Questions tagged [tms9918]

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15 votes
4 answers
2k views

TMS9900 registers in RAM performance

Reading over the design of the TMS9900 it is often claimed that the R0 - R15 registers are in RAM because semiconductor RAM ran at the same speed as the CPU and therefore there was no penalty to doing ...
Maury Markowitz's user avatar
11 votes
3 answers
826 views

TMS9918 - why have separate data-in and data-out?

Usually 8bit video chips interface with DRAM using: an address bus for rows and columns, a bidirectional data bus in the case of 1bit DRAM data-in and data-out pins are shorted on the same data line....
Valentino Miazzo's user avatar
7 votes
1 answer
527 views

Are there any 1980's video chips still available besides the TMS9918?

The TMS9918 is still available, which is nice. But are there any other (better) video chips still on the (after-)market in any numbers? Obviously Commodore's VIC-II is not one of them.
Gunther Schadow's user avatar