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MZ3500
2-4. SD3 (RAM based BASIC)
SD3 is active when "SHARP BASIC" is ececutedvia RAM. "SHARP BASIC" is loaded in RAM from the floppy disk.
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| MAIN CPU |
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| MSI = 1< H) | |||
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| MSO = HH) | ||||
RAM | MAS | 0 | 0 | 0 | 0 | 0 | 0 |
| 0 | 0 | I | I | I | ! |
| 1 |
MA2 | 0 | 0 | 0 | 0 | 1 | 1 |
| 1 | 1 | 0 | 0 |
| 0 | 0 | 1 | |
BANK |
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MAI | 0 | 0 | 1 | 1 | 0 | 0 |
| 1 | ) | 0 | 0 |
| 1 | 1 | 1 | |
SELECT |
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| MAO | 0 | 1 | 0 | 1 | 0 | 1 | 0 | 1 |
| 0 | 1 | 0 |
| 1 | 1 |
Ffft | I I I | I I I |
| I I I | lRwnuf% | r |
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| \\ |
\ | RAMB |
| RANC |
| KAMI) | v\ |
1 | 2 , 3 , 4 | 1 , 2 | , 3 , 4 | 1 , 2 , 3 , 4 | \ \ | \v |
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gFFF |
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| \\ |
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| N\ |
-
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| \ , | RAM SB KU "° |
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| RAMA | ROM! | ROM2 | KOM3 | K(IM4 | \\ | |
| 1FFF |
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| ]L |
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| ROM 1 PI |
| 0000 |
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ROM | M02 | 0 0 0 | 0 | ) | i | ] |
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BANK | [NOI | 0 | 0 1 | " | 1 | 0 | 0 | 1 |
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SELECT | MOO | 0 1 0 | 1 0 | 1 | 0 |
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1.Bank select,
2.Bank select,
SUB CPU
1
vx
\\RAN. SP
\\RAN SC
ROM BAS
k ' SUB CPU
Operational description
The state of the system is determined by the bootstrap program before the load of the system program.