Обратите внимание: эта печатная плата изготавливается на заказ. Сроки производства и поставки могут варьироваться. Уточняйте у администрации перед оплатой. Фото демонстрирует типовую версию платы. Фактическое исполнение может отличаться по цвету маски, маркировке или разводке.
Use of this design is provided subject to the lo-tech.co.uk Terms and Conditions. Copyright (c) 2013,2014 Peacon Ltd.
Assembly
This PCB makes use of SMT components:
- SOIC chips have a pitch of 1.27mm
- 0603 package capacitors and resistors
Assembly requires flux and a temperature controlled soldering station.
Bill of Materials
| Part | Value | Device | Package | Qty | Farnell | Mouser |
|---|---|---|---|---|---|---|
| C1..C9 | 0.1uF | X7R Ceramic Capacitor | 0603 | 9 | 1414610 | C0603C104K4RACTU |
| C10 | 10uF | 16V Electrolytic | E2-5 | 1 | 9451056 | 140-REA100M1CBK0511P |
| IC1, IC2 | — | AS6C4008-55SIN 4Mb SRAM | SOIC-32 | 2 | 1562901 | 913-AS6C4008-55SIN |
| IC3, IC4 | — | 74HCT138D | SOIC-16 | 2 | 1201307 | 771-74HCT138D-T |
| IC5, IC6 | — | 74HCT30D | SOIC-20 | 2 | 1085303 | 771-HCT30D652 |
| IC7 | — | 74HCT245DW | SOIC-20 | 1 | 1085315 | 771-74HCT245D |
| IC8 | — | 74LS05D | SOIC-14 | 1 | 9592164 | 595-SN74LS05D |
| IC9 | — | 74HCT02D | SOIC-14 | 1 | 1085298 | 595-SN74HCT02D |
| RN1..RN5 | 10k | RESISTOR, ARRAY-4, 10K, 1206 | 1206 | 5 | 1770137 | 652-CAY16-103J4LF |
| SW1, SW2 | — | MULTICOMP MCNDS-08-V | DIP-16 | 2 | 9471596 | 774-2068 |
ISA Bracket
Uses Lo-tech ISA Slot Bracket Type 3.
DIP Switch Settings
The board is configured via two banks of DIP switches, which control whether each physical segment (=64KB) is active on the memory board.
JP1, when closed, excludes the first 16KB to provide compatibility with the IBM Personal Computer 5150 when the system board is populated with the minimum 16KB RAM. In this way, system memory can be expanded to the full 640KB (plus upper memory).
Switch position ON enables the corresponding page:
| Sw1 | Sw2 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Отзывы
Отзывов пока нет.