable data and
program storage and a limited signal RS-232C
interface. The RS-232C interface allows either a
printer or a modem to be used with the MC-10.
Содержание TRS-80
Страница 3: ...3 SECTION I SYSTEM DESCRIPTION...
Страница 5: ...5 SYSTEM BLOCK DIAGRAM...
Страница 7: ...7 SECTION II SPECIFICATIONS...
Страница 9: ...9 SECTION III DISASSEMBLY REASSEMBLY...
Страница 11: ...11 SECTION IV THEORY OF OPERATION...
Страница 21: ...21 SECTION V TROUBLESHOOTING...
Страница 25: ...25 SECTION VI PARTS LIST...
Страница 30: ...30 SECTION VII PRINTED CIRCUIT BOARDS...
Страница 31: ...31 MAIN P C B TOP VIEW...
Страница 32: ...32 BOTTOM VIEW...
Страница 33: ...33 SECTION VIII IC INTERNAL CONNECTIONS...
Страница 34: ...34 IC INTERNAL CONNECTIONS U1 MC6803G Motorola or HD6803P Hitachi...
Страница 35: ...35 U11 MC6847P Motorola...
Страница 36: ...36 U2 SN74LS373N Motorola or MB74LS373M Fujitsu U7 SN74LS245N Motorola or MB74LS245M Fujitsu...
Страница 37: ...37 U3 MB8364M Fujitsu U9 10 PD4016C 1 NEC or PD4016D 1 NEC or MB8128 15P Fujitsu or MSM2128 20RS Oki...
Страница 41: ...41 U15 LM339N Motorola or PC339C NEC U18 SN74LS74AN Motorola or MB74LS74AM Fujitsu or HD74LS74AP Hitachi...
Страница 42: ...42 U16 MC1741CP1 Motorola or HA17741PS Hitachi U17 MC7805CT Motorola or NJM7805A JRC or PC7805H NEC...
Страница 43: ...43 SECTION IX SCHEMATlC DlAGRAM SECTION X EXPLODED VlEW...