Free Colecovsion Ic kits to good home

Modern, Memotech inspired, hardware projects
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Free Colecovsion Ic kits to good home

Post by lezanderson » 07 Jun 2014 21:55

Free Colecovision kits to good home, anyone wanting one contact Dave.

The kit is roughly as below.

Z84C0020VEC PLCC Can be overclocked ?? maybe as high as 28MHz ??
UM61512 SDIP 32 64K Fast SRAM
W27C512 PLCC 64K Fast EEPROM
EPM7128 PLCC 2pcs
V9958 DIP64
D41464 DIP 6pcs
SN76489 DIP
AY-3-8910 DIP40
8255 /82C55 PLCC 2pcs One to read joysticks and one to read CF Card
DS12887 or similar RTC DIP
AM9511 Maths co-processor DIP
AM1377 DIP PAL/NTSC encoder

The Collection has a 3.5MHz clock as standard so:

28MHz (Master Clock) can be divide down to 14MHz,7Mhz,3.5Mhz, givivng it burst of Turbo mode

Memory management would be very simple , just switching in and out RAM, ROM as needed, depending on address.

I know the PLCC ICs ain’t well liked.. but they reduce board size by squeezing a lot into a small PCB area. And I believe you can overclock them more than normal DIP ICs ??

The idea being to design a small motherboard containing the very basics.. Z80 CPU, ROM,RAM, Video, Sound, I/O keyboard, joysticks.. Just a games console with keyboard and possible CF card reader

Then a daughter-board can fit on top via a SIL or similar header allowing extra expansion : AY-38910 second sound chip, Serial ports, RTC, & Maths co-processor !

This would turn it into a full and powerful CP/M machine ! And allow it to be built in more 'Manageable' modular two stages !

All the best

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