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   ocr: Macintosh Erternal Drive Cable (part number 590-0183-B) Macintosh Sony Drive (DB9). Name (20Pin Ribbon) 1 Ground 1 2 Ground 3 3 Ground 5 4 Ground 7 5 +5V 11 7 +12V 13 8 +12V 15 10 PWM 20 11 PHO 2 12 PH1 4 13 PH2 6 14 PH3 8 15 WrReg- 10 16 HiSel 12 17 Enb12- 14 18 Rd 16 19 Wr 18 Macintosh XL Null Modem Cable (part: number 590-0166-A) Macintosh XL DTE (DB25). Name (DB25) NOTES 1 Ground 1 2 TxD- AE RxD 3 3 RxD- TxD 2 4,5 RTS,CTS AE DCD 8 pins 4, 5 connected together - DSR DTR 20 ? Ground 7 8 DCD RTS, CTS 4,5 pins 4,5 connected together 20 DTR FE DSR 6