From: Mark Wooding <mdw@distorted.org.uk>
Date: Thu, 18 Nov 2021 19:47:32 +0000 (+0000)
Subject: Add a separate port for 1K ZX81.
X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~mdw/git/zx-fizzbuzz/commitdiff_plain/601d46cd6c5e38d40de9226ea05bd2260e38f1c4

Add a separate port for 1K ZX81.

This puts each output on its own line rather than trying to fill the
screen -- because there isn't enough memory to do that.

Alternatively, we might try writing to just the top few lines of the
display file.  Maybe later.
---

diff --git a/.gitignore b/.gitignore
index aff1ece..fcbd6e3 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
 *.img
 /spectrum-fizzbuzz.tap
+/zx81-1kfizzbuzz.p
 /zx81-fizzbuzz.p
diff --git a/Makefile b/Makefile
index 40594c4..a72a278 100644
--- a/Makefile
+++ b/Makefile
@@ -24,6 +24,14 @@ TARGETS			+= zx81-fizzbuzz.p
 zx81-fizzbuzz.p: gluep zx81-loader.p zx81-fb.img
 	./gluep 0x4009:zx81-loader.p 0x7000:zx81-fb.img >$@.new && mv $@.new $@
 
+CLEANFILES		+= zx81-1kfb.img
+zx81-1kfb.img: zx81-1k.s fizzbuzz.s
+	z80asm -o $@ $^
+
+TARGETS			+= zx81-1kfizzbuzz.p
+zx81-1kfizzbuzz.p: gluep zx81-1kldr.p zx81-1kfb.img
+	./gluep 0x4009:zx81-1kldr.p 0x4300:zx81-1kfb.img >$@.new && mv $@.new $@
+
 all: $(TARGETS)
 
 clean::; rm -f $(CLEANFILES)
diff --git a/zx81-1k.s b/zx81-1k.s
new file mode 100644
index 0000000..74460fd
--- /dev/null
+++ b/zx81-1k.s
@@ -0,0 +1,25 @@
+;;; -*-asm-*-
+
+	org	0x4300
+
+spc:	equ	0x76
+
+fixdig:	macro
+	add	a, 0x1c
+	endm
+
+print_a: macro
+	rst	0x10
+	endm
+
+endstr:	equ	0x7a
+endstrp: macro
+	cp	endstr
+	endm
+
+	jr	begin
+
+fizz:	db	0x2b, 0x2e, 0x3f, 0x3f, endstr
+buzz:	db	0x27, 0x3a, 0x3f, 0x3f, endstr
+
+begin:
diff --git a/zx81-1kldr.p b/zx81-1kldr.p
new file mode 100644
index 0000000..847255b
Binary files /dev/null and b/zx81-1kldr.p differ