IBM 3278 Скачать руководство пользователя страница 1 | Manualshive

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Содержание 3278

Страница 1: ...Personal Computer _ IBM Personal Computer 3278 79 Emulation Adapter Technical Reference 1502336...

Страница 2: ...ut the system should be made to your authorized IBM Personal Computer dealer A Reader s Comment Form is provided at the back of this publication If this form has been removed address comments to IBM C...

Страница 3: ...pherals is likely to result in interference to radio and TV reception INSTRUCTIONS TO USER This equipment generates and uses radio frequency energy and if not installed and used properly i e in strict...

Страница 4: ...mounting screws attachment connector screws and ground wires are tightly secured If peripherals not offered by IBM are used with this equipment it is suggested that you use shielded grounded cables wi...

Страница 5: ...he hardware design and provides interface information for the IBM Personal Computer and IBM Personal Computer XT The information in this publication is for reference and is intended for hardware and s...

Страница 6: ...vi...

Страница 7: ...dapter Block Diagram 1 2 I O Address Locations 1 3 Interrupt Status Register 2DO 1 4 Visual Sound Register 2Dl 1 5 Cursor Address Register 2D2 2D3 1 6 Control Register 2D4 1 7 Scan Code Register 2D5 1...

Страница 8: ...viii...

Страница 9: ...ll system control signals and voltage requirements are provided through a 2 by 31 position card edge tab A coaxial connector type BNC joins this adapter card to the control unit The adapter card will...

Страница 10: ...Adapter Block Diagram Coax line Interface Personal Transformer Control Control Computer Interface If Data Bus Buffer Buffer Control Adapter Block Diagram 1 2...

Страница 11: ...lation adapter Base Address Low Address Hex I O Space Bits Register 200 000 Interru pt Status Register 201 001 Visual Sound Register 202 010 Cursor Address Register 7 0 203 o 1 1 Cursor Address Regist...

Страница 12: ...BM Personal Computer Bits 6 and 7 are Status S bits which are set and reset by the adapter Note Interrupt Level 2 is used by the emulation adapter Bit I S Function 0 I Keystro ke Accepted 1 I Reset Co...

Страница 13: ...other bits are affected by a Write operation I from the IBM Personal Computer to this address Each time this register is loaded by the adapter logic bit 2 in the Interrupt Status Register is set Frame...

Страница 14: ...and is set by the emulation adapter This register requires two addresses and can be read by the IBM Personal Computer This register contains the current value of the I O Address Counter In 3278 79 em...

Страница 15: ...internal to the emulation adapter and accessed by the IBM Personal Computer It requires one address to read and write Bit Function 0 Coax Enable 1 Reserved 2 Reserved 3 Keystroke Available 4 Reserved...

Страница 16: ...ol unit Thus it causes the control unit to timeout and set the GO TO SLEEP latch for that line Bit 1 Reserved Bit 2 Reserved Bit 3 This bit is set by the IBM Personal Computer and notifies the emulati...

Страница 17: ...interrupt to pass through to the IBM Personal Computer Scan Code Register 2DS This 8 bit register is internal to the emulation adapter and is set and reset by the IBM Personal Computer This register...

Страница 18: ...and is set and reset by the IBM Personal Computer It requires one address This register must be set by the IBM Personal Computer before enabling the coaxiallin1c Note The Terminal ID placed in this re...

Страница 19: ...e 8KB of RAM reserved for the emulation adapter The beginning address is CEOOO the ending address is CFFFF Base Address Low Address Hex Bits Register CEOOO Starting address PC Address bits 12 0 RAM Da...

Страница 20: ...spond to all good transmissions Coaxial Frame Bits Commands 56789 READ Poll include priority o 0 0 0 1 Read Data o 0 0 1 1 Read Address Counter High 00101 Spare o 0 1 1 1 Read Terminal ID o 1 0 0 1 Re...

Страница 21: ...Load Address Counter High o 0 1 o 0 Clear 00110 Spare o 1 o 0 0 Load Control Register o 1 010 Write Data o 1 1 o 0 Insert Byte o 1 1 1 0 Search Forward 1 000 0 Search Backward 10010 Load Address Coun...

Страница 22: ...1 14...

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