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The original Space Invaders ran on an 8080. It had a 256x244 bitmap display turned on its side. What better to do with an Altair than make it an arcade machine? I'm tempted to make it 320x248 instead of 256x248, but we'll see. The display will probably have to be addressed as 8192 pixels wide and 8 ...
by logjam
May Wed 07, 2008 7:44 pm
 
Forum: Creation Room
Topic: 24x24 LED Game of Life...
Replies: 20
Views: 50969

My display will be memory mapped, so as long as the data is in memory it will be displayed. I have some dual port SRAM and a 20MHz shift register for it. I need 60 frames/sec for Space Invaders (long story). There are current controlled drivers for multiplexed LED systems that run $.50 a piece. Stil...
by logjam
May Tue 06, 2008 1:21 am
 
Forum: Creation Room
Topic: 24x24 LED Game of Life...
Replies: 20
Views: 50969

How hard would it be to scale up to 256x256 or 192x99? Would it take a lot more memory or take too much processing power?
by logjam
May Sat 03, 2008 1:49 am
 
Forum: Creation Room
Topic: 24x24 LED Game of Life...
Replies: 20
Views: 50969

I did some programming work on a $85 computer from Thailand. Its a 300MHz 486 SX with ethernet, VGA, serial x 2, etc. It will boot and install linux off of a compact flash card. Looks a bit limited. Internal hard disk and then no WiFi etc? No floating point, which severely limits any x86 software t...
by logjam
Mar Sat 22, 2008 4:51 pm
 
Forum: Venues, projects and off topic stuff - NO SPAM
Topic: TV and/or VGA terminal
Replies: 25
Views: 50013

I did some programming work on a $85 computer from Thailand. Its a 300MHz 486 SX with ethernet, VGA, serial x 2, etc. It will boot and install linux off of a compact flash card. I am also working on a VGA terminal project. I think that I will scrap my other plans and just get some of those $85 compu...
by logjam
Mar Sat 22, 2008 12:18 am
 
Forum: Venues, projects and off topic stuff - NO SPAM
Topic: TV and/or VGA terminal
Replies: 25
Views: 50013

I just finished a simple unit like this, except it plugs into the processor socket. You may be interested in the Flash memory on it. I can help you out with the PLD stuff since it can get confusing if you haven't done it before. My board is a little larger since I have buffers for address and data. ...
by logjam
Jan Mon 28, 2008 5:42 pm
 
Forum: Micro-KIM General Discussion
Topic: New 32K RAM card
Replies: 12
Views: 25392

There is an 8080 and 6800 version.

The 8080 version required 1k of ROM and the 6800 version required 768 bytes. But that is only because the 6800 version used the ACIA monitor ROM for communication.

VTL is faster than basic for computations.
by logjam
Dec Thu 06, 2007 2:33 pm
 
Forum: Software
Topic: Micro-KIM ROM
Replies: 1
Views: 6687

Just off the top of my head, replicating the front panel is not bad, cpld or fpga can handle all the glue logic but the big issue is the stupid 8080A process with a -5V supply requirement. It means multivoltage supply or a converter onboard which takes up much needed space. Z80 is software compatib...
by logjam
Dec Thu 06, 2007 2:30 pm
 
Forum: Micro-KIM General Discussion
Topic: Wohoo, I'm picking my Micro-Kim up on my way from work today
Replies: 5
Views: 9028

He doesn't respond to e-mails any more... :(
by logjam
Nov Wed 28, 2007 3:10 pm
 
Forum: replica 1 General Discussion
Topic: Obtronix apple clone
Replies: 1
Views: 4919

Do you have a reproduction Apple 1 cassette interface to test?

I would think its a clock speed issue, but I would also think that if it were that it would still be able to read back its on recording...
by logjam
Nov Wed 28, 2007 3:06 pm
 
Forum: Creation Room
Topic: Cassette Interface now works!!
Replies: 64
Views: 118551

That Root.sch I posted is for 64 columns. There are 1728 columns total. There are an estimated 8,000 solder joints in the driver boards. I am not looking forward to that.
by logjam
May Thu 17, 2007 4:06 am
 
Forum: Creation Room
Topic: 24x24 LED Game of Life...
Replies: 20
Views: 50969

Not off... :) I found a 5V 90A power supply here: http://www.surpluscenter.com/item.asp?UID=2007051702510729&item=15-1050&catname=electric There is also a new 5v 100A or even 150A supply for $168 or $295 http://www.power-factor-1st.com/shop/enclosed-switching-power-supplies/g2-series/page2.h...
by logjam
May Thu 17, 2007 4:02 am
 
Forum: Creation Room
Topic: 24x24 LED Game of Life...
Replies: 20
Views: 50969

19,008. It is 192x99, or 24x9 characters of 8x11 pixels. I thought I'd be able to refresh 30 rows when I made the boards. I did some tests with my LEDs and found that I could only do a little over 10. I decided to refresh 11 rows at once since that is how many rows are in one character. The display ...
by logjam
May Wed 16, 2007 12:25 am
 
Forum: Creation Room
Topic: 24x24 LED Game of Life...
Replies: 20
Views: 50969

I LOVE a project with LEDs! :) Here is a picture of mine: Front: http://www.stockly.com/images2/060129-LED_Display_Front_2718.jpg Back: http://www.stockly.com/images2/060129-LED_Display_Back_2716.jpg Legs: http://www.stockly.com/images2/060129-Weight_of_39584_Legs_2696.jpg I have not built the drive...
by logjam
May Tue 15, 2007 2:17 am
 
Forum: Creation Room
Topic: 24x24 LED Game of Life...
Replies: 20
Views: 50969

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