acadiel

I have a love hate relationship with those PLCC sockets.

I have a /4 in my basement. Don't know what's wrong with it (maybe the 9918), but it will only output black and white.

If you want 50 of them, here's some 3.5" ones on Amazon... http://www.amazon.com/Single-Ply-Thermal-Paper-Rolls-Carton/dp/B00IGWIFYM/ref=sr_1_1?s=office-products&ie=UTF8&qid=1399481941&sr=1-1

I have another one in the 3D printer and will pick it up in a few days. Will mail it to you and you can use it.... You will just have to take the filler out. :-)

Yep. With the 74LS378/74LS379, a write to ROM actually switches the 8K bank in the EPROM. http://www.avjd51.dsl.pipex.com/ti/ti.htm#bank_switching

When Tursi and I created the 512K 8K ROM multicart, we found quite a few games that wrote to ROM to bank switch, either as bugs, or possibly a rudimentary copyright protection. It was too common (I think we found four or five like that) to be a coincidence.

Assembled....

top....

Bottom:

V 3.0.....

Thus sayeth my oldest daughter....

Anyone know who the bidder is that put $900 on it? Is it this guy? http://www.suddenlink.net/pages/curtismc/cc40.htm m***c( 961) US $900.00 May-03-14 05:54:13 PDT They also bidded on the WafterTape auction: RARE TI WAFERTAPE DRIVE HX-2000 HEXBUS TI-99/4A TI-99/8 CC-40 TEXAS INSTRUMENTS a***s( 168) US $359.00Feb-12-14 22:47:00 PST m***k( 2863) US $354.00Feb-12-14 19:18:58 PST m***k( 2863) US $260.00Feb-12-14 08:18:29 PST y***e( 2325) US $245.58Feb-12-14 16:30:08 PST m***c( 961) US $225.00Feb-12-14 13:21:48 PST m***c( 961) US $175.00Feb-12-14 09:15:41 PST e***m( 2735) US $136.66Feb-11-14 09:14:26 PST e***t( 205) US $25.49Feb-06-14 06:04:41 PST a***s( 168) US $25.00Feb-06-14 03:14:12 PST Starting Price US $24.99Feb-05-14 22:48:58 PST

http://www.ebay.com/itm/Texas-Instruments-CC40-Computer-Development-System-/181398206886?pt=US_Vintage_Computing_Parts_Accessories&hash=item2a3c2cf9a6 Someone needs to bid on this...

Yep! And just like the other ones; there's generics and there's good ones. :-)

Yep. I had to get rid of those cheap Chinese $10 deals and actually spend like $35 for one. I can simply push it in the socket, and the socket around it elevates. When done, push the socket around the chip down, and the chip pops out. Works TONS better. The sockets themselves on the boards, though... I have had flakiness with those periodically as well, but not near as often as the programmer DIP adapter. Something like this... but mine was a "name brand" one; I just can't find one on eBay. http://www.ebay.com/itm/YAMAICHI-PLCC32-PLCC-32-Pin-To-DIP32-MCU-Adapter-SP32-/280758952140?pt=LH_DefaultDomain_0&hash=item415e89a0cc

So the non-backwards one works on your physical cart? I'll try it on mine and see what it does. If Gazoo put the first/last bank the same (or did a "write to >6000 header") it should come up on either variant of 378.

Congratulations, everyone! I'm much in agreement that all three of you have done an excellent job! Who would know 35 years later we would still have people messing with this old computer :-)

I'm just still impressed that someone took the carts with GROM and ROM and still managed to get them to run in 32K (like Parsec). I'd love to see how it loads the different parts into 32K.

Was Commodore the only one that used those nonstandard DB 23 connectors? I wonder if they got a huge lot of those suckers at a basement bargain price and just decided to use them because of that.

If you do, throw it my way, please, so I can hack at it and make my sidecar board too. :-) Thanks!!! :-)

Yep, and the ones on the side are typically ROM carts that are not banked, or also live in the DSR or memory expansion space. I believe ROMG* (pin 34) was used in the 74LS378 somehow for our bank switching scheme, but can't verify unless I pull up ExpressPCB. About the GROM decoding circuity, yeah, that's why I wanted to just bring the seven signals to the cart port so we can just pull from them all there. :-)

We'd have to figure out how to obtain the missing ROMG* signal (and the GROM ones) on the side though. I don't know how easy those are to generate? (Obviously, you can get around it like with the PGRAM and HSGPL).

Yes, there are five that come to mind: RESET (note the side port has RESET*) GROM select* GROM clock GROM ready ROMG* (active low if cart rom is used) These are not present on the side port.

Digikey has 138 :-) http://www.digikey.com/product-detail/en/5-5530843-4/A31723-ND/770549

No they aren't too hard to find... http://www.newark.com/jsp/search/productdetail.jsp?SKU=42K9934