The System Manual of SOL-20 - History of Computers

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IV. SET COMMANDS (cont.) initialized to zero but may be set to any number up to FF (hex). This command is useful when using output devices requiring a delay following a carriage return. Example: SET N=3 Result: Every CRLF issued by SOLOS will be followed by three nulls. 13
V. SUBROUTINES A. Introduction to the SOLOS Machine Language Interface The Machine Language Interface with SOLOS is based on: 1. A predefined set of 'pseudo' I/O ports allowing software compatibility as well as providing an easy means of supporting any I/O device. 2. A system defined register usage when interfacing with SOLOS. 3. A system jump table of entry points. First are the pseudo ports. Built into SOLOS are four input and four output pseudo ports. I/O requests made to a pseudo port are converted internally to a request either to a specific device, a built-in routine, or a user written routine. All non-tape I/O requests made to SOLOS are made with reference to one of the following pseudo ports. PSEUDO PORTS FOR SOLOS Pseudo Port Input Output 0 Keyboard VDM driver 1 Serial port Serial port 2 Parallel Port Parallel Port 3 User written routine User written routine PSEUDO PORTS FOR CUTER Pseudo Port Input Output 0 Keyboard data from VDM driver parallel port 3,not KDR status, on port 0; bit 0. 1 Serial port 1, RDA Serial port 1, TBE status on status on port 0, bit 6. port 0, bit 7. 2 Parallel port 2 with not- Parallel port 2 with not-PXDR PDR status on port 0, bit status on port 0, bit 1. 2. 3 User written routine. User written routine. 14
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CONTENTS OUTILNE Detailed contents
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Sol TERMINAL COMPUTERTM FIGURE 7-5
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VIII THEORY OF OPERATION 8.1 INTROD
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