SpritesMind.Net

Although I have real difficulties seeing my code running on the 32X (debugger, anyone ?), I have a silly idea in the head : a rendering library, let's call it GLide, for the 32X. link : http://www.alasir.com/software/glide/index.html The 68k would put data on the Comm Port, and each SH2 would poll i...

The Hardware Manual states that, once it (ADEN bit) has been set, further "change (is) not allowed".

I thought they were quite the same. Can't I do the same things ? Let's suppose I want to draw a 165 pixels long red line, from pixel 48, the others being black. With RLE : 2F00h, A401h, 6A00h with palette : 00h : 0000h black 02h : 7C00h red With FILL : 002Fh, 2000h, 0000h 00A4h, start address is alr...

I was wondering what that FILL function was for ! I didn't see the use since the Run-Length is fine for continous pixels (if less than 255). FILL for clear, why not. The doc states the FILL execution time is 7+3xlength, and the SH2 to DRAM execution time is 1-3 cycles. Is the FILL faster than direct...

Just a little question. The 32X has 2 frame buffer : FB0 and FB1. When FB0 is displayed, I can write to FB1. Calling the frame buffer swap, FB1 is displayed and I can write to FB0. But is this frame buffer emptied or does it still have previous data ? eg : FS = 0 I draw a red triangle. FS = 1 I draw...

Hi you all. Still on 32x dev' ;) I'm looking at the FIFO. First of all, is it usable ? Or is it DREQ only ? The 68k writes to A1 5112h, and the SH2s read 2000 4012h. But is it a stack, a heap or anything ? And if so, how big is it ? I mean, if the 68k want to put several datas, does it have to wait ...

For sure ! And by the way, use private RAM if the data is less than 2KB . Enable 2-way cache (and thus, 2KB of private RAM) : mov CCR,r0 mov #$19,r1 mov r1,@r0 ; Enable Cache, set 2-way, and purge CCR: dc.l $FFFFFE92 Then, private RAM is from C000 0000h to C000 07FFh. I don't know how fast the cache...

As said before (mask of destiny), the SH2 doesn't have any mechanism for cache coherency. When a CPU writes to memory, the other CPU has no mean of knowing the data he might have in its cache has to be invalidated. I've thought about a mechanism : each time a CPU write to memory, it puts the address...

Stef wrote:... you have to use the cache and register as much you can.

Got it !

But man, ... I've never thought of developping software tile distortion .... I miss the Saturn VDP 1 (sigh...)

Anyway, coding a fill polygon function is quite of a challenge, and stimulating enough !!!

I've been thinking of what you told me for an hour, and I conclude that you're absolutely right : any mean that makes memory access or rate go faster will be welcome !

Great piece of advice, Fonz'

the main problem with 32x is the DRAM / VRAM speed... Are you sure the SDRAM speed, or FB speed is the main problem ? I would have guessed some missings features were much more a concern : no fill polygon, no scroll no scaling/rotation/distortion ... no hardware graphics function. Anyway, there are...

Not change, but set. The 7604 Hardware Manual states in £7.5.8 (Power-On Sequence) that CAS latency must be set before any CS0 access. So you've got to write something (any data) to register : - FFFF 8426h for CAS latency 1, 16 bits - FFFF 8446h for CAS latency 2, 16 bits - FFFF 8466h for CAS latenc...

Here's a disassembly of the Master SH2 BIOS : org $0 * VBR dc.l reset ; 0: POWER ON RESET PC dc.l 0x06040000 ; 1: POWER ON RESER SP dc.l reset ; 2: MANUAL RESET PC dc.l 0x06040000 ; 3: MANUAL RESET SP dc.l forever ; 4: GENERAL ILLEGAL INSTRUCTION dc.l 0x00000000 ; 5: SEGA RESERVED dc.l forever ; 6: ...

Did you manage to run both SH code actualy? Not today ! My boss won't be happy since I've done ... nothing this week !!! Once more !!! But, I've understood everything I wanted ! I get the boot process ! Next step will be to write something in Frame Buffer from just one SH2. Next step will be to plo...

I've found out that the Master SH2 bios checks the initial program of the cartridge. So, it has to be present in rom, and it is present !!! From $36C to $76C !!!