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Topic: Working Apple 1 replica (Read 3118 times) |
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vbriel
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Replica 1 is HERE!
 
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Re: Working Apple 1 replica
« Reply #15 on: Mar 11th, 2003, 1:00pm » |
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Just wanted to update ya'll. I'm working with a guy in california to produce a proper 40X24 display onto TV. It has to be this way, no other solution is authentic.
Also, there has been a lot of discussion about the design. While I was off being creative trying to reinvent the wheel and make my project with modern technology, other people were telling me to keep it completely original, even as far as the board layout. While this is nearly impossible due to the fact that many chips on the Apple I are no longer produced, there may be a way to get by that, so....
After I have completed the replica and I'm ready to make any boards for anybody who wants them, I'm going to start on an identical clone version that will only replace the parts that are not accessable anymore with a suitable replacement.
By the way, does anybody know if there were any special functions in the video section of the Apple I such as being able to clear the screen, or set the cursor to top of page? If so, could you let me know so that I keep the replica in exact original functionality.
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StuartBell
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Re: Working Apple 1 replica
« Reply #16 on: Mar 25th, 2003, 1:27am » |
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Just a thought from an old Apple ][ owner: After a supply surge hit one of my ][s, I replaced half the ICs on the logic board until it worked again as, ISTR., they were all socketed. Since the II wasn't that long after the I, could IIs be used as donor machines for some of the no-longer-available-new ICs?
Stuart
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Stuart Bell,
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Trash80toG-4
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Re: Working Apple 1 replica
« Reply #17 on: Mar 25th, 2003, 7:05am » |
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I still think it would be a lot of fun to break the board layout out to a large scale so that the unavailable ICs could be reproduced from discrete components. It's be more af a techno artwork, but it'd make building one a real electronics project, sort of like the old HeathKits. 
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vbriel
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Re: Working Apple 1 replica
« Reply #18 on: Mar 26th, 2003, 3:10pm » |
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on Mar 25th, 2003, 1:27am, StuartBell wrote:Just a thought from an old Apple ][ owner: After a supply surge hit one of my ][s, I replaced half the ICs on the logic board until it worked again as, ISTR., they were all socketed. Since the II wasn't that long after the I, could IIs be used as donor machines for some of the no-longer-available-new ICs?
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I have several II's and that wouldn't solve the problem. The rare chips were out of production shortly after the 1 wasn't produced. If I read my history about the Apple 1's correctly from this site, owners had a real problem getting replacement chips even after only a few years after production.
Trash - Artwork would be good, but I still like the idea of being able to build a computer that only a few have ever used.
Oh, and much progress has been made on TV video for the project. I should have more info by the end of next month.
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Trash80toG-4
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Re: Working Apple 1 replica
« Reply #19 on: Mar 26th, 2003, 6:03pm » |
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on Mar 26th, 2003, 3:10pm, vbriel wrote:| Trash - Artwork would be good, but I still like the idea of being able to build a computer that only a few have ever used. |
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It'd still be an Apple I, the artwork/electronics angle would be in the reproduction of the functional equivalent of the unavailable IC's from discrete components, course you'd need a bigger power supply for just those ersatz ICs!
Matter of fact, it'd be a much more PURIST CORRECT A1!
jt
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vbriel
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Re: Working Apple 1 replica
« Reply #21 on: Apr 3rd, 2003, 3:22am » |
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Thanks, sorry about that
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iceandfire
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Re: Working Apple 1 replica
« Reply #22 on: Apr 5th, 2003, 3:50pm » |
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on Mar 11th, 2003, 1:00pm, vbriel wrote:| By the way, does anybody know if there were any special functions in the video section of the Apple I such as being able to clear the screen, or set the cursor to top of page? If so, could you let me know so that I keep the replica in exact original functionality. |
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There were no special functions in the video of the Apple-1. The screen could not be cleared(except by repeated Carriage Returns), and no way to put the cursor at the top of the page except by manually pressing the CLEAR SCREEN button.
The Apple-1 BASIC disassembly shows some special video functions, but Woz added those for the future Apple II. As far as I know there is no way to do these things with the shift registers of the Apple-1.
Larry Nelson
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Larry Nelson
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vbriel
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Re: Working Apple 1 replica
« Reply #23 on: Apr 5th, 2003, 7:24pm » |
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Larry,
Do you have a printout of basic for the Apple 1? I've been trying to get a copy for a while now. Also, if you have a printout of the cassette interface source code that would be even better! I may see if I can load your copy of basic from your web site onto an apple II and dump it. If I can, then I'll post the listing. Not sure if the A1 used the same encoding for sound as the A2's but it's worth a shot. 
Thanks for the update on the video. I was pretty sure that was the case, and since I've only seen my replica in operation I just wanted to verify the process.
All is going as planned with the design. I just ordered a prototype board for my replica. The video will be 40 X 24 just like the original 1. I have run into a problem trying to find new 44 pin edge card connectors like what was used in the Apple II slots and the Apple 1 expansion. If anybody knows of a source and part # please let me know. My prototype doesn't have the expansion port on it, but the final design will.
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| « Last Edit: Apr 5th, 2003, 7:36pm by vbriel » |
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iceandfire
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Re: Working Apple 1 replica
« Reply #24 on: Apr 7th, 2003, 5:30am » |
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I have a couple of (used) 44 pin edge connectors in my junk box. If you cannot find any new ones, I'll send these to you.
I have a disassembly of the BASIC for Apple-1, compliments of Achim Breidenbach. I'll try to e-mail it to you as it is too large for posting here. Anyone else want a copy? If so, maybe we can post it on the Apple-1 Members Site.
Larry
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Larry Nelson
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Tom Owad
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Re: Working Apple 1 replica
« Reply #25 on: Apr 7th, 2003, 12:39pm » |
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on Apr 7th, 2003, 5:30am, iceandfire wrote:| I have a disassembly of the BASIC for Apple-1, compliments of Achim Breidenbach. I'll try to e-mail it to you as it is too large for posting here. Anyone else want a copy? If so, maybe we can post it on the Apple-1 Members Site. |
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I sure would. I think you have an account, and if so, feel free to upload it. Alternatively, you can email it and I'll upload it.
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Tom Owad
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vbriel
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Replica 1 is HERE!
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Re: Working Apple 1 replica
« Reply #26 on: Aug 21st, 2003, 1:48pm » |
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At long last after taking a few breaks with real life stuff to do, I finally have some pics of the replica with full working video. The board on my website is a prototype without the ps/2 keyboard adapter section. I have since revised the design and the final prototype board will impliment either a Apple II/II+ keyboard or a standard ps/2 pc keyboard with an adapter I designed.
Take a look at the pics and let me know what you think!
http://www.vintagecomputer.tk
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| « Last Edit: Aug 21st, 2003, 1:49pm by vbriel » |
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iceandfire
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Re: Working Apple 1 replica
« Reply #27 on: Aug 22nd, 2003, 4:25am » |
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Official Attaboy
I know that you have spent many frustrating hours on this project, but the results are fantastic! You are to be commended for a great job.
Keep up the good work. Congratulations, and let me know if I can help in your future projects!
Larry
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Larry Nelson
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vbriel
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Replica 1 is HERE!
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Re: Working Apple 1 replica
« Reply #28 on: Aug 23rd, 2003, 8:28am » |
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Thanks, yes I spent more time on it than a lot of people felt I should have. I'm currently running into a small isue of the RAM space used on the Apple 1 for cassette basic. It occupies location $D000-DFFF. The problem is I have used that space for EEPROM. My thinking was that if somebody wanted to they could program basic into the EEPROM in that location.
I have not tried this and I'm worried that basic used some locations in RAM between $D000-DFFF to store variables or something. If basic never writes to this area everything is good, otherwise I have to make mods on the board.
I tried typing in all 4K of basic from your text at location $7000-7FFF but it did not work. I changed all jmp commands to jump to high address of $7xxx and that should have worked but it freezes up on me.
I know there was one error in the listing, and I'll go back and check to see if I can find more.
Cassette Interface: We'll I never got my hands on the proms on the board to reproduce it, so that hasn't been done yet. All components on the board can be obtained still so I just need the source code off of the proms to reproduce it. That code was not freely distributed by Woz so I'm sure Apple would complain.
44-pin card connector: just unavailable anymore. Everything is 50 pin, the 44's are special order in too large of quantities for me to get at this time. I'm making the expansion interface a standard 40 pin HD connector that can interface to a hobby board or anything else that gets designed.
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iceandfire
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Re: Working Apple 1 replica
« Reply #29 on: Aug 24th, 2003, 7:56am » |
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I don't think you would run into any problems using the D000 to DFFF space for an eeprom except the keyboard and video PIA was at D010, D011, D012 and D013. There was no RAM storage in the original Apple-1 in the D000-DFFF area.
The Apple BASIC could be re-written for another location. In addition to changing direct references, the various tables in the program would have to be re-worked, and some locations in page Zero are loaded with pointers for indirect jumps and table addresses that would have to be changed. The storage location for the BASIC programs is usually in the 0800 to 0FFF area but can be changed to about any contiguous area.
Let me know if I can help.
Larry
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Larry Nelson
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