Hey, I'm working on a new game, but my BASIC listing is over 16K...
Is there a way to make a .rom file using X-Basic that is larger than 32k?
When I try the same old method of hex editing the basic rom and my larger basic listing together and padding it out to 64K, it doesn't seem to run.
If the BASIC program exceeds 16kB, use a ROM mapper and put the half of the BASIC-Kun to another segment of the ROM and a program at 6000h to place the portion that exceeds at C000h in the RAM. Once this part has been copied to RAM, you will just have to put back the BASIC-Kun segment and go back to initialization (restore the main Z80 registers before).
Umm... that sounds easy and straightforward at first glance, but I don't understand why there are 17 bytes of data on each line of your provided example instead of 16.
Umm... that sounds easy and straightforward at first glance, but I don't understand why there are 17 bytes of data on each line of your provided example instead of 16.
push hl
push de
push bc
ld hl,04040h
ld de,0C000h
ld bc,0XXXXh ; Program BASIC lenght that exceeds
ldir
pop bc
pop de
pop hl
ret
but if you use the Basic-Kun, you have to move this program to another address and execute it with INIT address (at 4002h) that is free. So use a ROM mapper because there is no place in the BASIC-Kun ROM.
10 DEFINT A-Z
20 TIME=0
30 FOR I=1 TO 100
40 FOR J=1 TO 100
50 FOR K=1 TO 100
60 L=I+J+K
70 NEXT K
80 NEXT J
90 NEXT I
100 PRINT TIME
I used notepad++ as editor, text saved as plain text, windows line endings. I don't know how MSXBAS2ROM handles different character encodings and line endings.
Compile with:
MSXBAS2ROM.EXE TEST.TXT -C
I tested the resulting ROM in Bluemsx (emulating MSX2), it takes about 5051 frames to complete. I also tried with XBASIC, then it takes 3197 frames to finish the program.
