(WIP) Video memory concurrency - bank7 selector to address video or attribute RAM - found read and write data paths leading to video RAMs (F11, F12). - video RAMs CS generation.
by giuliof 1 year 6 months
2409ff30
(WIP) Other steps in video generation - Some notes regarding video attributes. - Found some stuck-at inputs.
by giuliof 1 year 6 months
f55ce769
(WIP) A long job in analog video output ! Read comments inside video_memory_management sheet for more informations. - Completed path between dot pattern output of character shift register and beam output transistor. - Found behavior of video attribute signals: blink, underline, stretch, hide. - Completed wiring of 28L22 ROM, which is involved in video attributes. - TODO: video_memory_management must be cleaned up, since schematics has grown outside sheet.
by giuliof 1 year 6 months
40ba09ed
Discovered bank 0 + fixed wrong signals in video gen
by giuliof 1 year 7 months
0f26ddb9
Notes and minor fixes
by giuliof 1 year 7 months
dee060e7
DRAM: row/column mux, parity generator (partial), memory ICs
by giuliof 1 year 8 months
c1664cfb
Missing signal in DRAM logic
by giuliof 1 year 8 months
359801f4
Partial signal renaming
by giuliof 1 year 8 months
2f7bd26e
RAM addressing, including DRAM ras and cas
by giuliof 1 year 8 months
9c1b16d9
Z80 halt controls the RUN LED
by giuliof 1 year 8 months
83326d44
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