Stack Exchange Network

Stack Exchange network consists of 174 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange

Questions tagged [atari-800]

For questions relating to the Atari 800 8-bit computer

3
votes
1answer
351 views

Why did the Atari's have such clear displays?

Anyone that's seen an Atari 400/800 next to a VIC-20 or C64 will know what I'm talking about - the Atari display was much, much sharper. It had a similar advantage over the Apple II, and I seem to ...
7
votes
1answer
817 views

Why does this 6502 code push a function address onto the stack before calling?

I am learning how to program the Atari 800 by examining some tutorial code that came with the IDE/Assembler I am using. I am using the MADS assembler for this. putchar_ptr = $346 csrhinh = 752 ...
14
votes
2answers
4k views

What does “jmp *” mean in 6502 assembly?

Right now I am learning 6502 assembly. Currently I am using the MADS assembler to program for the Atari 800. This program is just a small tutorial program that came with the assembler zip file I ...
3
votes
1answer
248 views

Monitor Cable for Atari 130XE. Where to buy or how to build?

I have acquired an Atari 130XE (no manual). It has a power cord and it powers up! However, there is no monitor/TV cable provided. Hopefully you can see the image I tried to attach. Where can I get ...
12
votes
3answers
463 views

Why did the Atari 5200 forsake compatibility with 400/800 game cartridges?

The Atari 400/800 home computers were well-established and quite successful in the games market by the time the Atari 5200 console was released in 1982. The 5200 shared the chips and architecture of ...
1
vote
2answers
170 views

New joystick (or build one) for Atari 800

I recently got hold of an old Atari 800 and some peripherals. Thanks to the answers to this question: How to clean (or prep) Atari 800 or any old computer I have it cleaned up and am using it. One ...
8
votes
2answers
230 views

ANTIC on-chip memory

http://atariage.com/forums/topic/172580-antic-decap-and-reverse-engineering/ contains an annotated die photo of ANTIC, the Atari 800 video chip. It's interestingly different from the VIC-II; in ...
3
votes
2answers
159 views

How to clean (or prep) Atari 800 or any old computer

I recently got my hands on a couple of Atari 800's and peripherals (disk drives, printer, cartridges, floppy disks). Before I start using this equipment, can someone point me in the right direction as ...
2
votes
2answers
275 views

FCC RF limits and wire transmission speeds

As I understand it, in the early days of personal computers, strict FCC limits on RF emissions, were a factor limiting the speed at which data could be transmitted over wires, but I'm trying to ...
18
votes
1answer
1k views

The almost-was Atari IBM PC

One of the more remarkable events in the history of personal computers was IBM contemplating basing their PC on Atari technology. That this was seriously considered, everyone agrees, but it's hard to ...
5
votes
2answers
443 views

Atari 400 vs 800

Apparently when the two Atari 8-bit machines were released, the 400 outsold the 800 2 to 1, which is unsurprising considering they were priced at approximately $500 and $1000 respectively. Indeed, ...
8
votes
2answers
331 views

Do any Atari 8-bit emulators produce the disk / tape I/O sound?

I asked this question several months ago about why did the Atari produce beeping sounds when loading a disk or tape and it seems that it was by design. However, as I've played with a few emulators ...
8
votes
3answers
397 views

Connecting an Atari 130XE to SM124 monitor

I've got an Atari 130XE 8bit computer that has Composite Video Output. Also, I've got an Atari SM124 monitor designed for the Atari ST 16-bit line of computers. If you look at an Atari 130XE packing ...
6
votes
1answer
222 views

What are all the known file extensions for Atari 8-bit disk/tape/cartridge images?

I have a few collections of Atari 8-bit images that I've downloaded over the years, but only cherry picked into them. I'm at the point that I'd like to clean things up a bit and get rid of files that ...
7
votes
3answers
904 views

Atari 800XL, black screen on power on - how to diagnose the problem?

I've got an atari 800 XL that is broken - when I power on, there's no reaction. It seems there is at least something sent to display, as TV detects a signal, and turns full black. The chips are ...
15
votes
3answers
2k views

6510 clock rate of C64: Why was it considerably slower than the 6502 of the Atari 800?

According to Wikipedia, the Atari 8 bit series had a 6502 running at ~1.8 MHz. Why was the clock speed of the 6510 for the C64, which was designed a couple of years later, considerable slower? Was the ...
21
votes
3answers
2k views

Why did the Atari 800 designers choose such a radical system design?

The physical system design of the Atari 800 was pretty radical, when compared to the 3 other canonical home computer designs of the late-1970s: TRS-80 Model 1, PET, and Apple ][. As the photo of the ...
27
votes
5answers
2k views

Does every retrocomputer and console with NTSC composite output have 'artifact color' ability?

Artifact color is heavily associated with the Apple ][, since that is the only method the machine had to produce a color display. I was looking at the fantastic demo for IBM PC + CGA, 8088MPH, and I ...
29
votes
2answers
2k views

How did “Ballblazer” pull off fast, smooth, first-person, solid-model 3D on Atari 8-bits?

I remember the first time I saw Ballblazer, the 1984 game, running on a friend's Atari 800. The split-screen 3d graphics and fast action blew my socks off. Looking back, I get the impression there ...
13
votes
1answer
198 views

Can Extra Joystick Ports be Added to the Atari XL/XE Series of Computers?

The original Atari 400 and Atari 800 machines each had four joystick ports, which was frankly ahead of their time and made for some amazing experiences. M.U.L.E. with four players was an absolute ...
13
votes
1answer
205 views

Will the Atari 800 work without any expansion cards installed?

The Atari 800 had 4 user accessible slots for adding RAM and a ROM card. Normally, your machine came with at least two cards from what I understand. The question is, if I removed all the cards from ...
17
votes
1answer
451 views

Was the Atari 400/800 internal speaker of any use besides key click?

Sounds from the Atari 8-bit computer line came through the RF video cable into your television much like video game systems from the time. The original Atari 400/800 also had a built in speaker, ...
12
votes
3answers
513 views

Troubleshooting and reparing an Atari 800XL with a single key not working

I recently purchased an old Atari 800XL off eBay. The machine was untested/as-is and not guaranteed to work, but it was cosmetically in mint condition with original box, manuals, and even the ...
9
votes
1answer
234 views

Methodology for imaging Atari disks

I have a pretty decent collection of retro computers, but I have always been a Commodore and Apple guy. I recently picked up an Atari 800XL and a 1050 disk drive, so I am investigating the ...
19
votes
1answer
451 views

What did the cassette bootloader in 8 Bit Ataris do?

...or for that matter, what didn't it do, so that you'd use the "bootloader/main program" separation instead of loading everything at once. Normally, when loading games or any non-BASIC software from ...
10
votes
1answer
419 views

Atari 800 CPU - 6502 vs. Sally

Regarding the Atari 800... What's the difference between the 6502A and the 'Sally'? Is it simply a revision, or do the changes improve performance?