By Ian Chadwick
Spiral-bound: 270 pages writer: Compute! courses; Rev Sub variation (August 1985) Language: English ISBN-10: 0874550041 ISBN-13: 978-0874550047 Product Dimensions: nine x 6.4 x 0.9 inches transport Weight: 14.4 oz. commonplace buyer evaluation: 5.0 out of five stars See all stories (2 client experiences) Amazon top Rank: #2,760,122 in Books (See most sensible a hundred in Books)
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Additional info for Mapping the Atari
Example text
57 39 RECVDN Receive done flag (255; $FF equals done). 58 3A XMTDON Transmission done flag (255; $FF equals done). 59 3B CHKSNT Checksum sent flag (255; $FF equals sent). " Not zero means no checksum follows; zero equals checksum follows transmission data. 61 3D BPTR Cassette buffer pointe r: record data index into the portion of data being read or written. Ranges from zero to the current value at location 650 ($28A). When these values are equal, the buffer at 1021 ($3FD ) is empty if reading or full if writing.
The short subroutine below can be used to change the Display List to GR . 7:RETURN 1010 (Actually, 15 ($F) is the DL number for the maximum memory mode; it a lso indicates modes eight through e leven. 7Y2. 8 to mode E in the Display List. The value 79 is 64 + 15; mode eight screen with BIT 6 set for a Load Memory Scan (LMS) instruction (see the DL information in locat ions 560,561; $230, $231). It does not check for other DL bits. You can a lso POKE 87 with the GTIA values (nine to e leven) . To get a pseudo-text window in GTIA modes, POKE the mode number here and then POKE 623 with 64 for mode nine, 128 for mode ten, and 192 for mode eleven, then POKE 703 with fou r, in program mode .
Display editor GETC H routine pointer (locat ion 62867 for entry; $F593). Temporary storage; r eturns the character pointed to b y BUFCNT above. SE 110 BITMSK Bit mask used in bit mapping routines by the OS display handler at locations 64235 to 64305 ($FAEB to $FB31). Also used as a display handle r temporary storage register . SF III SHFAMT Pixe l justification : the amount to shift the right justified pixel data on output or the amount to shift the input data to right justify it . Prior to the justification process, this va lu e is always the same as that in 672 ($2AO).