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annotate fake_cpm.sz8 @ 2228:0db9dc6a9020

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Some minor refresh emulation improvements
author Michael Pavone <pavone@retrodev.com>
date Mon, 05 Sep 2022 23:37:49 -0700
parents cf6149b7c6e5
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
820
cf6149b7c6e5 Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
1 CONSOLE_PORT equ 0
cf6149b7c6e5 Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
2 STATUS_PORT equ 1
cf6149b7c6e5 Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
3 EXIT_PORT equ 2
cf6149b7c6e5 Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
4 org $E400
cf6149b7c6e5 Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
5 jp handle_call
cf6149b7c6e5 Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
6 ld a, (should_exit)
cf6149b7c6e5 Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
7 dec a
cf6149b7c6e5 Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
8 jr z, do_exit
cf6149b7c6e5 Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
9 ld a, 1
cf6149b7c6e5 Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
10 ld (should_exit), a
cf6149b7c6e5 Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
11 jp $100
cf6149b7c6e5 Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
12 do_exit:
cf6149b7c6e5 Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
13 no_impl
cf6149b7c6e5 Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
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parents:
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14 out (EXIT_PORT), a
cf6149b7c6e5 Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
15 should_exit:
cf6149b7c6e5 Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
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16 dc.b 0
cf6149b7c6e5 Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
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17
cf6149b7c6e5 Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
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18 console_in:
cf6149b7c6e5 Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
19 in a, (CONSOLE_PORT)
cf6149b7c6e5 Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
20 ld l, a
cf6149b7c6e5 Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
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parents:
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21 ret
cf6149b7c6e5 Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
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parents:
diff changeset
22 console_out:
cf6149b7c6e5 Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
23 ld a, e
cf6149b7c6e5 Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
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parents:
diff changeset
24 out (CONSOLE_PORT), a
cf6149b7c6e5 Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
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parents:
diff changeset
25 ret
cf6149b7c6e5 Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
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parents:
diff changeset
26 get_iobyte:
cf6149b7c6e5 Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
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diff changeset
27 ld a, (3)
cf6149b7c6e5 Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
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parents:
diff changeset
28 ld l, a
cf6149b7c6e5 Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
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parents:
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29 ret
cf6149b7c6e5 Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
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parents:
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30 set_iobyte:
cf6149b7c6e5 Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
31 ld a, e
cf6149b7c6e5 Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
32 ld (3), a
cf6149b7c6e5 Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
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parents:
diff changeset
33 ret
cf6149b7c6e5 Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
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34 write_string:
cf6149b7c6e5 Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
35 ld c, '$'
cf6149b7c6e5 Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
36 jp .start
cf6149b7c6e5 Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
37 .continue
cf6149b7c6e5 Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
38 out (CONSOLE_PORT), a
cf6149b7c6e5 Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
39 inc de
cf6149b7c6e5 Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
40 .start
cf6149b7c6e5 Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
41 ld a, (de)
cf6149b7c6e5 Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
42 cp c
cf6149b7c6e5 Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
43 jr nz, .continue
cf6149b7c6e5 Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
44 ;flush output
cf6149b7c6e5 Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
45 out (STATUS_PORT),a
cf6149b7c6e5 Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
46 ret
cf6149b7c6e5 Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
47 read_string:
cf6149b7c6e5 Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
48 ld a, (de)
cf6149b7c6e5 Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
49 ld c, a
cf6149b7c6e5 Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
50 ld b, $A ;newline
cf6149b7c6e5 Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
51 inc c
cf6149b7c6e5 Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
52 inc de
cf6149b7c6e5 Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
53 push de
cf6149b7c6e5 Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
54 inc de
cf6149b7c6e5 Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
55 jp .start
cf6149b7c6e5 Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
56 .continue
cf6149b7c6e5 Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
57 in a, (CONSOLE_PORT)
cf6149b7c6e5 Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
58 cp b
cf6149b7c6e5 Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
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parents:
diff changeset
59 jr z, .end
cf6149b7c6e5 Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
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parents:
diff changeset
60 ld (de), a
cf6149b7c6e5 Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
61 inc de
cf6149b7c6e5 Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
62 .start
cf6149b7c6e5 Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
63 dec c
cf6149b7c6e5 Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
64 jr nz, .continue
cf6149b7c6e5 Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
65 ;todo: consume excess characters
cf6149b7c6e5 Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
66 .end
cf6149b7c6e5 Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
67 pop hl
cf6149b7c6e5 Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
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parents:
diff changeset
68 ex de, hl
cf6149b7c6e5 Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
69 sbc hl, de
cf6149b7c6e5 Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
70 ld a, l
cf6149b7c6e5 Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
71 ld (de), a
cf6149b7c6e5 Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
72 ret
cf6149b7c6e5 Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
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parents:
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73
cf6149b7c6e5 Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
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parents:
diff changeset
74 console_status:
cf6149b7c6e5 Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
75 in a, (STATUS_PORT)
cf6149b7c6e5 Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
76 ld l, a
cf6149b7c6e5 Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
77 ret
cf6149b7c6e5 Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
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parents:
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78
cf6149b7c6e5 Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
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parents:
diff changeset
79 handle_call:
cf6149b7c6e5 Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
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parents:
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80 ld a, c
cf6149b7c6e5 Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
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parents:
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81 or a
cf6149b7c6e5 Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
82 jr z, do_exit
cf6149b7c6e5 Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
83 dec a
cf6149b7c6e5 Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
84 jr z, console_in
cf6149b7c6e5 Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
85 dec a
cf6149b7c6e5 Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
86 jr z, console_out
cf6149b7c6e5 Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
87 dec a
cf6149b7c6e5 Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
88 jr z, no_impl ;aux reader input
cf6149b7c6e5 Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
89 dec a
cf6149b7c6e5 Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
90 jr z, no_impl ;aux punch output
cf6149b7c6e5 Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
91 dec a
cf6149b7c6e5 Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
92 jr z, no_impl ;printer output
cf6149b7c6e5 Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
93 dec a
cf6149b7c6e5 Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
94 jr z, no_impl ;direct console IO
cf6149b7c6e5 Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
95 dec a
cf6149b7c6e5 Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
96 jr z, get_iobyte
cf6149b7c6e5 Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
97 dec a
cf6149b7c6e5 Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
98 jr z, set_iobyte
cf6149b7c6e5 Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
99 dec a
cf6149b7c6e5 Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
100 jr z, write_string
cf6149b7c6e5 Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
101 dec a
cf6149b7c6e5 Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
102 jr z, read_string
cf6149b7c6e5 Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
103 dec a
cf6149b7c6e5 Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
104 jr z, console_status
cf6149b7c6e5 Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
105 jp no_impl