Kr0tki
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Posts posted by Kr0tki
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Well I don't know why they don't work, because I haven't seen them, but still, I don't see the point in investigating the issue, if the 16 KB ROMs work for you.
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Why can't you just use the 16 KB ROM image?
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Your numbers don't seem to be correct. In the Atari Engineering Information System Item Master List, the parts are listed as:
C010177 CRYSTAL: 3.579575 MHZ
C016010 CRYSTAL: 3.579545
C061090 CRYSTAL,3.579545 MHX,QUARTZ
and the frequencies are the same in Field Service Manuals for the various computer and console models. So there is apparently no difference in frequencies between the two.
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On 5/16/2016 at 1:15 AM, Ballblaɀer said:
The "29 3 PR" cart uses ROMs from NCR Microelectronics. The one stamped 2332-30 is a 32K (?) ROM chip, according to an NCR catalog from 1985. The one stamped 2364-30 is a 64K (?!) ROM chip according to the same catalog. The "25 3 R" cart uses what I think are two regular 8K ROM chips, but I'm not positive. Star Raiders is a 16K game... so... was it common for Atari to use ROMs with more memory than was needed, or is this out of the ordinary?
"Star Raiders" is a 12 KB game. This matches with the chip sizes that you've found - the cartridge contains one 64 Kbit = 8 KB and one 32 Kbit = 4 KB chip, which sums up to 12 KB.
What bugs me, these two cartridges contain chips with differing internal part numbers. That most certainly means that the contents of the ROMs also differ.
I've cross-referenced the numbers with Atari's "Engineering Information System - Item Master List". Here are all the pages with part numbers for 5200 ROMs:
The ROMs from the "25 3 R" cartridge are described there as "CX5205 CARTRIDGE" while the "29 3 PR" ones are described as "CX5205P CARTRIDGE". Considering that, in the context of this list, the "P" in description of 2600 cartridges means PAL variants, this would mean that the "29 3 PR" cartridge indeed contains an updated version of "Star Raiders", modified to support the planned PAL 5200 console. There exists a PAL prototype of Star Raiders, so maybe they simply replaced the original release with the PAL-compatible version at some point in time?
Look, there are several other ROMs listed as "CX52xxP CARTRIDGE". There may be more game revisions in the wild that we don't yet know of. I guess we need a coordinated effort to search for and dump the 5200 cartridges like we started in the 8-bit section a few years ago.
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My main issue with the 8-bit version was that player movement was restricted to a grid. Maybe it would not be such an issue if the game was fast enough, but it was so anemic, especially compared to the C64 version, that it made the control feel laggy to the level of actually hampering playability. Dark Chambers was much better.
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The worst for me was not the lack of any particular tile, but that Gauntlet was so disappointing. The title screen promised a lot, but the gameplay was not very good. At least we had Dandy and Dark Chambers.
Championship Sprint would be great, certainly could be done better than Grand Prix Simulator.
Also, I loved Xybots and Rampart on the Amiga and I believe both could be decently converted.
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1 hour ago, rdefabri said:
Rare I see an Atari game that exists on multiple platforms (C64, ZX Spectrum, Atari 2600) that isn't on the A8 line
Not that rare at all. "Road Runner" is an Atari Games game, and it was the norm that their games would be converted to everything but the kitchen sink, unfortunately that kitchen sink was the A8 line. In fact, the only game of theirs that was converted to the A8 was "Gauntlet".
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Doublepost
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On 1/12/2024 at 3:56 PM, baktra said:
Is there an image of the 2-port BIOS ROM somewhere? I have been looking for a while, but all I found is the BIOS ROM for the 4-port models.
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That whole Youtube channel is all fake videos - it is one of several "Thomas the Tank Engine" Alternate Reality Games, because ARGS are apparently a thing in the Thomas fandom.
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AtariAge has always been a safe space to me, but what has it now devolved to? Feline cornography?
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I've noticed that artwork was used on the Lynx "Super Asteroids/Missile Command" cartridge.
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It works for its intended purpose, that is, it does force the Self-Test when the jumper is removed.
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Just join them in the LO-HI order (see attachment) and it works, when you choose the one-chip 16KB cartridge mapping. The 1-24 prototype uses the two-chip mapping - apparently they switched to a one-chip memory layout mid-production, same as in the case of the various Choplifter prototypes.
The only difference between the 1-24 and 2-28 prototypes I noticed is that the power pellet bug has been fixed. Still no intermissions, and the sounds, the bear level, and the title screen are all identical.
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Well, if we consider that Atari were prototyping their first bank-switched cartridge around that time... Who knows what the final version would look like if not for the Tramiels.
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About 1500 bytes free. For comparison, the difference between the original Pac-Man and the prototype with intermissions is ca. 5200 bytes.
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Glenn's conversion seems to be identical to the 5200 prototype, except for the aforementioned issue with the ghosts stopping/starting every second on the 1st life, and for the fact that the power pellet bug has been fixed.
I don't think Glenn based his work on a different version of the 5200 prototype, but rather that he introduced both these changes when porting the 1-24 proto. Binary comparison of the 1-24 proto and Glenn's version shows that the two are mostly identical.
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Yes, it's been fixed.
More differences:
* The purpose of the ghosts being visible on the title screen in the 8-bit version is that it is possible to select the number of ghosts in-game with the Select key.
* In the 8-bit version the easy "bear" mode (selectable with Option) is unavailable.
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Methinks it would be a better idea to just port the 8-bit prototype to the 5200 instead. The 8-bit proto is full 6 months later in development, so besides the fixed power pellet bug it has some other improvements. The ones I've noticed:
* Ghost sprites added on the title screen,
* Improved sounds (the 5200 proto mostly reuses sound effects from Ms. Pac-Man).
Speaking of which @Tempest, the description of the 8-bit prototype on Atariprotos.com claims that the power pellet bug is present in that version. Could you fix that? Also, the game seems a good candidate to describe in the "5200 vs 400/800 Differences" section.
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11 hours ago, newTIboyRob said:
Wasn't there a way to "duck" from the things flying overhead in the original Pitfall, or am I thinking of another game?
You are probably thinking of "Keystone Kapers".
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9 hours ago, Tempest said:
So if you write protect the disk then it won't run at all and if you run it on an Atari 400/800 is will format the disk, but not if run on an XL/XE?
Yes, precisely.
9 hours ago, Tempest said:Is it just a fluke that the XL/XE doesn't trigger this?
I didn't have time to check this.
10 hours ago, Tempest said:I guess the imperfect copy must have have triggered the copy protection. That would explain why my copy suddenly stopped working. Can this be fixed or patched out?
Why do you think the copy is imperfect? It works.
10 hours ago, Tempest said:Do you see any differences between the three versions other than the splash screen in the second one?
I haven't looked into the differences yet.
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There are two issues with the 3/9/85 disk. The first is, it fails to run if the disk is write-protected. If not, then it changes some bytes on the disk in sector 198 and proceeds to load correctly.
The second issue is, the above is true on an XL/XE. When run on a 400/800, it will format the disk upon booting. MWAHAHAHAHAAA Make sure you make a backup.
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Thanks atari65xenajm!
I see that the "Bank al-Malūmāt" cartridge label has a Roman "I" in the name. Could this possibly suggest that there exists a second, different Bank al-Malūmāt cartridge, similarly to "Labība was Sanāfir" and "Jābir bin Hayyān"?
Unrelated: While searching the web randomly, I found out that a) aDawliah had their own Najm-branded variant of the XC12 tape recorder, named NC-60; and that the Najm brand was not exclusive for the Atari business - aDawliah used the brand to sell a line of portable speaking dictionaries, see here and here.
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Jr Pac-Man fix?
in Atari 5200
Posted
Sorry, it's just not my cup of tea.