diff options
Diffstat (limited to 'basics/sprite.s')
| -rw-r--r-- | basics/sprite.s | 28 |
1 files changed, 16 insertions, 12 deletions
diff --git a/basics/sprite.s b/basics/sprite.s index 34f9dba..1fa55ad 100644 --- a/basics/sprite.s +++ b/basics/sprite.s @@ -70,18 +70,20 @@ .addr irq ;;; -;; Required by the default linker configuration. Theoretically there should be a -;; semantical difference between this section and "CODE", but as for the linker -;; goes, there is no difference and everything will be put sequentially on the -;; resulting binary. Hence, if you want (and as I do here), you can leave this -;; empty (so to make the default configuration of the linker happy), and put -;; everything into the "CODE" segment. In fact, according to the Famicom Party -;; Book (https://famicom.party/book/04-hardwareoverview/), the "STARTUP" section -;; is only used by C programs compiled down into 6502 assembly, so it might not -;; be even relevant for us (and in fact said book actually removes this segment -;; in its linker configuration down the road). +;; The "STARTUP" segment is required by the default linker configuration. +;; Theoretically there should be a semantical difference between this section +;; and "CODE", but as for the linker goes, there is no difference and everything +;; will be put sequentially on the resulting binary. Hence, if you want, you can +;; leave this empty (so to make the default configuration of the linker happy), +;; and put everything into the "CODE" segment. In fact, according to the Famicom +;; Party Book (https://famicom.party/book/04-hardwareoverview/), the "STARTUP" +;; section is only used by C programs compiled down into 6502 assembly, so it +;; might not be even relevant for assembly programmers (and in fact said book +;; actually removes this segment in its linker configuration down the road). +;; This is also removed by the configuration provided in `config/nrom.cfg`, +;; which is the one being used in the end for this example. ;;; -.segment "STARTUP" +;; .segment "STARTUP" .segment "CODE" @@ -143,7 +145,9 @@ reset: ;;; ;; NOTE: If you are using a mapper which needs some special configuration, ;; now it would be a good time set it up. I am not using a special mapper, - ;; so there's nothing from me to do here. + ;; so there's nothing from me to do here. Refer to other examples like + ;; `basics/persist.s` on how some chips such as MMC1 are set up at this + ;; point. ;;; ;; At this point, we have to wait for the PPU to stabilize. This is |