| --- Log opened Fri Aug 09 00:00:38 2019 |
| 00:06 | | Degi [Degi@Nightstar-7rc2rr.dyn.telefonica.de] has quit [Connection reset by peer] |
| 00:28 | <&McMartin> | The BASIC program ends with three 00 bytes in a row, so you can just mark those as being data |
| 00:31 | | Kindamoody is now known as Kindamoody[zZz] |
| 00:38 | <~Vornicus> | way ahead of you |
| 00:53 | <~Vornicus> | a 2 bit random seed? |
| 00:53 | <~Vornicus> | (it loads from SID oscillator output and then ANDs it with 0x03) |
| 01:17 | | celmin|away is now known as celticminstrel |
| 01:37 | <~Vornicus> | okay that's ... kind of strange, let's see what we have here. $0929 through $0938 grab two noise bits, retry if it's 3, then translate via [0,1,-1][a]. Then $0939-$0944 ... grab another two random noise bits, and if we get 0 also check the previous to see if *it's* zero, in which case it starts over, but if not we continue through all the way to $0951 which... ha, does the same mapping, which means that this whole chunk is choosing a |
| 01:37 | <~Vornicus> | random non-zero 2d vector with components in [-1,0,1] |
| 01:50 | <~Vornicus> | then it does all this ...50 times, filling in the bottom 50 bytes of six pages of data. Okay this makes some sense now. |
| 02:07 | | * Vornicus is enjoying this too much and really should be going to bed. |
| 02:17 | | Vornicus [Vorn@ServerAdministrator.Nightstar.Net] has quit [Connection closed] |
| 02:32 | | catalyst [Jessikat@Nightstar-5dv16h.cable.virginm.net] has quit [Connection closed] |
| 04:56 | <&McMartin> | Oh dear, what have I done |
| 04:58 | | celticminstrel [celticminst@Nightstar-6an2qt.dsl.bell.ca] has quit [[NS] Quit: And lo! The computer falls into a deep sleep, to awake again some other day!] |
| 07:28 | | Vorntastic [uid293981@Nightstar-6br85t.irccloud.com] has joined #code |
| 07:28 | | mode/#code [+qo Vorntastic Vorntastic] by ChanServ |
| 07:47 | | Kindamoody[zZz] is now known as Kindamoody |
| 08:41 | <&McMartin> | Vorntastic: Also, just to make sure: you've got a copy of Mapping The C64 [and the C64C if it's a later printing], right? |
| 08:41 | <&McMartin> | I don't expect it to do be doing any really advanced techniques but you'll still need a solid I/O map |
| 08:41 | <~Vorntastic> | I don't! |
| 08:42 | <&McMartin> | Do you want PDF or plain text? |
| 08:42 | <~Vorntastic> | Plaintext would be preferred but, uh |
| 08:42 | <&McMartin> | These have been OCRed for literal decades~ |
| 08:42 | <&McMartin> | Archive.org PDF: https://archive.org/details/Compute_s_Mapping_the_Commodore_64 |
| 08:43 | <&McMartin> | Project 64 plaintext: http://unusedino.de/ec64/technical/project64/mapping_c64.html |
| 08:43 | <~Vorntastic> | So the HTML version of the PRG I have is missing lots of stuff, I had to open the PDF to read about the SID interface |
| 08:44 | <&McMartin> | Yeah, the PRG really needs its diagrams |
| 08:44 | <&McMartin> | And also yes: the PRG is the bible |
| 08:44 | | Kindamoody is now known as Kindamoody|afk |
| 08:45 | <&McMartin> | Mapping the C64 is The Talmud |
| 08:46 | <&McMartin> | And then, uh, Christian Bauer's "The MOS 6567/6569 video controller (VIC-II) and its application in the Commodore 64" ends up being the New Testament, which was a name-based punchline I was not attempting when I started this metaphor |
| 08:46 | <&McMartin> | http://cebix.net/VIC-Article.txt |
| 08:46 | <&McMartin> | You will not need that for Crossroads |
| 08:46 | <~Vorntastic> | (crossroads sets the SID to use high frequency noise on the channel that you can read back; it then reads back data from that, most often masking with 0x03. I couldn't tell that's what it was doing without) |
| 08:47 | <&McMartin> | Ah yes |
| 08:47 | <&McMartin> | A fairly common trick, but I don't like it because you can't seed it. |
| 08:47 | <&McMartin> | Also because if your frequency isn't high enough your random numbers might not have changed yet |
| 08:50 | <&McMartin> | In terms of "getting a handle on what's actually going on with stuff", skimming... I think it's Chapter 3 of the PRG, the one about graphics generally... will probably help |
| 08:50 | <&McMartin> | You can skip the bitmap stuff, but the bitmap mode is worth skimming just because it's bananapants |
| 08:52 | <~Vorntastic> | This init bit so far calls this thing 350ish times (retries make it complex) |
| 09:01 | | Vash [Vash@Nightstar-sjaki9.res.rr.com] has joined #code |
| 09:20 | | Degi [Degi@Nightstar-5lfois.dyn.telefonica.de] has joined #code |
| 10:55 | | Reiver [quassel@Nightstar-ksqup0.co.uk] has quit [[NS] Quit: Reblooting.] |
| 11:48 | | You're now known as TheWatcher[d00m] |
| 12:23 | | You're now known as TheWatcher |
| 12:31 | | Reiver [quassel@Nightstar-ksqup0.co.uk] has joined #code |
| 12:31 | | mode/#code [+ao Reiver Reiver] by ChanServ |
| 13:39 | | celticminstrel [celticminst@Nightstar-6an2qt.dsl.bell.ca] has joined #code |
| 13:39 | | mode/#code [+o celticminstrel] by ChanServ |
| 14:02 | | celticminstrel is now known as celmin|away |
| 15:04 | | Vornicus [Vorn@ServerAdministrator.Nightstar.Net] has joined #code |
| 15:04 | | mode/#code [+qo Vornicus Vornicus] by ChanServ |
| 16:50 | | gnolam_ [lenin@Nightstar-hfrbpd.cust.bahnhof.se] has joined #code |
| 16:54 | | gnolam [lenin@Nightstar-hfrbpd.cust.bahnhof.se] has quit [Ping timeout: 121 seconds] |
| 16:57 | | Emmy [Emmy@Nightstar-9p7hb1.direct-adsl.nl] has joined #code |
| 17:06 | | macdjord|slep [macdjord@Nightstar-rslo4b.mc.videotron.ca] has quit [Ping timeout: 121 seconds] |
| 17:06 | | Vorntastic [uid293981@Nightstar-6br85t.irccloud.com] has quit [[NS] Quit: Connection closed for inactivity] |
| 17:33 | | Degi [Degi@Nightstar-5lfois.dyn.telefonica.de] has quit [Connection closed] |
| 17:43 | | gnolam_ is now known as gnolam |
| 17:43 | | mode/#code [+o gnolam] by ChanServ |
| 17:45 | | ErikMesoy [Bruker@Nightstar-r88323.bb.online.no] has left #code [] |
| 17:56 | | ErikMesoy [Bruker@Nightstar-r88323.bb.online.no] has joined #code |
| 17:56 | | mode/#code [+o ErikMesoy] by ChanServ |
| 18:17 | | Vash [Vash@Nightstar-sjaki9.res.rr.com] has quit [[NS] Quit: Leaving] |
| 20:04 | | Vorntastic [uid293981@Nightstar-6br85t.irccloud.com] has joined #code |
| 20:04 | | mode/#code [+qo Vorntastic Vorntastic] by ChanServ |
| 23:07 | | Emmy [Emmy@Nightstar-9p7hb1.direct-adsl.nl] has quit [Ping timeout: 121 seconds] |
| 23:34 | | Vorntastic [uid293981@Nightstar-6br85t.irccloud.com] has quit [[NS] Quit: Connection closed for inactivity] |
| 23:42 | | ToxicFrog [ToxicFrog@ServerAdministrator.Nightstar.Net] has quit [Ping timeout: 121 seconds] |
| 23:56 | | Vornicus [Vorn@ServerAdministrator.Nightstar.Net] has quit [Connection closed] |
| --- Log closed Sat Aug 10 00:00:39 2019 |