tag:blogger.com,1999:blog-115687982024-02-03T04:35:25.768-06:00Jim's Color Computer ProjectsThis is a place for me to start keeping track of all the different little projects that I have going with my Tandy Color Computers and hardware.Jimhttp://www.blogger.com/profile/06526750126342570761noreply@blogger.comBlogger11125tag:blogger.com,1999:blog-11568798.post-51577640474841787422020-01-18T21:52:00.000-06:002020-01-18T22:17:11.434-06:00
When SALT goes bad
While trying out my new CoCo SDC with my Color Computer 3, I found some strange issues. Symptoms included garbage on the screen while turning on, garbage after hitting reset, computer not initializing with any text. Any cartridge inserted would cause the system to not display any video. I also noticed something odd, the usual double click of the cassette relay Jimhttp://www.blogger.com/profile/06526750126342570761noreply@blogger.com0tag:blogger.com,1999:blog-11568798.post-34780321270138019782008-03-31T21:37:00.000-05:002008-03-31T21:37:55.773-05:00Photos: Cracking open the TRS-80 | CNET News.comI found this site interesting. They have cracked open a TRS-80 Color Computer 2 and have the pictures. This is a very recent posting, Feb 2008.Photos: Cracking open the TRS-80 | CNET News.comJimhttp://www.blogger.com/profile/06526750126342570761noreply@blogger.com2tag:blogger.com,1999:blog-11568798.post-1116132328290099762005-05-14T23:34:00.000-05:002005-05-14T23:47:20.523-05:00More Ethernet Project DetailsThe current plan is to use a 3Com 3c509B ISA Ethernet card with the hardware that I plan to build and finally give the Color Computer Ethernet capabilities. One advantage of the 509B card is that is has off-loading capabilities in hardware for checksums. The 6809 in the CoCo can use all the help it can get! The other thing about this card is you can purchase them cheap from eBay. At least a year Jimhttp://www.blogger.com/profile/06526750126342570761noreply@blogger.com0tag:blogger.com,1999:blog-11568798.post-1115476955698301292005-05-07T09:41:00.000-05:002005-05-07T09:42:35.770-05:00Still no further Ethernet project progressI have at least been adding internet links of interest :) check some of them out if you are looking for something new!Jimhttp://www.blogger.com/profile/06526750126342570761noreply@blogger.com0tag:blogger.com,1999:blog-11568798.post-1114226956675653432005-04-22T22:25:00.000-05:002005-04-22T22:29:16.676-05:00Internet Access Broke - AgainI know this has nothing to do with my project here, but I need to vent. Looks like my previous internet provider isdn.ws is long gone. They are no longer on the internet and I cannot dial in to my account. So rather than work on my project this Thursday and Friday I had to search for internet access (128K ISDN). Luckly I found dedac.com and was able to get setup again with 128k ISDN service Jimhttp://www.blogger.com/profile/06526750126342570761noreply@blogger.com0tag:blogger.com,1999:blog-11568798.post-1113538000917549032005-04-14T23:05:00.000-05:002005-04-14T23:06:40.916-05:00Busy, Busy, BusyToo much going on here lately. No progress to report, but I would rather report no progress rather then have no posts at all :)Jimhttp://www.blogger.com/profile/06526750126342570761noreply@blogger.com0tag:blogger.com,1999:blog-11568798.post-1111713410448581012005-03-24T19:14:00.000-06:002005-03-24T19:16:50.450-06:00Proposed Ethernet Board LayoutHere is sample of how the board will be layed out:Jimhttp://www.blogger.com/profile/06526750126342570761noreply@blogger.com0tag:blogger.com,1999:blog-11568798.post-1111460867702961362005-03-21T20:59:00.000-06:002005-03-21T21:07:47.706-06:00Design notes Use a frequency of 4Mhz for the SPI bus. This will allow the Mega8 Atmel AVR chip to communicate over the same SPI bus as the MMC/SD cards will. Have a way to disconnect the SPI pins from the programmable logic chip so that in system programming of the Mega8 part can occur. Use a two byte 'window' for the ISA bus port. This will allow for 6809 assembly instructions such as LDD and STD toJimhttp://www.blogger.com/profile/06526750126342570761noreply@blogger.com0tag:blogger.com,1999:blog-11568798.post-1111455814507564472005-03-21T19:37:00.000-06:002005-03-21T20:59:05.336-06:00WinCupl download and installInstalled and configured latest version of WinCupl from Atmel web site (version 5.30.4). For this project I am going to use the same CPLD part (Atmel ATF1508AS 84 pin PLCC 20ns part). According to the WinCupl fitter tool there are 50 percent of the I/O pins still available and only 20 percent of the internal logic is being used. This should allow for the ISA bus logic to be included in the same Jimhttp://www.blogger.com/profile/06526750126342570761noreply@blogger.com0tag:blogger.com,1999:blog-11568798.post-1111372655560875702005-03-20T20:37:00.000-06:002005-03-20T20:37:35.560-06:00CPLD WorkWorked further on CPLD pinout for ISA bus to COCO bus.Jimhttp://www.blogger.com/profile/06526750126342570761noreply@blogger.com0tag:blogger.com,1999:blog-11568798.post-1111291778091676792005-03-19T22:07:00.000-06:002005-03-19T22:09:38.093-06:00Start of Ethernet ProjectStarted an online record of my work to bring ethernet to the Color Computer 3 using OS-9 and my custom hardware.Jimhttp://www.blogger.com/profile/06526750126342570761noreply@blogger.com0