TRS-80
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Model 1 released 1977 Z80 at 1.77MHz
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Model 3 released 1980
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CPU Z80 at 2MHz
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RAM 16kB or 48kB
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ROM 14kB
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Text 64x16 (black & white)
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Graphics 128x48 (black & white)
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1 channel sound
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Tape and 5.25" floppy discs
The TRS-80 range competed with the Commodore PET and the Apple II. The Model 1 came in two versions, the Level 1 (4k RAM and limited version of Basic) and the Level 2 (16k with extended Basic). Although mainly used for business, many machines were used as home computers.
TRS-80 Pocket Computer -PC1
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1424 bytes of program memory
26 data memories (more can be used at the expense of program memory)
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24 digit alphanumeric LCD
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Programmable in Basic
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Optional interface for ticket printer and tape
A rebadged Sharp PC1211. The data memories could be referred to as "A" to "Z", or as "A(1)" to "A(26)". This can lead to some confusion. A program like:
10 FOR I=1 TO 10
20 A(I)=1
30 NEXT I
Will loop forever, as "A(9)" is the same as "I". So, "I" gets reset to 1 whenever the it get to 9..