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Timex 2000 series: Difference between revisions
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* The TS2068 is an American machine operating at 60Hz on a 110v power supply and generates an NTSC television picture (just like the Spectrums sold by mail order in the US by Sinclair) but with a [[Timex TS1000|TS1000]] (ZX81) compatible expansion bus. | * The TS2068 is an American machine operating at 60Hz on a 110v power supply and generates an NTSC television picture (just like the Spectrums sold by mail order in the US by Sinclair) but with a [[Timex TS1000|TS1000]] (ZX81) compatible expansion bus. | ||
There are also two modified versions of the TC2048; the TC2128 (Rebuiltion or similar) and the TC2144 (by Jarek Adamski). The TC2128 extends the TC2048 to 128K using the [[ZX Spectrum 128K | There are also two modified versions of the TC2048; the TC2128 (Rebuiltion or similar) and the TC2144 (by Jarek Adamski). The TC2128 extends the TC2048 to 128K using the [[ZX Spectrum+ 128K]] memory scheme. The TC2144 does the same but provides an extra 16K of memory between 0x8000 and 0xc000. Both upgrades allow the ULA to use the shadow screen in Bank 7 giving the machine a total of four screen areas. | ||
Although the Timex machines are similar to the 48K machine there are some timing differences: | Although the Timex machines are similar to the 48K machine there are some timing differences: | ||
* The AY-3-8910 sound chip runs at 1.76475 | * The AY-3-8910 sound chip runs at 1.76475 MHz. | ||
* The American machines have a 60 Hz interrupt as opposed to 50 Hz on the European machines. | * The American machines have a 60 Hz interrupt as opposed to 50 Hz on the European machines. | ||
* The scanline timings are different. | * The scanline timings are different. | ||
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|- style="height: 3em;" | |- style="height: 3em;" | ||
! 0x3FFF <br />0x2000 | ! 0x3FFF <br />0x2000 | ||
| Bank 1′ || rowspan="2" | | | Bank 1′ || rowspan="2" | 16K ROM || Bank 1 | ||
|- style="height: 3em;" | |- style="height: 3em;" | ||
!0x1FFF <br />0x0000 | !0x1FFF <br />0x0000 | ||