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acia: make zasm-friendly

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This commit is contained in:
Virgil Dupras 2019-05-17 08:33:22 -04:00
parent 45b8e84e2a
commit e4ffe669a1
1 changed files with 5 additions and 5 deletions
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10
parts/z80/acia.asm
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@ -16,21 +16,21 @@
; *** CONSTS *** ; *** CONSTS ***
; size of the input buffer. If our input goes over this size, we start losing ; size of the input buffer. If our input goes over this size, we start losing
; data. ; data.
ACIA_BUFSIZE .equ 0x20 .equ ACIA_BUFSIZE 0x20
; *** VARIABLES *** ; *** VARIABLES ***
; Our input buffer starts there. This is a circular buffer. ; Our input buffer starts there. This is a circular buffer.
ACIA_BUF .equ ACIA_RAMSTART .equ ACIA_BUF ACIA_RAMSTART
; The "read" index of the circular buffer. It points to where the next char ; The "read" index of the circular buffer. It points to where the next char
; should be read. If rd == wr, the buffer is empty. Not touched by the ; should be read. If rd == wr, the buffer is empty. Not touched by the
; interrupt. ; interrupt.
ACIA_BUFRDIDX .equ ACIA_BUF+ACIA_BUFSIZE .equ ACIA_BUFRDIDX ACIA_BUF+ACIA_BUFSIZE
; The "write" index of the circular buffer. Points to where the next char ; The "write" index of the circular buffer. Points to where the next char
; should be written. Should only be touched by the interrupt. if wr == rd-1, ; should be written. Should only be touched by the interrupt. if wr == rd-1,
; the interrupt will *not* write in the buffer until some space has been freed. ; the interrupt will *not* write in the buffer until some space has been freed.
ACIA_BUFWRIDX .equ ACIA_BUFRDIDX+1 .equ ACIA_BUFWRIDX ACIA_BUFRDIDX+1
ACIA_RAMEND .equ ACIA_BUFWRIDX+1 .equ ACIA_RAMEND ACIA_BUFWRIDX+1
aciaInit: aciaInit:
; initialize variables ; initialize variables