IBM PS2 Model 50 Schematics: Difference between revisions
Title blocks and sheet 11 values rechecked on the page images; sheet 11 does show an electrolytic (C8 22 uF 25 V); remove uncited publisher history, 'IBM never published' and value-of-set puffery |
Name the diodes exactly |
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The drawings carry designators and values for the parts on each circuit. Sheet 11 shows the real-time clock ZM47, a Motorola MC146818A, with its oscillator (Y1 32.768 kHz, C17 27 pF, R16 2 MΩ and 14069 inverters ZM28A-C), the standby supply through diodes CR1 | The drawings carry designators and values for the parts on each circuit. Sheet 11 shows the real-time clock ZM47, a Motorola MC146818A, with its oscillator (Y1 32.768 kHz, C17 27 pF, R16 2 MΩ and 14069 inverters ZM28A-C), the standby supply through diodes CR1, CR2, CR4 and CR6 with R10 620 Ω from +12 V, R12 1 kΩ to CKFS, R9 10 kΩ and C16 0.0056 µF on RESET. The same sheet has ZM50, a 74ALS244 that puts the diskette status lines on XD0-XD7, and an electrolytic, C8 22 µF 25 V. | ||
== What this document does not contain == | == What this document does not contain == | ||