Thanks for all the info.
I will give it a try in the next couple days.
I am clear now on the ROMCS.
So I don't have to do anything with A15 if I only want 8K to 32K ?
Thanks again,
Bean
Search found 73 matches
- Wed Sep 13, 2023 12:06 am
- Forum: Hardware
- Topic: How to do internal RAM mod for 8-16K area ?
- Replies: 6
- Views: 951
- Tue Sep 12, 2023 8:17 pm
- Forum: Hardware
- Topic: How to do internal RAM mod for 8-16K area ?
- Replies: 6
- Views: 951
How to do internal RAM mod for 8-16K area ?
I have the 62256 32K RAM chip and I have found schematics for 16-32K and 48-64K areas. I would like to have RAM from 8K thru 32K so that the 8-16K area doesn't get erased when resetting. (I will do the battery backed option). I believe the ROM repeats in the 8-16K area, so do I need to pull "ROM CS"...
- Wed Nov 16, 2022 3:31 pm
- Forum: Development
- Topic: What is important in a sprite library ?
- Replies: 4
- Views: 1160
Re: What is important in a sprite library ?
Thanks Greg, I'll take a look at it.
Bean
Bean
- Tue Nov 15, 2022 5:32 pm
- Forum: Development
- Topic: What is important in a sprite library ?
- Replies: 4
- Views: 1160
Re: What is important in a sprite library ?
Here is just a simple demo of how it will work.
Bean
Bean
- Tue Nov 15, 2022 1:57 am
- Forum: Development
- Topic: What is important in a sprite library ?
- Replies: 4
- Views: 1160
What is important in a sprite library ?
I am working on a sprite library for the 16K ZX81. It uses a video interrupt handler to place the sprites, when you move the sprite it puts back what was under the sprite. Right now it only handles a single 1 character sprite, but I plan to make it handle two 1 character sprites and two 3x2 sprites....
- Fri Nov 12, 2021 3:44 pm
- Forum: SALES
- Topic: ZXPAND for sale
- Replies: 14
- Views: 6841
Re: ZXPAND for sale
Not much interest here, I will be putting it on ebay.
- Mon Nov 08, 2021 3:17 am
- Forum: SALES
- Topic: ZXPAND for sale
- Replies: 14
- Views: 6841
Re: ZXPAND for sale
I am in PA USA. I'm not sure what it is worth, that's why I was asking for offers. I know they are very hard to get ahold of. None on ebay for awhile. I would prefer to sell it in the states just because of the shipping hassle. I also have a collection of other sinclair / timex sinclair stuff you mi...
- Mon Nov 08, 2021 2:22 am
- Forum: SALES
- Topic: ZXPAND for sale
- Replies: 14
- Views: 6841
ZXPAND for sale
ZXPand for sale Will ship to USA or UK only! Any questions please ask. Post your offers below. I know I could probably get more on ebay, but I want to support the members on this forum. Payment via paypal. Thanks, Bean. R.I.P. Sir Clive Sinclair. As a child my family was poor, but my parents bought ...
- Thu Aug 20, 2020 5:03 pm
- Forum: SALES
- Topic: 47 Sinclair / Timex-Sinclair Books for $100
- Replies: 1
- Views: 10056
Re: 47 Sinclair / Timex-Sinclair Books for $100
Sorry, I no longer have these books.
Bean
Bean
- Wed Aug 19, 2020 4:09 pm
- Forum: Development
- Topic: Pretty fast Mandelbrot set generator...
- Replies: 8
- Views: 10458
Re: Pretty fast Mandelbrot set generator...
I think the 0.16 format would be faster, it would just limit what area you could view. But it would let you zoom in further than my 4.12 format. So it might be worth it. I was thinking about possibly changing the existing code so that it runs in fast mode, but shows a couple frames (20 or so) after ...