You are not logged in.
Lost Password?

All Posts (XSF04)




#1
Re: SELFMADE GAME CARTRIDGES
Posted on: 2004/8/2 18:35
Newbie
Joined 2004/7/28
USA
3 Posts
Long Time User (15 Years)
JMO,

Well then if you are starting your own company you probably mean that you know how to make dev cart. I would like to get your opinion on a previously posted question by me.

Ive made dev cart in the past for NES and Gamegear... they work great so I wouldnt say im a complete newbie to this but im clueless when it comes to work with TWO EPROMS and HI LOW BYTES...

Can someone explain me and give me and schematics example of anything working with 2EPROM...

I would also need more information about Hi low bytes programming what is it exactly? does even and odd bytes are separated in two files or first half and second half of a file is splitted?

How big my eproms size needs to be if my rom is 1024kbs or 512kbs.

Thanks to anyone who will answer

XSF04
Top

Topic | Forum


#2
Re: DEV CART QUESTION.
Posted on: 2004/8/2 18:35
Newbie
Joined 2004/7/28
USA
3 Posts
Long Time User (15 Years)
JMO,

Well then if you are starting your own company you probably mean that you know how to make dev cart. I would like to get your opinion on a previously posted question by me.

Ive made dev cart in the past for NES and Gamegear... they work great so I wouldnt say im a complete newbie to this but im clueless when it comes to work with TWO EPROMS and HI LOW BYTES...

Can someone explain me and give me and schematics example of anything working with 2EPROM...

I would also need more information about Hi low bytes programming what is it exactly? does even and odd bytes are separated in two files or first half and second half of a file is splitted?

How big my eproms size needs to be if my rom is 1024kbs or 512kbs.

Thanks to anyone who will answer

XSF04
Top

Topic | Forum


#3
DEV CART QUESTION.
Posted on: 2004/7/28 5:11
Newbie
Joined 2004/7/28
USA
3 Posts
Long Time User (15 Years)
Hello guys I have a question concerning making a dev cart for VB,

First of all I'm really not an electronics expert here my issue,

As per David Tucker plan/schematics I made my own dev cart I made it twice completly and I'm totally sure that there is absolutely no short. I also use two 32pins EPROM (27c801 from ST) for making this cart. Now the thing is that I'm not too comfortable with Hi-low byte programming. That probably why I have a small issue to make this working. Just as an information I use a USTR eprom programmer which is offering the possibility to program Hi and Low byte eprom.

There is few things about this schematics
http://dana.ucc.nau.edu/~dbt/img/32pin.gif
that im not sure first;

Lets consider that C(X) means the connector edge pin for VB cart.
And that E(1) and E(2) are eproms.

All my issues are regarding working with 2 EPROMS.
This should be correct for EP(1)
C(D0) to E(1)D0 and so on until C(D7) to E(1)D7.

How do I start with E(2) Do I solder (E2)D0 to C(D8) or to C(D15)? What is the order for the datapins on the second eprom (high). In other words
EP(2)D0 to C(D8)
EP(2)D1 to C(D9)
EP(2)D2 to C(D10)
...
or
EP(2)D0 to C(D15)
EP(2)D1 to C(D14)
EP(2)D2 to C(D13)
...

and last thing is about /OE and /CE pins Chip enable...

Do I connect

C(CE) to E(1)CE AND E(2)CE
C(OE) to E(1)OE AND E(2)OE
I think this would be correct but unsure...
or
C(CE) to E(1)OE and E(2)OE
C(OE) to E(1)CE AND E(2)CE

What about the DEMO game size and EPROM size? If demo is 1024kb do I take 2 27C801-1024kb or 2 27C040-512kb because of the Hi low ...

and what is exactly hi byte low bytes programming is this about splitting EVEN and ODD bytes or splitting First half and second half of a file.

Thanks for reading this poor and exhaustive newbie question;)

Any other than David tucker schematics around for a 2eprom 32pins 27C801? dev cart for vb?

Kind regards

XSF04

Post Edited (07-28-04 06:40)
Top

Topic | Forum