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Interface Board - 0670-00-0385
Decoder
U8, a EP600 EPLD, is used to generate all the decoding for the peripherals on the in-
terface board. Processor address bits AB2,3,4,12, and 15, BRD*, BWR*, and the
group decoding signal, EXT*, are the inputs. Outputs are the strobes to the LED and
LCD controller, the status and conirol registers, the keyboard register, the recorder
registers, the tone register, the quad DAC, the ROM cartridge (Datasette), and the
video RAM.
60600
INPUTS
вак— | 1
apis lh
Name
Pin
AB4 一 一 |3
BCLK O
;astive high, register clock
Bwf 一 - | 4
AB15
2
¡active high, BDC196 processor address bit 15
BAD*-—+ 5
ABA
3
sactive high, 200186 processor address bit 4
ET
5
MR
4
iactive low, 80C 196 processor write signal
ROM e) 7
BRD*
5
sactive low, 800198 processor read signal
DAC"
a
Er
6
jactive low, group decode for peripherals
TONE*<—| s
AB2
11
zactive high, 800196 processor address bit 2
VRAM*+ 10
ABS
14
jactive high, 80C186 processor address bit 3
AB3 一 一 | 11
ama
23
jactive high, 800156 processor address bit 12
GND—-| 12
ROM
7
jective high, Datasetie enable
Dac
a
¡activa high, quad-DAC enable
TONE
8
¡activa low, tono genaralor anable
VRAM*
10
¿active low, vídeo HAM anabia
LEDO"
15
sactive low, LED group O enable
LEDI*
16
¡active low, LED group 1 enable
Len:
v
sarlive low, LOD enable
KBRD*
18
jactive low, keyboard read enable
SW
13
¡active low, contro! reglster write enable
STRD*
20
jactivalow, status register read enable
RECM»
21
sactive low, recarder motor enable
RECH*
22
¡active low, tecordar head enable
FIGURE 1-1
U8 Interface Board:
PERDEC:
Peripheral Decoder
LED Controller
U1 and U2 are two 7218 LED controllers, each capable of controlling eight seven seg-
..
Ment LED's. Ui controls group A, which includes the three digit systolic and three
„ digit mean/Sa02 LED's. U2 controls group B, which includes the three digit diastolic
and three digit rate LED's. The outputs of U1 and U2 are connected to J18, which
goes to the LED's on the LED board directly.
Group À
. Digit 8 - Systolic Hundreds
Group B
Digit 8 - Diastolic Hundreds
Digit 7 - Systolic Tens
Digit 7 - Diastolic Tens
Digit 6 - Systolic Digits
Digit 6 - Diastolic Digits
Digit 5 - Mean/SaO2 Hundreds
Digit 5 - Rate Hundreds
Digit 4 - Mean/Sa02 Tens
Digit 4 - Rate Tens
Digit 3 - Mean/Sa02 Digits
Digit 3 - Rate Digits
1-40
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