Atari 800XL. Adding a missing power supply.
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- Опубликовано: 29 сен 2024
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Happy New Year everyone. It's time for a new system for me, the Atari 800XL. I don't know much about Atari's 8-bit lineup of machines, So when I spotted this 800XL with accessories for sale at the Annual Retro Börse, I grabbed it. While the Accessories are nice, the machine is missing its power supply. Let's fix that today and see if this machine was a bargain or a lemon.
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The 6502 in the Atari was a custom design to allow the ANTIC chip to stop the CPU and take over the memory bus for direct screen addressing. The problem with your black screen could also be the MMU (memory management unit) not selecting the Basic ROM. If you don't mind dealing with overseas shipping, a new Basic ROM can possibly be ordered from Best Electronics in the US. They are one of two companies that bought out stocks of parts from Atari when they went out of business. Another option is to burn an EEPROM with the basic code but it will require a little finagling to remap the socket wiring to match the EEPROM. Finally, perhaps you can locate an original Basic Cartridge from a 400 or 800 computer and insert the ROM from the cartridge in the motherboard. The EEPROM is the best option as you can burn a copy of Altirra Basic which features a fast floating point and other improvements over the original Atari Basic. Altirra Basic is open source so no copyright concerns. Altirra is also 100% compatible with Atari Basic and removes known bugs in Atari Basic.
Thanks for the reply. I knew the 6502C in the Atari was a custom design, but was t certain what the difference was. As for the roms, yeah I’m burning a new basic rom with a converter board to run a 28C64 in place of the original. It should be ok I hope, but that’s for part 2!
ATARI 5200 HAD MAJOR PLANS TO COMPETE WITH COLECOVISION/ADAM
Are you sure its the ROM's fault? Cartridges bypass system memory so the issues could easily be a RAM chip. In most of the cases I had with Atari 8bit machines the issue was the RAM.
Honestly, no. From what I’ve read, there are various reasons the 800XL black screen could be anything from Roms, pokey, cpu and more. Given that when I add the cartridge the machine works as expected, with full sound and graphics, that tells me the basics like the cpu, pokey and antic are working. Since all the cartridge does is bypass the basic Rom, it seems like a good place to start. If it’s not That, then mores the fun. Learning from an incorrect assumption is awesome.
The Atari X was the legend that never materialized. It was the 800 in 5200 Keyboard color of black accessory for the U.S. exclusively.
The unintuitive numbering of pins on DIN connectors is purely a historical thing. These connectors started out as 3-pin (1-2-3) for mono playback and (optionally) recording. Then two additional pins were added in between for the right channel on stereo playback & recording, making it 1-4-2-5-3. Two more, and we've got those weird 6 and 7 on the top, and if you want, go all the way with 8 in the middle. Yay!
I knew someone would know. And it makes sense, and yet so silly at the same time. :)
Hmm, if it is the Atari BASIC chip (as the cartridge worked), I'd suggest to simply create your own EPROM chip with Turbo BASIC XL by Frank Ostrowski instead - it's better & faster, yet still fully compatible with the original.
Thanks. I may try that.
The 400 and 800 were replaced by multiple computers with the same technology and different presentation. The 1200XL was released in early 1983 to supplant the 800. It was discontinued months later and succeeded by the 600XL and 800XL. After the company was sold and reestablished, Atari Corporation released the 65XE (sold as the 800XE in some European markets) and 130XE in 1985.Yes, the Atari 65XE can load Atari 800XL games using the Translator Disk, a floppy disk that loads older OS versions into the XL/XE computers. The XL/XE models have OS revisions that can cause compatibility issues with certain software. The Translator Disk can load the older 400 and 800 Rev. 'B' or Rev. 'A' OS into the XL/XE computers.
Are you delivering enough power through the usb. As the cartrage doesnt require as many amps as half the chips on the computer are not used.
Yup. Initially I had a standard 1A 5V charger, but the testing on screen was done with a 2.4A 5V charger. I’ll know more next week I hope. Side note, love the user name. Who doesn’t love the Twotter. :)
ATARI800XL - my dream from childhood.
I only discovered the 800 XL a few years ago. I really like the machine so far.
good looking box !
Own one from 1986. Croatia old comp. Lover😊
Nice. I only discovered the Atari 8-bit line a few years ago, but I’m already loving the design.
@@techdeptdesign, quality and finctionality etc. For me, it's machine of decade 😊