31 July 2013, 14:56 | #241 | |
Registered User
Join Date: Jan 2012
Location: USA
Posts: 373
|
Quote:
And while the blitter can be used to do addition bit-by-bit, I don't think it's nearly as fast and direct as simply loading two blitter registers and letting Agnus add them in a couple of cycles. In fact, three additions can be done very quickly by using A,B, and C in one blit. |
|
31 July 2013, 15:29 | #242 |
Glastonbridge Software
Join Date: Jan 2012
Location: Edinburgh/Scotland
Posts: 2,243
|
Well! You would think so! But answer me this, why does it fill from right to left, such that you have to use descending mode?
The way the fill mode works, you don't need to worry about bit-by-bit addition, fill mode already carries a bit along from right to left. You could do addition on huge blocks of data (and of arbitrary precision, 128 bit integers, 256 bit integers... 16000 bit integers, whatever). I haven't yet worked out exactly the sequence of blits and minterms you'd need to use but I'm sure it's possible. |
31 July 2013, 15:46 | #243 | ||
-
Join Date: Jul 2003
Location: Helsinki / Finland
Age: 43
Posts: 9,918
|
Quote:
Quote:
|
||
31 July 2013, 15:58 | #244 | |
Registered User
Join Date: Jun 2013
Location: Australia
Posts: 685
|
Quote:
or it was indicative of a different model.. such as 500+. When a guru meditation happens does the power LED flash half as bright or something like that? |
|
31 July 2013, 16:10 | #245 |
Glastonbridge Software
Join Date: Jan 2012
Location: Edinburgh/Scotland
Posts: 2,243
|
Oh does anybody know what happens exactly if you do a blitter fill with BOTH Inclusive and Exclusive mode bits set?
|
31 July 2013, 17:46 | #246 | |
Registered User
Join Date: Jun 2013
Location: Australia
Posts: 685
|
Quote:
I will guess the result is not both operations on the value data. Not to detract, but one more question because I found the name of the demo recently... Was it found out how Spaceballs is possible? |
|
31 July 2013, 17:54 | #247 | |
HOL/FTP busy bee
Join Date: Sep 2006
Location: Germany
Age: 46
Posts: 32,007
|
Quote:
|
|
31 July 2013, 19:03 | #248 |
WinUAE developer
Join Date: Aug 2001
Location: Hämeenlinna/Finland
Age: 49
Posts: 26,574
|
|
31 July 2013, 19:23 | #249 | ||
-
Join Date: Jul 2003
Location: Helsinki / Finland
Age: 43
Posts: 9,918
|
Quote:
Quote:
|
||
01 August 2013, 02:50 | #250 | ||
Registered User
Join Date: Jun 2013
Location: Australia
Posts: 685
|
Quote:
it as I do, then I don't want an impossible configuration. It sounds like an Orange/Green combination where the power LED dims, on an a500+ is a legitimate combination, While Red/Green with power LED off for an a500+ is an impossible combination. So I can go with the former. Yay! Quote:
Just when you think they are reusing something.. what appears to be new data just keeps coming. I'll have a read |
||
01 August 2013, 13:15 | #251 |
Glastonbridge Software
Join Date: Jan 2012
Location: Edinburgh/Scotland
Posts: 2,243
|
Well I've been thinking all night about how to get the blitter to do block addition, and I'm sorry to say I don't think it's possible to get it to do ripple carry using fill mode. But looking at the schematic it was so close, only a couple more gates would have made it possible. The signal is even called "carry" which is maybe a clue.
BUT it is certainly possible to implement a Carry Save Adder fairly easily. http://en.wikipedia.org/wiki/Carry-save_adder So it should also be possible to get it to do multiply-accumulate. |
03 August 2013, 13:06 | #252 |
Registered User
Join Date: Jun 2013
Location: Australia
Posts: 685
|
Here's one:
Jay Miner was supposed to have gone off to design the Atari Lynx. I did a little research on it, and found it uses an embedded 68k, and some other chips in a single package. The homebrew community also have a flash cart for it to run their own software (including a GPS). Does the Lynx have any special similarity to Amiga's? Why the lack of Jay Miner's name on anything Lynx? His name is mentioned relating to the Lynx when you research Amiga, but not when you research the Lynx. Maybe is is around the time we lost him? |
03 August 2013, 13:43 | #253 | |
Workbitch 1.3
Join Date: Oct 2001
Location: Melbourne, Australia
Age: 47
Posts: 2,084
|
https://atariage.com/Lynx/history.html
Quote:
|
|
03 August 2013, 14:40 | #254 |
HOL/FTP busy bee
Join Date: Sep 2006
Location: Germany
Age: 46
Posts: 32,007
|
I think it might be this thread: http://eab.abime.net/coders-general/...tml#post688425
|
05 August 2013, 13:13 | #255 |
Glastonbridge Software
Join Date: Jan 2012
Location: Edinburgh/Scotland
Posts: 2,243
|
Actually I was thinking about this, it would be trivial to implement Rule 110 (a Turing complete cellular automaton) using just the Blitter. Or at least, a finite number of steps of it. Then use the copper to repeat the process. Not sure how useful it is, but it's good enough as a proof.
|
06 August 2013, 13:29 | #256 |
Registered User
Join Date: Jun 2013
Location: Australia
Posts: 685
|
So I heard the Amiga has it's own port of UAE.
Where does it get Kickstart from? Does it use it's own disk drive, or are drives emulated, and still use ADFs? Can you launch the emulator again, from within the emulation? Surely someone tried. It would be interesting to run a benchmark program for each instance. I imagine it would take a high end Amiga to emulate an Amiga 500. |
06 August 2013, 15:05 | #257 | |
Registered User
Join Date: Dec 2011
Location: Northamptonshire, UK
Age: 42
Posts: 1,236
|
Quote:
drives are emulated and disk images are in ADF form unless you're running from a real amiga which can do both ADF and the real thing emulating Amiga ON Amiga is only needed when you're running AmigaOS 4.x MorphOS AROS etc from a non native amiga system like the SAM systems, G4's or X86 systems. you don't need to emulate the amiga when using the real thing. Although for some stupid reason OS 4.1 for Real PowerPC Amigas does indeed emulate |
|
06 August 2013, 15:08 | #258 |
Registered User
Join Date: Dec 2011
Location: Northamptonshire, UK
Age: 42
Posts: 1,236
|
What were these parts of Xcopy for?:
The left one i know goes to 81, but why was the default 79? what were the ones on the right under Sync used for? in the manual is says that Sync is for advanced users but doesn't say what it does or why we would use it? |
06 August 2013, 15:18 | #259 |
Zone Friend
Join Date: Jun 2006
Location: Gargore
Age: 44
Posts: 17,789
|
If I remember correctly all my copies were copied to 79, not any further. Disk was not readable when something was wrong with 40th track. I don't know why, I was only gamer and still I am.
|
06 August 2013, 15:20 | #260 | ||
Unregistered User
Join Date: Sep 2012
Location: Copenhagen / DK
Age: 44
Posts: 4,190
|
Quote:
Quote:
The sync word tells the Amiga where a track starts. When it reads a track off the floppy it has no idea where it starts and where it ends as it is just a circle. It will search for this sync work in the raw MFM stream which will then indicate the start of the track. Amiga DOS disks always use 4489 sync, but other syncs are sometimes used, mainly for copy protection usage. If a copy program tries to read a protected disk using the wrong sync it will probably not be able to read the track. Track 40 contains the root block which contains information about the disk name, the files in the root etc. so this can be considered as the entry point to reading the disk. If it can't be read, the entire disk is unreadable by conventional means (like losing the partition table on a HDD). |
||
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests) | |
Thread Tools | |
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Gamebase Amiga - 2 Questions | Fiery Phoenix | New to Emulation or Amiga scene | 8 | 13 August 2012 12:31 |
Amiga CD32 questions | pubzombie | New to Emulation or Amiga scene | 26 | 24 January 2010 16:27 |
A few general Amiga questions. | Hougham | support.Hardware | 6 | 30 April 2008 22:13 |
Amiga A4000 Questions | mfletcher | support.Hardware | 8 | 29 April 2008 10:51 |
Amiga 600 Questions | JDunlap | support.Hardware | 14 | 20 January 2008 19:13 |
|
|