Preferably the "glue logic" for it will consist of standard logic, but if necessary I will consider a small FPGA (but rather not). Three bytes could be shifted to the Red, Green an Blue color inputs, and one to the intensity input, giving sixteen colours per pixel. which means we only need to have, (and manipulate) a 256000 bit (32K) frame buffer. To be able to keep the design simple, and thus cheap, but still able to be drive a VGA monitor, I pondered to support only the lowest VGA resolution of 320 x 200 with 16 colors. with Mode "D" timings, 70Hz, Horizontal Sync = 31.778 KHz, pixel clock 25.175 MHz). 74HC165 HARDWARE SPI ATMEGA FULLI want it to be capable of at least a 320x200 VGA full high resolution graphics 16 color display (i.e. The idea behind it is to bringing back a new home computer, such as they were popular in the 80's, but build with modern components, and using modern interfaces (VGA monitor instead of TV, SD-card storage devices instead of cassette recorders). 74HC165 HARDWARE SPI ATMEGA SOFTWAREBut early 2017 I changed my mind, because I wanted the ability to port software from various Z80 based homecomputers, of which there were many (many more than those using other processors, like the 6502, 6809, or 1802, to name a few). My long time desire (see this document File:My Home Computer intro.odt ) was to remake a home-computer inspired on, but not compatible with, the Sinclair spectrum and/or Amstrad CPC, Initially I considered not basing it on a Z80, but on an ARM7TDMI based simple micro-controller, (probably an STR710FZ2) running at 66MHz with 256 + 16 KB internal fast Flash and with 64K internal fast RAM and a separate external 32K VRAM. This first page describes what it took to design the hardware for RhoCoCo, planned future page will describe the design of an enclosure, and the firmware. This describes my desire, and the result of that desire, to build an 80's Home Computer in this decade (in the year 2017, 20). Less is more, less complexity, more fun is the driving force behind the Rhococo (Retro Home Color Computer). Conceptually it resembles my earlier ZX81 clone but when finished it will be a capable Z80 based 128K full color home computer, able to drive a VGA monitor in high resolution, and with 64 colors, it has sound, and will have (BBC) BASIC and an SD-card for storage. An expansion board can be connected to the main board in the top left corner. Above picture is an artist impression, showing how it could look, mounted on a plank of wood measuring 20cm wide and 22 cm deep. Project RhoCoCo Retro HOme COlor COmputerĪ brand new 8-bit homecomputer with modern parts.
0 Comments
Leave a Reply. |
Details
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |