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Length: 20736 (0x5100)
Types: RcTekst
Names: »99110056.WP«
└─⟦7fab0c8ae⟧ Bits:30005866/disk3.imd Dokumenter i RcTekst format (RCSL 99-1-*)
└─⟦this⟧ »99110056.WP«
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┆14┆┆b3┆┆06┆┆06┆┆0b┆↲
┆a1┆┆b0┆↲
┆b0┆┆a1┆1. INTRODUCTION↲
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┆84┆This manual describes the RC3902 computer.↲
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┆84┆┆84┆The computer contains:↲
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1. A central processer CPU6XX.↲
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2. A memory board or MEM6XX.↲
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3. An intelligent terminal controller board ITC602.↲
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4. A SCSI host adaptor MSA690.↲
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5. A SCSI disk controller SDC691↲
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6. A winchester disk drive WDD6XX↲
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7. A floppy disk drive FDD601↲
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8. A SCSI termination unit STU601↲
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9. A backplane BPL606.↲
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10. A display section LED603.↲
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11. A power section.↲
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┆84┆This manual does not contain a full description of the ↓
┆19┆┆89┆┄┄elements of the RC3902 computer. (For further information of ↓
┆19┆┆89┆┄┄the elements see the reference list in appendix A).↲
════════════════════════════════════════════════════════════════════════
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┆a1┆┆b0┆2. GENERAL DESCRIPTION OF RC3902↲
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┆84┆The RC3902 MICROCOMPUTER SYSTEM from RC computer is a high ↓
┆19┆┆89┆┄┄performance multiuser system, which gives you the performance ↓
┆19┆┆89┆┄┄of a 16 bit microprocessor iAPX286 with memory mangement on ↓
┆19┆┆89┆┄┄chip. This manual describes the hardware of the RC3902 ↓
┆19┆┆89┆┄┄computer. The hardware is MULTIBUS* compatible.↲
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Fig 2.1 The RC3902 in front view.↲
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* MULTIBUS is a trademark of INTEL.↓
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┆a1┆┆b0┆3. BLOCK DIAGRAM↲
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┆b0┆┆a1┆┆81┆3.1 CPU6XX, CPU board.↲
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┆84┆In this part, and in the rest of the chapter, it will be shown ↓
┆19┆┆89┆┄┄how to set jumpers on the multibus boards. RC3902 computer ↓
┆19┆┆89┆┄┄includes one of three CPU boards CPU610A, CPU610B or CPU691. ↓
┆19┆┆89┆┄┄CPU610 is from RC Computer and contains one jumper in position ↓
┆19┆┆89┆┄┄W11. CPU691 is a CPU board from INTEL and includes some jumpers ↓
┆19┆┆89┆┄┄and modification. Part 3.1 shows the jumper configuration and ↓
┆19┆┆89┆┄┄modification of CPU691, further it includes a list of the ↓
┆19┆┆89┆┄┄cables to the CPU's. Fig 3.1.1 shows the location of the ↓
┆19┆┆89┆┄┄jumpers on the CPU691 CPU board. Table 3.1.1-3.1.2 list the ↓
┆19┆┆89┆┄┄standard jumper configuration and the RC computers jumper ↓
┆19┆┆89┆┄┄modifications. Fig 3.1.2 indicates the extra modification. ↓
┆19┆┆89┆┄┄Further the signal at the connectors will be described.↲
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Fig 3.1.1 ┆84┆Jumpers location on the CPU691 CPU board.↲
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┆84┆Table 3.1.1 ┆84┆Factories jumper configuration on the CPU691.↲
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┆a1┆ Removed jumpers New jumpers ↲
! ! !↲
! 90 - 91 ! 112 - 145 !↲
! 122 - 147 ! 122 - 127 !↲
! 126 - 141 ! 154 - 160 !↲
! 155 - 156 ! 227 - 228 !↲
! 157 - 158 ! !↲
! 159 - 160 ! !↲
! 222 - 223 ! !↲
! 224 - 225 ! !↲
! 226 - 227 ! !↲
! 231 - 232 ! !↲
! 271 - 272 ! !↲
┆a1┆! ! !↲
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Table 3.1.2 ┆84┆Differences from the factorys standard jumper ↓
┆19┆┆95┆┄┄configuration on CPU691.↲
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1. Disconnect U4-6↲
2. Connect U1-5 to U1-7↲
3. Connect U4-6 to E132↲
4. Connect E123 to E128↲
5. Connect U20-14 to J4-6 with a 330 resistance↲
6. Connect U19-14 to J4-12 with a 330 resistance↲
7. Connect E147 to U27-23↲
8. Connect E141 to U27-24↲
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Fig 3.1.2 ┆84┆Modification on the CPU691 CPU board.↲
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┆84┆ In Pos U75 an EPROM ROD41 (ODD) is mounted.↲
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In Pos U40 an EPROM ROD40 (EVEN) is mounted.↲
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┆84┆Table 3.1.3 ┆84┆Signals at the J3 V24 consol connector.↲
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┆84┆Table 3.1.4 ┆84┆Signals at the J4 LED603 connector.↲
┆8c┆┆83┆┆c8┆↓
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┆84┆Table 3.1.5 ┆84┆Signals at the J1 printer connector.↲
════════════════════════════════════════════════════════════════════════
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┆b0┆┆a1┆┆b0┆┆a1┆3.2 MEM6XX Memory board↲
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┆84┆Fig 3.2.1 shows the location of the jumpers on the MEM691 ↓
┆19┆┆89┆┄┄memory board.↲
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Fig 3.2.1 ┆84┆The location of the jumpers on the MEM691 Memory ↓
┆19┆┆93┆┄┄board.↲
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┆84┆Differences from the factory standard jumpers configuration:↲
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┆a1┆ Removed jumpers New jumpers ↲
! ! !↲
! 125 - 135 ! 130 - 140 !↲
! ! 122 - 140 !↲
┆a1┆! ! !↲
════════════════════════════════════════════════════════════════════════
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┆b0┆┆a1┆3.3 ITC602 Intelligent terminal controller↲
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┆84┆Fig 3.3.1 shows the location of the jumpers on the ITC602 ↓
┆19┆┆89┆┄┄Intelligent terminal controller board. Further it includes a ↓
┆19┆┆89┆┄┄description of the on-board connectors.↲
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Fig 3.3.1 Location of the jumpers on the ITC602 board.↲
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════════════════════════════════════════════════════════════════════════
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┆84┆The RC standard jumper configuration:↲
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ST1┆06┆: 7 - 10↲
ST2┆06┆: 3 - 9↲
ST3┆06┆: No jumper.↲
ST4┆06┆: 1 - 4↲
ST5┆06┆: No jumper.↲
ST6 : 1 - 16↲
ST6 : 4 - 13↲
ST6┆06┆: 5 - 12↲
ST6 : 6 - 11↲
ST6┆06┆: 7 - 10↲
ST7┆06┆: 1 - 4↲
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Table 3.3.1 Standard jumper configuration from RC Computer.↲
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In Pos U3 an EPROM ROC375 (ODD) is mounted.↲
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In Pos U4 an EROM ROC374 (EVEN) is mounted.↲
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In Pos U109 an EPROM ROC474 is mounted.↲
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════════════════════════════════════════════════════════════════════════
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┆b0┆┆a1┆3┆b0┆┆a1┆.4 The disk part of the computer.↲
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┆84┆This part describes the disk section, of the 3902 computer. ↓
┆19┆┆89┆┄┄The SCSI interface is used to connect the disks with the ↓
┆19┆┆89┆┄┄multibus. The block diagram in fig 3.4.1 shows the standard ↓
┆19┆┆89┆┄┄disk system of the computer.↲
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┆84┆┆84┆The disk section contains:↲
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1. A multibus to SCSI host adapter.↲
2. A SCSI disk controller SDC691.↲
3. A Winchester disk drive WDD60X.↲
4. A Flexible disk drive FDD601.↲
5. A SCSI termination unit STU601↲
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Fig 3.4.1 Block diagram of the disk section.↲
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┆84┆This manual does not contain a full description of the five ↓
┆19┆┆89┆┄┄elements of the disk section. (For further information of the ↓
┆19┆┆89┆┄┄elements see the reference list in appendix A).↲
↲
┆a1┆┆b0┆┆b0┆┆a1┆↲
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┆a1┆┆b0┆3.4.1 Multibus to SCSI host adapter board.↲
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┆84┆Fig 3.4.1.1 shows the location of the jumpers on the MSA690 ↓
┆19┆┆89┆┄┄SCSI host adaptor board.↲
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Fig 3.4.1.1 location of jumpers on the MSA690.↲
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┆84┆Differences from the factories standard jumper configuration on ↓
┆19┆┆89┆┄┄MSA690:↲
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┆a1┆ Removed jumpers New jumpers ↲
! ! !↲
┆07┆ ! !┆07┆ 4R5 - 4R12 !↲
!┆07┆ ┆07┆┆07┆ ! 5M - 5L !↲
┆a1┆! ! !↲
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Table 3.4.1.1 Jumper modification of the MSA690 board.↲
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════════════════════════════════════════════════════════════════════════
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┆06┆Switch settings↲
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┆06┆┆a1┆Pos 4P↲
┆06┆1 closed↲
┆06┆2 closed↲
┆06┆3 open↲
┆06┆4 open↲
┆06┆5 open↲
┆06┆6 open↲
┆06┆7 open↲
┆06┆8 open↲
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┆06┆┆a1┆Pos 4Q↲
┆06┆1 open↲
┆06┆2 open↲
┆06┆3 open↲
┆06┆4 open↲
┆06┆5 open↲
┆06┆6 open↲
┆06┆7 open↲
┆06┆8 open↲
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┆84┆Table 3.4.1.3 ┆84┆Signals at the J3 SCSI connector.↲
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┆a1┆┆b0┆3.4.2 SCSI disk controller SDC691.↲
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┆84┆ ┆84┆The disk section includes a disk controller board SDC 691. The ↓
┆19┆┆89┆┄┄board makes the connection between the SCSI bus and the disks.↲
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Fig 3.4.2.1 ┆84┆Location of the jumpers on the SDC691 board.↲
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┆84┆Differences from the factories standard jumper configuration on ↓
┆19┆┆89┆┄┄SDC691:↲
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┆a1┆ Removed jumpers New jumpers ↲
! ! !↲
┆07┆ ! W15 1 - 2 !┆07┆ W4 1 - 2 !↲
!┆07┆ ┆07┆┆07┆ ! W8 1 - 2 !↲
┆a1┆! ! !↲
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Table 3.4.2.1 Jumper modification of the SDC691 board.↲
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════════════════════════════════════════════════════════════════════════
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┆a1┆┆b0┆3.4.3 Winchester disk drive WDD60X↲
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┆a1┆┆b0┆┆f0┆┆e1┆ ┆84┆The computer includes non-removable 5.25 inch winchester disk ↓
┆19┆┆89┆┆81┆┄drive from Vertex (1XX). It has ST506 interface and the ↓
┆19┆┆89┆┆81┆┄specifications below.↲
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Fig 3.4.3.1 Back view of the winchester WDD60X↲
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36 Shunt block disconnections↲
5 - 12↲
6 - 11↲
7 - 10↲
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Table 3.4.3.1 Shunt modifications on Winchester disk WDD60X↲
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════════════════════════════════════════════════════════════════════════
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Functional Specifications :↲
┆a1┆┆b0┆↲
┆a1┆┆e1┆ ┆84┆┆84┆┆a1┆Winchester disk drive ┆a1┆WDD604 WDD605↲
╞ ↲
Unformatted capacity (Mbytes)┆07┆ 51.4 85.0↲
Formatted capacity (Mbytes)* 45.48 75.22↲
Number of disks per drive┆07┆ 3 4↲
Number of data surfaces ┆07┆ 5 7↲
Bytes/track (Unformatted) 10,416 10,416↲
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Average latency time (ms) 8.33 8.33↲
Average seek time (ms)┆07┆(max) 30 30↲
Maximum seek time (ms) (max)┆07┆ 65 65↲
Data transfer rate (Mbits/sec)┆07┆ 5 5↲
-"- (kbytes/sec) ┆07┆ 625 625↲
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Rotational speed (r/min)┆07┆┆07┆ 3600 3600↲
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MTBF (hours)┆07┆┆07┆┆07┆ 11,000 11,000↲
-------------------------------------------------------↲
┆a1┆┆e1┆↲
Table 3.4.3.2 ┆84┆Specification of the winchester drives WDD60X. ↓
┆19┆┆97┆┄┄*Formatted with 1024 bytes/sector. ↲
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┆84┆Table 3.4.3.3 ┆84┆Signals at the J1 command connector.↲
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┆84┆Table 3.4.3.4 ┆84┆Signals at the J2 data connector.↲
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┆a1┆┆b0┆3.4.4 Floppy disk drive FDD601.↲
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┆84┆The RC3902 includes a 5.25 inch 1.6 Mbutes floppy drive. This ↓
┆19┆┆89┆┄┄part describes the floppy disk drive specification and ↓
┆19┆┆89┆┄┄connectors.↲
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Fig 3.4.4.1 Drawing of the floppy disk drive FDD601.↲
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Table 3.4.4.1 Jumpers on FDD601↲
(Jumper SF 1-2 is disconnected)↲
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┆84┆┆84┆┆a1┆Flexible disk drive FDD601: ┆a1┆ ↲
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Unformatted capacity (bytes)┆07┆ 1.642.496↲
-"-╞ (Mbytes)╞ 1.57↲
Formatted capacity (bytes)* 1.261.568↲
-"-╞ (Mbytes)*╞ 1.2↲
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Tracks/surface┆07┆┆07┆ 77↲
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Average latency (ms)┆07┆ 83↲
Average seek time (ms)┆07┆(max)┆07┆ 91↲
Data transfer rate (Mbits/sec)┆07┆ 0.5↲
-"- (kbytes/sec)┆07┆ 61↲
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Rotational speed (r/min)┆07┆┆07┆ 360↲
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MTBF (hours)┆07┆┆07┆┆07┆ 8.000↲
--------------------------------------------↲
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Table 3.4.4.2 ┆84┆Specification of the floppy disk drive FDD601. ↓
┆19┆┆97┆┄┄*Formatted with 512 bytes/sector. ↲
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┆84┆Table 3.4.4.3 ┆84┆Connections to floppy disk FDD601 driv.↲
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┆a1┆┆b0┆3.4.5 SCSI termination unit STU601.↲
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┆84┆┆84┆The computer includes a SCSI termination printed board STU601. ↓
┆19┆┆89┆┄┄The board makes it possible to connect an external device to ↓
┆19┆┆89┆┄┄the internal SCSI bus.↲
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Fig 3.4.5.1 SCST termination unit STU601.↲
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┆b0┆┆a1┆3.5 BPL606 Backplane ↲
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┆84┆The backplane BPL606 connects up to sixteen MULTIBUS cards. It ↓
┆19┆┆89┆┄┄includes two iLBX busses, one with four slots and one with ↓
┆19┆┆89┆┄┄five. The Backplane distributes power (5v,12v,-12v) to the ↓
┆19┆┆89┆┄┄MULTIBUS cards. (The -12v is regulated on the backplane). ↓
┆19┆┆89┆┄┄Further it includes a reset circuit and multibus arbitration ↓
┆19┆┆89┆┄┄logic with parallel priority.↲
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Fig 3.5.1 The backplane BPL606.↲
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┆84┆Table 3.5.2 ┆84┆Signals at the JX multibus connector.↲
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┆84┆Table 3.5.3 ┆84┆Signals at the JXA iLBX connector.↲
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┆b0┆┆a1┆3.6 LED603 Light emitting diodes ↲
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┆84┆At the front panel eight light emiting diodes are mounted. ↓
┆19┆┆89┆┄┄They show, selftest on, disk access and access on circuit 2. ↓
┆19┆┆89┆┄┄(See fig 3.6.1). (The LAN light emmiting diode and the four ↓
┆19┆┆89┆┄┄diodes below are not connected in the standard configuration).↲
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Fig 3.6.1 ┆84┆Light emmiting diodes at the front panel of the ↓
┆19┆┆93┆┄┄RC3902.↲
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┆84┆↲
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Fig 3.6.2 LED603 printed board.↲
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Fig 3.6.3 Diagram of LED603.↲
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┆b0┆┆a1┆4. EXTERNAL CONNECTIONS↲
↲
┆84┆The section describes the external connections. (See fig 4.1.). ↓
┆19┆┆89┆┄┄J31 - J34 are the four V24 connectors to the ITC602. J51 is a ↓
┆19┆┆89┆┄┄connection to the circuit 2. (J52 and J53 is used in options. ↓
┆19┆┆89┆┄┄J41 is the consol conector to CPU6XX. J42 is the printer ↓
┆19┆┆89┆┄┄connection to the cpu691. J71 is used to connect an external ↓
┆19┆┆89┆┄┄SCSI unit to the internal SCSI bus. ↲
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Fig 4.1 ┆84┆Connectors at backpanel of RC3902. For further ↓
┆19┆┆92┆┄┄informations, see table 4.1).↲
↲
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↲
┆a1┆ ┆84┆Name External device Plug type External cable ↲
↲
J31-J34 Terminals 25 pol d sub F KBL561, V24.↲
J41 Consol 25 pol d sub F KBL561, V24.↲
J42 Printer 25 pol d sub F KBL599,Centronics.↲
J51 Circuit 2 5 pol DIN M KBL604.↲
J71 SCSI unit 37 pol DIN F KBL617.↲
--------------------------------------------------------↲
↲
Table 4.1 ┆84┆External connections to RC3902. F : Female and ↓
┆19┆┆93┆┄┄M : Male.↲
↲
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┆b0┆┆a1┆5. INTERNAL CONNECTIONS↲
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┆84┆The section describes the internal connections. (See fig 5.1.).↲
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┆84┆Fig 5.1 ┆84┆Inside the RC3902 computer. the ETC and COM board are ↓
┆19┆┆92┆┄┄options.↲
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┆a1┆Name Board Plug type at board Internal cable. ↲
↲
JX CPU6XX 26 pol Card F KBL6XX,Centronics.↲
JX CPU6XX 26 pol Card F KBL6XX, V24.↲
J4 CPU691 14 pol Mini Latch KBL6XX,LED603.↲
J1/J2 ITC602 20 pol Mini Latch KBL686, V24.↲
J3 ITC602 10 pol Mini Latch KBL687, circuit 2.↲
J3 MSA690 50 pol Flat F KBL688, STU601↲
J1 SDC691 50 pol Flat F - " -↲
J2 SDC691 34 pol Flat F KBL689, WDD60X. Com.↲
J3 SDC691 20 pol Flat F KBL691, WDD60X. Data.↲
J7 SDC691 34 pol Flat F KBL692, FDD601.↲
----------------------------------------------------------↲
↲
Table 5.1 ┆84┆Internal connections in RC3902. F : Female and ↓
┆19┆┆93┆┄┄M : Male.↲
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┆b0┆┆a1┆6. MULTIBUS USAGE↲
┆a1┆┆b0┆↲
┆b0┆┆a1┆6.1 Place in card cage.↲
┆a1┆┆b0┆↲
┆84┆Figur 3.5.1 (In part 3.5) shows the configuration of ↓
┆19┆┆89┆┄┄the backplane BPL606. (For further information of system RC39 ↓
┆19┆┆89┆┄┄configuration see ref. 12).↲
↲
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┆a1┆┆b0┆┆a1┆┆b0┆┆b0┆┆a1┆6.2 Memory Map.↲
┆b0┆┆a1┆↲
┆84┆The memory map shows the address space seen from the Intel's ↓
┆19┆┆89┆┄┄multibus. It is asumed that the processor is in protected ↓
┆19┆┆89┆┄┄virtual address mode (PVAM).↲
↲
┆a1┆┆e1┆ ┆a1┆Address ┆84┆ Memory unit Size (Kbytes)↲
FFFFFFH EPROM┆07┆at the 16↲
FFC000H CPU Board↲
-------------------------------------------↲
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-------------------------------------------↲
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9EFFFFH ITC602 ┆07┆64↲
9E0000H Board↲
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-------------------------------------------↲
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080000H RAM ┆07┆512↲
000000H Board↲
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-------------------------------------------↲
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┆84┆Table 6.2.1 ┆84┆Memory map of the multibus in the standard ↓
┆19┆┆95┆┄┄congfiguration. Please note that all other ↓
┆19┆┆95┆┄┄addresses are reserved.↲
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┆a1┆┆b0┆6.3 Multibus interrupts and I/O map.↲
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┆84┆This section contains information of how to use the multibus ↓
┆19┆┆89┆┄┄interrupt lines. It also shows the I/O map.↲
┆a1┆┆e1┆↲
┆a1┆Interrupt line Multibus board↲
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/ INT0 MEM6XX↲
/ INT1 reserved↲
/ INT2 -"-↲
/ INT3 -"-↲
/ INT4 MSA690↲
/ INT5 ITC602↲
/ INT6 reserved↲
/ INT7 -"-↲
↲
------------------------------------↲
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I/O Map :↲
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┆a1┆┆e1┆ ┆a1┆I/O addres Unit ↲
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01C0H MEM6XX↲
0200H ITC602↲
0300H MSA690↲
----------------------------------------------↲
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┆84┆Table 6.3.1 ┆84┆I/O map of the multibus in the standard ↓
┆19┆┆95┆┄┄congfiguration. Please note that all other ↓
┆19┆┆95┆┄┄addresses are reserved.↲
↲
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┆b0┆┆a1┆7. SELFTEST↲
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┆84┆The 3902 carries out a selftest under power up. The CPU6XX is ↓
┆19┆┆89┆┄┄a test master. It tests the multibus and it self. The other ↓
┆19┆┆89┆┄┄multibus boards make their own selftests. A detailled ↓
┆19┆┆89┆┄┄desciption of these test- procedures is included in litt. 9,10 ↓
┆19┆┆89┆┄┄and 11.↲
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┆b0┆┆a1┆8. SPECIFICATIONS↲
┆a1┆┆b0┆↲
┆a1┆┆b0┆┆a1┆┆b0┆8.1 Environmental Specifications↲
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Ambient Temperature: 5 - 33┆81┆o ┆82┆C.↲
Relative Humidity: 20 - 80%. (No condensation)↲
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┆a1┆┆b0┆8.2 Physical Specifications↲
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Height 630mm↲
┆07┆┆07┆Width┆07┆ 310mm↲
Depth 642mm↲
Weight 40kg↲
↲
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┆a1┆┆b0┆9. POWER SECTION↲
↲
The power requirement is : 220V,50Hz and 750W↲
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┆84┆┆84┆The power section includes four POW601 (a switch-mode power ↓
┆19┆┆89┆┄┄supply) in parallel. It converts the 220V ac to +5V, +12V↲
↲
┆84┆┆84┆The following drawings contain: ↲
↲
1. Power connections.↲
↲
2. Diagram of POW601.↲
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3. Component layout of POW601.↲
════════════════════════════════════════════════════════════════════════
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┆a1┆┆b0┆┆b0┆┆a1┆9.1 Power connections.↲
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┆84┆Fig 9.1.1 describes the connections inside the computer. Most ↓
┆19┆┆89┆┄┄of the power connectors use the standard AMP connectors in ↓
┆19┆┆89┆┄┄table 9.1.1.↲
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Fig 9.1.1 ┆84┆Power connections in the 3902 computer. The batteri ↓
┆19┆┆93┆┄┄section and the power supply number five are options.↲
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Table 9.1.1 ┆84┆The standard AMP connector used in most of the ↓
┆19┆┆95┆┄┄power connection. ↲
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┆a1┆┆b0┆9.2 Diagram of POW601.↲
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┆a1┆┆b0┆9.3 Component layout.↲
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┆b0┆┆a1┆┆a1┆↲
┆a1┆┆b0┆┆a1┆A. REFERENCES↲
↲
↲
1. ┆84┆Guide to using the iSBC 286/10. Single board computer. ↓
┆19┆┆8e┆┄┄RCSL 99-1 10000↲
↲
2. iSBC 012CX, Hardware ref manual. RCSL 99-1 10005.↲
↲
3. ┆84┆ITC602 intelligent terminal controller. Technical manual. ↓
┆19┆┆8e┆┄┄RCSL 44-RT2144.↲
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4. ┆84┆DTC 86-1 Host adapter for the INTEL multibus system. ↓
┆19┆┆8e┆┄┄RCSL 99-1 10001.↲
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5. ┆84┆5000 series of intelligent controllers. Reference manual ↓
┆19┆┆8e┆┄┄RCSL 99-1 10002.↲
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6. ┆84┆V100 series QEM maintaince manual. RCSL 99-1 10004.↲
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7. ┆84┆YD380 product specification. RCSL 99-1 10003.↲
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8. BPL606 backplane. Technical manual. RCSL 99-1 10005.↲
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9. RC 39 Selftest Concept. User's Guide. RCSL 99-1 10092.↲
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10. ┆84┆RC 3902 Selftest (Inl. MEM board). User's Guide. RCSL 99-1↓
┆19┆┆8e┆┄┄10094.↲
↲
11. ┆84┆ITC 602 HW Selftest. User's Guide. RCSL 99-1 10095↲
↲
12. RC39 Konfigureringsvejledning RCSL 99-1 10057↲
════════════════════════════════════════════════════════════════════════
↓
┆1a┆┆1a┆--------↲
↲
I/O Map :↲
↲
┆a1┆┆e1┆ ┆a1┆I/O addres