Tandy 1000 Technical Reference Manual

Tandy 1000
Technical Reference Manual
8255A18255A·5
Figure 22. Digital to Analog, Analog to Digital
FLOPf'YDISK
CONTROLLER
AND DRIVE
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PC
o
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---- SYNC RfA[)Y
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PB, -----_ENABLfCRC
P86~- TEST
P8/..--- ----- BUSYLT
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Figure 23. Basic CRT Controller Interface
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REQUEST I
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6
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'A,
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6
'OUTPUT' PA,
I
'C,
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-- --_ .. - R
1
-- R
J
_ R,
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CRT CONIROLLfR
• CHAAACHRGfN
_REFRESHAUFFfR
• CURSOR CONTROL
- - HOR STFPSTROBf
__ VERT SHPSTROBE
SLE .... '5TEP
'--------------------
Figure 24. Basic Floppy Disc Interface Figure 25. Machine Tool Controller Interface
6-18' AFN-007''''C

Tandy 1000 Specifications

General

Processor	Intel 8088
Processor Speed	4.77 MHz
RAM	128 KB (expandable to 640 KB)
Operating System	MS-DOS 2.11
Manufacturer	Tandy Corporation
Release Year	1984
Storage	Single or double 5.25" floppy disk drive (360 KB), optional hard drive
Sound	Tandy 3-voice sound
Ports	Parallel, Serial
Graphics	CGA (Color Graphics Adapter)
Graphics Modes	320x200, 640x200