The System Manual of SOL-20 - History of Computers

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PROCESSOR TECHNOLOGY CORPORATION Sol OPERATING PROCEDURES SECTION VII Sol CONNECTIONS CABLING RECORDER CONNECTIONS (J6) Audio OUT (J7) Audio IN (J8) Motor 1 (J9) Motor 2 (A) (A) (B) (B) Shielded Cable Speaker Wire R1 R2 (A) (A) (A) (A) (B) (B) AUXILIARY Input (Unit 1) AUXILIARY Input (Unit 2) MONITOR (Unit 1) MONITOR (Unit 2) REMOTE (Unit 1) REMOTE (Unit 2) (A) Miniature Phone Plug (B) Subminiature Phone Plug R1 = R2 = 1000 ohms, 1/4 watt Figure 7-5. Connecting Sol to two cassette recorders 3. Set recorder(s) tone control(s) at the top of the range (maximum treble). 4. Set PLAY control(s) for playback mode. 5. Give Sol the GET or "GET, then Execute" command as appropriate. (Refer to your SOLOS Users' Manual for instructions on how to use tape commands.) 7.9.2 Serial Data Interface (SDI) The Sol Serial Data Interface (J1) is capable of driving an RS- 232 device, such as a modem, or a current loop device, such as the ASR33 TTY. S3 (Baud Rate) and S4 (Parity, Word Length, Stop Bits and Full/Half Duplex) are used to select the various serial interface options as described in Paragraphs 7.5.7 through 7.5.11 in this section. VII-28
PROCESSOR TECHNOLOGY CORPORATION Sol OPERATING PROCEDURES SECTION VII Set S3 switches to select the Baud rate required by the modem or current loop device. (Standard 8-level TTY's operate at 110 Baud, S3-2 ON and all other S3 switches OFF.) For standard 8-level TTY's and most modems, set all S4 switches OFF. (This selects eight data bits, two stop bits, no parity bit and full duplex operation for the SDI. Figures 7-6 and 7-7 show examples of current loop and modem interconnections to the Sol SDI connector (Jl). The ASR33 TTY is used to illustrate a current loop interconnect, and the Bell 103 modem is used to illustrate a modem interconnect. When operating in the terminal mode and full duplex. Sol keyboard data is transmitted out on Pin 2 of Jl and date received on Pin 3 of Jl is displayed on the video monitor. In the command mode, SOLOS set in and out commands can be used to channel output data and input data through the SDI. (Refer to your SOLOS Users' Manual for instructions on how to use the set commands.) In either mode, the LOCAL key directly controls the SDI. With the LOCAL indicator light on, received data is ignored and keyboard data is not transmitted. It is, however, looped back for display on the video monitor. With the LOCAL light off, received data is displayed and keyboard data is transmitted but not displayed unless it is echoed back. 7.9.3 Parallel Data Interface (PDI) The Sol Parallel Data Interface (J2) is used to drive parallel devices such as paper tape readers/punches and line printers. It provides eight output data lines, eight input data lines, four handshaking signals and three control signals. The latter allow up to four devices to share the PDI connector. (See Appendix VII for J2 pinouts.) The port address for parallel input and output data is FD (hexadecimal), and the control port address for the PDI is FA (hexadecimal). PXDR is available at bit 2 of port FA. When this bit is set to 0, the external device is ready to receive a byte of data. PDR is available at bit I of port FA, with 0 indicating the external device is ready to send a byte of data. Parallel Unit Select (PUS) is controlled by bit 4 of port FA. The input and output enable lines are available for tri-stating an external two-way data bus. Use of the three control signals is optional and is unnecessary when only one device is connected to the PDI connector. (Paragraph 7.9.3 continued on Page 31.) VII-29
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Sol SYSTEMS MANUAL, 6200 Hollis Str
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CONTENTS OUTILNE Detailed contents
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