#255

... rticular hurry for it to arrive... ;^) A5000-16/1Mb (16.67Mhz 68020) ...... #170 B5000-25/1Mb (25Mhz 68030+68882) ... #425 (yes, a genuine '030-with-MMU!) B5000-40/4Mb (40Mhz 68EC030) ....... #850 50Mhz 68882 for B5000-40 ........... #255 Extra 4Mb of RAM for B5000-40 ...... #212 (far cheaper elsewhere) CONTACT Solid State Leisure Ltd, 80 Finedon Road, Irthlingborough, Northants NN9 5TZ, England. Tel +44 933 650677 If you have any questions, feel free to e-mail me on the net. SSL are ...

... n 00 and FF (0 to 255 in dec). A word is 4 digits long and is between 00 00 and FF FF (0 to 65535 in dec). Finally a long is made up of 8 digits and is between 00 00 00 00 and FF FF FF FF (0 to 4294967295 dec). With other words: byte: $00 - $FF #0 - #255 word: $00 00 - $FF FF #0 - #65535 long: $00 00 00 00 - $FF FF FF FF #0 - #4294967295 As you can see a byte takes up one fourth of the memory a long does. This principle will be discussed further in the chapter dealing with HexEditors. I think it mig ...

... ect files as string arrays. Among other things, this allows string manipulations on binary machine code. Consider the following hypothetical program line: 100 MAT SEARCH A$()=HEX(A900A2FF) TO ADR$(),N You may recognize the hex string as "LDA #0, LDX #255". That program line will search array A$() for all occurences of the four-byte substring, and return the addresses [with respect to the first byte of A$()] of every match to array ADR$(), plus the total number of matches to N. If the number of match ...

... BIT = 0. This is very bad if these were not meant to be = 0. So we use some LOGIC instructions to get around this and keep the other bits exactly the same but also changing bit 4 to equal 1 (Just assume all BITS in 532565 are 0): 10 LDA 53265 20 AND #255 30 ORA #16 40 STA 53265 Ok, firstly we get the value from 53265, we then AND this value with 255. The result of the AND is OR'ed with 16 to give the final result which is stored back at location 53265. 10 - Value 0000 0000 (We said assume that a ...

... han lesson 5 to get the sprite moving up & down. And this time instead of just boring up & down movement we will produce a bounce effect. Lets get straight into the coding: 10 LDA #147 20 JSR $FFD2 30 LDA #00 40 STA 53280 50 STA 53281 60 LDA #255 70 STA 53269 80 STA 53276 90 LDA #02 100 STA 53285 110 LDA #03 120 STA 53286 130 LDX #00 140 COLOUR LDA #04 150 STA 53287,X 160 INX 170 CPX #08 180 BNE COLOUR 190 LDA #64 200 LDX #00 210 BACK STA 2040,X 220 INX 230 CPX #08 240 BEQ DONE 250 LDA 2040, ...

... roughly what we need to do: Clear Screen Set up Sprite pointer Set up Sprite Colours & Mode Set up X & Y position of Sprite Move it Down Move it Up So lets write the code: 10 LDA #147 20 JSR $FFD2 30 LDA #00 40 STA 53280 50 STA 53281 60 LDA #255 70 STA 53269 80 STA 53276 90 LDA #02 100 STA 53285 110 LDA #03 120 STA 53286 130 LDX #00 140 COLOUR LDA #04 150 STA 53287,X 160 INX 170 CPX #08 180 BNE COLOUR 190 LDX #64 200 STX 2040 210 INX 220 STX 2041 230 INX 240 STX 2042 250 INX 260 STX 2043 27 ...

... of the services offered by the Unix RT sysops, and where to find more information: .* Many Frequently Asked Questions archived from the Internet. Search on "FAQ" in the software library. .* Up to date Usenet UUCP Maps in library #15. Start with file #2551 README.MAP for interpretations. .* FTP Request Service. If you can't find it elsewhere on a GEnie RoundTable, ask us to find it for you. See bulletin board category #1, topic #8. Library #41 for listings, #42 for files. Real Time Conference: Sunday ...