Iwantgames:) Posted July 2, 2015 Share Posted July 2, 2015 Got my CoCo 2 today Mega Bug is alot of fun haven't tried my other games yet. Looked up my model number online and figured out how to upgrade it to 64k and found a source for the chips but where would I find the extended basic chip? Quote Link to comment Share on other sites More sharing options...
MarkO Posted July 3, 2015 Share Posted July 3, 2015 Got my CoCo 2 today Mega Bug is alot of fun haven't tried my other games yet. Looked up my model number online and figured out how to upgrade it to 64k and found a source for the chips but where would I find the extended basic chip? A lot of CoCo related Upgrades are sold at Cloud 9 Tech. You might try contacting them to see where the ROM can be located.. I have a CoCo 3 128K and a CoCo 2, 64K Extended BASIC. And I a fairly new to CoCo's. ( I have been a Long Time Apple ][ User ) MarkO Quote Link to comment Share on other sites More sharing options...
Iwantgames:) Posted July 3, 2015 Author Share Posted July 3, 2015 (edited) I found the Extended Basic 1.1 rom file just can't program chips :/ Edited July 3, 2015 by Iwantgames:) Quote Link to comment Share on other sites More sharing options...
Iwantgames:) Posted July 3, 2015 Author Share Posted July 3, 2015 Messaged Cloud 9 & another rom burning service hopefully one can do it Played Mega Bug for over a hour good fun. Demolition derby's kinda fun too, wildcatting I have no clue what I'm doing Quote Link to comment Share on other sites More sharing options...
MarkO Posted July 3, 2015 Share Posted July 3, 2015 I found the Extended Basic 1.1 rom file just can't program chips :/I will need to see what EPROM is needed, but I have access to EPROM burners, as well as others here.. MarkO Quote Link to comment Share on other sites More sharing options...
Iwantgames:) Posted July 3, 2015 Author Share Posted July 3, 2015 I will need to see what EPROM is needed, but I have access to EPROM burners, as well as others here.. MarkO Its a 8k 24pin chip, original part number 8040364b Quote Link to comment Share on other sites More sharing options...
MarkO Posted July 3, 2015 Share Posted July 3, 2015 Its a 8k 24pin chip, original part number 8040364b I meant what EPROM is Pin Compatible with the Extended BASIC ROM.. MarkO Quote Link to comment Share on other sites More sharing options...
jhd Posted July 3, 2015 Share Posted July 3, 2015 I was not aware that any Coco 2s shiped without Extended BASIC. Does it have BASIC v. 1.1 or v. 1.2? Quote Link to comment Share on other sites More sharing options...
Iwantgames:) Posted July 3, 2015 Author Share Posted July 3, 2015 Oh lol, I know zip about eproms so not much help 1 Quote Link to comment Share on other sites More sharing options...
Iwantgames:) Posted July 3, 2015 Author Share Posted July 3, 2015 It has basic 1.2, and a empty socket for the extended basic chip Quote Link to comment Share on other sites More sharing options...
MarkO Posted July 3, 2015 Share Posted July 3, 2015 (edited) I was not aware that any Coco 2s shiped without Extended BASIC. Does it have BASIC v. 1.1 or v. 1.2? This box would indicate otherwise. I would guess that if they came with 64K, they were Extended too.... This page is quite handy too: Welcome to Techno's CoCo 2 Model Summary!. It appears that non-Extended BASIC CoCo 2's are models, 26-3026, 26-3134, 26-3134A, & 26-3134B.and there was a corresponding 16K RAM version with the Extended BASIC MarkO Edited July 3, 2015 by MarkO Quote Link to comment Share on other sites More sharing options...
MarkO Posted July 3, 2015 Share Posted July 3, 2015 Oh lol, I know zip about eproms so not much help I don't know a lot either, but I know enough that if they have the same number of Pins, they are not necessarily compatible... The Apple ][gs, ROM 00 and ROM01, you can buy a standard EPROM to replace the ROM, but the Pins are in a different Order, so an Adapter Board must be made.. MarkO Quote Link to comment Share on other sites More sharing options...
Iwantgames:) Posted July 3, 2015 Author Share Posted July 3, 2015 (edited) I read that there was: 16k standard 16k extended And 64k extended versions of the coco 2 The board is easily upgradeable (if you can find chips) as everything is socketed at least on this on anyways Edited July 3, 2015 by Iwantgames:) Quote Link to comment Share on other sites More sharing options...
Iwantgames:) Posted July 3, 2015 Author Share Posted July 3, 2015 Yeah I used that model summary to figure out which chips I'd need for 64k upgrade which those are easy to find. Unlike the Ext basic. Quote Link to comment Share on other sites More sharing options...
Mr SQL Posted July 3, 2015 Share Posted July 3, 2015 Once you've upgraded to 64k it is possible to switch the machine to all RAM mode; there's an exec command that mirrors the ROM map into RAM (the CoCo only lets you access 32k anyway). Then you can just load BASIC from tape Quote Link to comment Share on other sites More sharing options...
JamesD Posted July 3, 2015 Share Posted July 3, 2015 Once you've upgraded to 64k it is possible to switch the machine to all RAM mode; there's an exec command that mirrors the ROM map into RAM (the CoCo only lets you access 32k anyway). Then you can just load BASIC from tape The Dragon 64 and Tano Dragon would copy ROM to RAM and give you more memory for programs if you typed EXEC when you first start it up but the CoCo does have that build into the ROM. Quote Link to comment Share on other sites More sharing options...
Iwantgames:) Posted July 3, 2015 Author Share Posted July 3, 2015 Hmm wonder how hard it is to find a extended basic tape, of course then I'd have to wait to load it everytime before I could do anything but it's a option Quote Link to comment Share on other sites More sharing options...
MarkO Posted July 3, 2015 Share Posted July 3, 2015 Hmm wonder how hard it is to find a extended basic tape, of course then I'd have to wait to load it everytime before I could do anything but it's a option The ROM's are here, and probably a few other places.. With an EPROM Burner and the right EPROM, your as good as Extended from the beginning. MarkO Quote Link to comment Share on other sites More sharing options...
Iwantgames:) Posted July 3, 2015 Author Share Posted July 3, 2015 Just need a burner and eprom and figure out how to do it Quote Link to comment Share on other sites More sharing options...
Iwantgames:) Posted July 3, 2015 Author Share Posted July 3, 2015 http://www.ebay.com/itm/MOT-MCM68766C35-DIP-24-B192-8BIT-UV-ERASABLE-PROM-/271786295401 Would this one work? I found the part number looking on here : http://www.coco3.com/community/1994/03/24-pin-eproms/ Quote Link to comment Share on other sites More sharing options...
MarkO Posted July 3, 2015 Share Posted July 3, 2015 (edited) http://www.ebay.com/itm/MOT-MCM68766C35-DIP-24-B192-8BIT-UV-ERASABLE-PROM-/271786295401 You would think they could get a Picture that was in Focus..... Would this one work? I found the part number looking on here : http://www.coco3.com/community/1994/03/24-pin-eproms/ That seems like it could be Correct... The 68766 can replace the ROM in the Disk Drive Interface, it seem reasonable it might be the same in the Computer itself. I have some of those: 10PC MCM68766C35 MOTOROLA 8K x 8 350NS NMOS EPROM I got them a year ago, ( 11-JUL-2014 actually ), but my EPROM Burner doesn't program them, I have been told I need a bigger Power Supply.. Let me see if I can locate a 15-24 VAC Power Supply... Then I can test Burning the MCM68766 again. MarkO Edited July 3, 2015 by MarkO 1 Quote Link to comment Share on other sites More sharing options...
Mr SQL Posted July 4, 2015 Share Posted July 4, 2015 The Dragon 64 and Tano Dragon would copy ROM to RAM and give you more memory for programs if you typed EXEC when you first start it up but the CoCo does have that build into the ROM. hmmmm... try exec &hff010 on a 64k coco2. You should get the BASIC prompt in all RAM mode, and POKE 65495,0 will no longer cause a speed increase since it only increases ROM access speed. Quote Link to comment Share on other sites More sharing options...
JamesD Posted July 4, 2015 Share Posted July 4, 2015 hmmmm... try exec &hff010 on a 64k coco2. You should get the BASIC prompt in all RAM mode, and POKE 65495,0 will no longer cause a speed increase since it only increases ROM access speed.FF010 has too many digits Quote Link to comment Share on other sites More sharing options...
Iwantgames:) Posted July 4, 2015 Author Share Posted July 4, 2015 Stephen from Hobbyroms just got back to me, he is able to program the mcm68766c35 and has some in stock 1 Quote Link to comment Share on other sites More sharing options...
jhd Posted July 5, 2015 Share Posted July 5, 2015 It appears that non-Extended BASIC CoCo 2's are models,26-3026, 26-3134, 26-3134A, & 26-3134B.and there was a corresponding 16K RAM version with the Extended BASIC I learn something new everyday :-) Quote Link to comment Share on other sites More sharing options...
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