Keith
J100_SG84_manual_htm.zipSG84 manual in html formZip Archive - 5.08 MB - 07/12/2021 at 13:09 |
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Hitachi_HD63485_HD63486_HD63487_datasheets.zipHD63485: Memory InterfaceHD63486: Video Attribute Controller HD63487: the two chips above combined into one This board used PAL chips to replace these chips. Zip Archive - 3.16 MB - 02/14/2021 at 02:21 |
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1986_11_BYTE_11-12_GT180-part-1.pdfThis is the nearest equivalent open-source design, by Steve Ciarcia for Byte magazine. It uses the HD63485 and HD63486 chips which are probably hard to get, but they make for easier design. They were expensive back then, which was why they were designed out of the SG84.Adobe Portable Document Format - 1.51 MB - 01/04/2022 at 21:25 |
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1986_12_BYTE_11-13_GT180-part-2.pdfPart 2 is about hardware. There is 512K of DRAM, as sixteen 64K by 4-bit dynamic RAM chips, giving a 64-bit word output. 32 bits into each of the two GVAC chips.Adobe Portable Document Format - 7.05 MB - 01/04/2022 at 21:25 |
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1987_01_BYTE_12-01_GT180-part-3.pdfPart 3 is about software.Adobe Portable Document Format - 7.95 MB - 01/04/2022 at 21:25 |
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