Платы клона Пентагона в исполнении для корпуса "под резинку", известного как ZX Nucleon 512.
Версия 2Y
Маска зеленая. Финишное покрытие HASL. Комплектации нет.
В наличии 1 шт.
Цена платы - 800 руб. Плюс стоимость доставки по стране Почтой России.
Версия 3B
Маска фиолетовая. Финишное покрытие HASL. Комплектации нет.
В наличии временно нет.
Цена одной платы - 800 руб. Плюс стоимость доставки по стране Почтой России.
Материалы, необходимые для сборки
LIST OF VERSIONS AND CHANGES TO BOARD
Version 1A: Prototype version of the board
Version 1B: The first commercial version
Version 1C: Correction of several errors in the top silkscreen, a DI_ULA signal is connected to the GAL20V8 from the
system connector (IORQGE) for „ULA“ function disabling (in/out from/to port #254d)
Version 1D: Fix false CLK pulses for memory page register IC23 using C105; a CPU inverse CLK signal is output to the
system connector (as with ZX Spectrum); improve CPU clock quality by changing R5 and IC13; increased sensitivity of
tape-in input by adjusting the value of resistor R36
Version 2A: Video part redesigning - implementation of more reliable PAL encoders ROHM BH7236AF and
SAMSUNG KA2198BD, removing the composite video output and replacing it with a better S-VHS video signal.
Improving the quality of synchronization pulses (reduces image jitter during stripes in BORDER).
Version 2Q: Optional (using JP3 jumper) full, 8-bit I/O port addressing. If the jumper is not connected, the original,
incomplete addressing mode remains, like a ZX Spectrum and Pentagon. As of this version, it must only be used at
IC49 GAL22V10, can not be used GAL20V8! Input buffer from FEh port replaced by open collector output type for
external keyboard interface compatibility
Version 2X: Added pull-up resistor R63 to increase signal stability B3 and then image synchronization - high current
load through the inverter 74S04 input at the 74LS193 counter output
Version 2Y: IC19 replaced by 74LS175 as in the original Pentagon computer (in order to reduce stocks of this type
of IC). Regrouping location IC19, IC21, C93, D11 and R22 on the board. For R24+25 in 14MHz oscillator, change to
680R for higher reliability with 74LS04
Version 3A: based on version 2X. On the soldering side, add SJ1-4 solder connectors for selecting the type of audio
connectors Jack X1 and X2 (1503_08 or PJ322). Both types have the reverse connection of pins No. 1 and No. 3. R24
+ 25 in 14MHz oscillator change value to 680R for higher oscillation reliability. IC51 now also in SO8 case directly
on the board
Version 3B: adding positions for capacitors to compensate for errors in the image – fake pixels on the edge of characters
"ghosts" or image shift towards a Border, port decoder simplification - removal of the 8-bit addressing function
Последний раз редактировалось
djking 14 мар 2022, 14:38:06, всего редактировалось 5 раз.
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