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1: ;; settime.z
2: ;;
3: ;; Read date and time from xtrs 1.9 emulator trap and set
4: ;; TRS-80 system date and time.
5: ;;
6: ;; Copyright (c) 1998 Ulrich Mueller
7: ;;
8: ;; This software may be copied, modified, and used for any
9: ;; purpose without fee, provided that (1) the above copyright
10: ;; notice is retained, and (2) modified versions are clearly
11: ;; marked as having been modified, with the modifier's name and
12: ;; the date included.
13: ;;
14: ;; Last modified on Fri May 19 00:38:41 PDT 2000 by mann
15: ;; modified on Sun Feb 22 21:27:13 CET 1998 by ulm
16:
17: ;; Model I/III addresses
18: 402D @exit equ 402dh
19: 4030 @abort equ 4030h
20:
21: ;; Model 1 and 3 store the last 2 digits of the year in the year byte
22: 4041 time1$ equ 4041h ; seconds/minutes/hours
23: 4044 date1$ equ 4044h ; year/day/month
24: 4217 time3$ equ 4217h
25: 421A date3$ equ 421ah
26:
27: ;; Model 4 SVCs
28: 0028 @svc equ 40 ; rst address for SVCs
29: ;@svc equ 5 ; older zmac requires 8080-style "rst 5"
30: 0016 @exit6 equ 22
31: 0015 @abort6 equ 21
32:
33: ;; Model 4 stores the offset from 1900 in the year byte
34: 002D time4$ equ 002dh
35: 0033 date4$ equ 0033h
36:
37: ;; Emulator trap instructions
38: 36ED emt_time equ 36edh
39:
40: 5200 org 5200h
41: 5200 settime:
42: 5200 CDB452 call initj ; init OS-dependent tables
43: 5203 01FFFF ld bc, 0ffffh
44: 5206 3E01 ld a, 1 ; get local time from Unix
45: 5208 ED36 defw emt_time ; BCDE: seconds since 1970
46: 520A 78 ld a, b
47: 520B A1 and c
48: 520C 3C inc a
49: 520D CA9052 jp z, abort
50: 5210 F3 di
51: 5211 2A9352 ld hl, (time)
52: 5214 3E3C ld a, 60
53: 5216 CD7452 call divide
54: 5219 77 ld (hl), a ; seconds
55: 521A 23 inc hl
56: 521B 3E3C ld a, 60
57: 521D CD7452 call divide
58: 5220 77 ld (hl), a ; minutes
59: 5221 23 inc hl
60: 5222 3E18 ld a, 24
61: 5224 CD7452 call divide
62: 5227 77 ld (hl), a ; hours
63: 5228 EB ex de, hl ; HL: days since 1970
64: 5229 014513 ld bc, 19*256+70-1
65: 522C 116D01 ld de, 365
66: 522F 0C year1: inc c ; count years in C
67: 5230 79 ld a, c
68: 5231 D664 sub 100
69: 5233 3803 jr c, year2
70: 5235 4F ld c, a
71: 5236 04 inc b ; centuries
72: 5237 78 ld a, b
73: 5238 E603 year2: and 3
74: 523A D601 sub 1
75: 523C ED52 sbc hl, de
76: 523E 30EF jr nc, year1
77: 5240 07 rlca
78: 5241 ED5A adc hl, de ; HL: days since 1 january
79: 5243 E5 push hl
80: 5244 2A9552 ld hl, (date)
81: 5247 CD9752 call putyr ; year to (hl)
82: 524A 23 inc hl
83: 524B E3 ex (sp), hl
84: 524C E601 and 1 ; A=1 for leap year, 0 else
85: 524E C61C add a, 28
86: 5250 4F ld c, a
87: 5251 0600 ld b, 0
88: 5253 50 ld d, b
89: 5254 04 month1: inc b ; count months in B
90: 5255 78 ld a, b
91: 5256 59 ld e, c
92: 5257 FE02 cp 2
93: 5259 2808 jr z, month2 ; february
94: 525B 1E1F ld e, 31
95: 525D E609 and 9
96: 525F E26352 jp po, month2 ; 31 days
97: 5262 1D dec e ; 30 days
98: 5263 ED52 month2: sbc hl, de ; subtract length of month
99: 5265 30ED jr nc, month1
100: 5267 ED5A adc hl, de
101: 5269 4D ld c, l
102: 526A E1 pop hl
103: 526B 71 ld (hl), c ; day
104: 526C 23 inc hl
105: 526D 70 ld (hl), b ; month
106: 526E FB ei
107: 526F 210000 ld hl,0 ; needed on Model 4 --mann
108: 5272 1819 jr exit
109:
110: ;; divide BCDE / A
111: ;; returns quotient in BCDE, remainder in A
112: 5274 E5 divide: push hl
113: 5275 ED44 neg
114: 5277 67 ld h, a
115: 5278 97 sub a
116: 5279 2E21 ld l, 33
117: 527B 17 div1: rla
118: 527C 84 add a, h
119: 527D 3801 jr c, div2
120: 527F 94 sub h
121: 5280 CB13 div2: rl e
122: 5282 CB12 rl d
123: 5284 CB11 rl c
124: 5286 CB10 rl b
125: 5288 2D dec l
126: 5289 20F0 jr nz, div1
127: 528B E1 pop hl
128: 528C C9 ret
129:
130: ;; Jump tables for OS independence
131: ;; Model 1
132: 528D startj:
133: 528D C32D40 exit: jp @exit
134: 5290 C33040 abort: jp @abort
135: 5293 4140 time: defw time1$
136: 5295 4440 date: defw date1$
137: 5297 C3D052 putyr: jp putyr1
138: 529A endj:
139:
140: ;; Model 3
141: 529A startj3:
142: 529A C32D40 jp @exit
143: 529D C33040 jp @abort
144: 52A0 1742 defw time3$
145: 52A2 1A42 defw date3$
146: 52A4 C3D052 jp putyr3
147:
148: ;; Model 4
149: 52A7 startj4:
150: 52A7 3E16 ld a, @exit6
151: 52A9 EF rst @svc
152: 52AA 3E15 ld a, @abort6
153: 52AC EF rst @svc
154: 52AD 2D00 defw time4$
155: 52AF 3300 defw date4$
156: 52B1 C3D252 jp putyr4
157:
158: ;; Initialize tables
159: ;; Changed to work even on a Model III (or Model 4 in III mode)
160: ;; using MODELA/III as its ROM. Previous version didn't. --mann
161: ;;
162: 52B4 21A752 initj: ld hl, startj4 ; model 4?
163: 52B7 3A0A00 ld a, (000ah)
164: 52BA FE40 cp 40h
165: 52BC 2009 jr nz, movej ; go if so
166: 52BE 219A52 ld hl, startj3 ; model 3?
167: 52C1 3A2501 ld a, (0125h)
168: 52C4 FE49 cp 'I'
169: 52C6 C0 ret nz ; return if not
170: 52C7 118D52 movej: ld de, startj
171: 52CA 010D00 ld bc, endj - startj
172: 52CD EDB0 ldir
173: 52CF C9 ret
174:
175: ;; Create year byte.
176: ;; On entry, c has 2-digit year, b has century.
177: ;; On exit, (hl) has year byte.
178:
179: ;; Model I/III, put 2-digit year
180: 52D0 putyr1:
181: 52D0 71 putyr3: ld (hl), c
182: 52D1 C9 ret
183:
184: ;; Model 4, put offset from 1900 (laboriously recomputed, sigh)
185: 52D2 F5 putyr4: push af
186: 52D3 C5 push bc
187: 52D4 78 ld a, b
188: 52D5 D613 sub 19
189: 52D7 47 ld b, a
190: 52D8 79 ld a, c
191: 52D9 2804 jr z, py41
192: 52DB C664 py40: add a, 100
193: 52DD 10FC djnz py40
194: 52DF 77 py41: ld (hl), a
195: 52E0 C1 pop bc
196: 52E1 F1 pop af
197: 52E2 C9 ret
198:
199: 5200 end settime
Statistics:
36 symbols
227 bytes
Symbol Table:
@abort =4030 emt_time =36ed settime 5200
@abort6 = 15 endj 529a startj 528d
@exit =402d exit 528d startj3 529a
@exit6 = 16 initj 52b4 startj4 52a7
@svc = 28 month1 5254 time 5293
abort 5290 month2 5263 time1 =4041
date 5295 movej 52c7 time3 =4217
date1 =4044 putyr 5297 time4 = 2d
date3 =421a putyr1 52d0 year1 522f
date4 = 33 putyr3 52d0 year2 5238
div1 527b putyr4 52d2
div2 5280 py40 52db
divide 5274 py41 52df
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