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Richard Atkinson

Sunday, 4 May 2014. Timex contended memory timings, the TS2068 kludge board and EXROM at $4000 - $7FFF (continued). This is a follow up post explaining the results of my oscilloscope investigation and my theories about how the TS2068 works. Timex contended memory timings, the TS2068 kludge board and EXROM at $4000 - $7FFF. This was first posted on the World of Spectrum hardware forum. It appears the Timex SCLD still applies memory contention at these locations when the RAM is paged out. I've written ...

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Sunday, 4 May 2014. Timex contended memory timings, the TS2068 kludge board and EXROM at $4000 - $7FFF (continued). This is a follow up post explaining the results of my oscilloscope investigation and my theories about how the TS2068 works. Timex contended memory timings, the TS2068 kludge board and EXROM at $4000 - $7FFF. This was first posted on the World of Spectrum hardware forum. It appears the Timex SCLD still applies memory contention at these locations when the RAM is paged out. I've written ...

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Richard Atkinson | rga24.blogspot.com Reviews

https://rga24.blogspot.com

Sunday, 4 May 2014. Timex contended memory timings, the TS2068 kludge board and EXROM at $4000 - $7FFF (continued). This is a follow up post explaining the results of my oscilloscope investigation and my theories about how the TS2068 works. Timex contended memory timings, the TS2068 kludge board and EXROM at $4000 - $7FFF. This was first posted on the World of Spectrum hardware forum. It appears the Timex SCLD still applies memory contention at these locations when the RAM is paged out. I've written ...

INTERNAL PAGES

rga24.blogspot.com

1

Richard Atkinson: EPROM images for switchable Timex Sinclair 2068 modification

http://rga24.blogspot.com/2013/11/eprom-images-for-switchable-timex.html

Sunday, 10 November 2013. EPROM images for switchable Timex Sinclair 2068 modification. Http:/ www.atkinsoft.com/ts2068.html. These are the images for the EPROMs used in the switchable TS2068 modification. Switchable TS2068 27256.rom. Switchable TS2068 27128.rom. These modifications are necessary to ensure that the computer starts up every time reliably when in Spectrum mode. Unfortunately it is not possible to boot reliably on a TS2068 from a 100% exact Spectrum ROM. 11D0 3E 3F LD A, 0x3F. 11D0 AF XOR A.

2

Richard Atkinson: EPROM images for BASIC on the Sega Master System

http://rga24.blogspot.com/2013/11/eprom-images-for-basic-on-sega-master.html

Sunday, 24 November 2013. EPROM images for BASIC on the Sega Master System. Http:/ www.atkinsoft.com/sega.html. Here are the images I've used for running BASIC on the Master System. Sega BASIC Level 2 (SC-3000) export header checksum removed.sms. Sega BASIC Level 3 V1 (SC-3000) export header checksum removed.sms. Sega BASIC Level 3 V1 (SC-3000) export header checksum removed 24K.sms. 639C C20963 JP NZ, 6309h / checksum first 32K - check bottom 8 bits of result is 0, jump to one beep error routine if not.

3

Richard Atkinson: Timex contended memory timings, the TS2068 kludge board and EXROM at $4000 - $7FFF (continued)

http://rga24.blogspot.com/2014/05/timex-contended-memory-timings-ts2068_4.html

Sunday, 4 May 2014. Timex contended memory timings, the TS2068 kludge board and EXROM at $4000 - $7FFF (continued). This is a follow up post explaining the results of my oscilloscope investigation and my theories about how the TS2068 works. Subscribe to: Post Comments (Atom). Timex contended memory timings, the TS2068 kludge . Timex contended memory timings, the TS2068 kludge . View my complete profile.

4

Richard Atkinson: Switchable Spectrum 48K / Timex 2068 ROM for Timex Sinclair 2068

http://rga24.blogspot.com/2013/11/switchable-spectrum-48k-timex-2068-rom.html

Sunday, 10 November 2013. Switchable Spectrum 48K / Timex 2068 ROM for Timex Sinclair 2068. Http:/ www.atkinsoft.com/ts2068.html. I have just finished a switchable TS2068 / Spectrum ROM modification and implemented it on two TS2068s. It uses a 32K EPROM chip for the HOME ROM and a 16K EPROM chip for the EX ROM. The channel 2 / 3 switch on the underside of the case is re-purposed as a ROM select switch. It controls the upper address bit on the two EPROMs. On the standard machine, jumpers W1 and W2 are fit...

5

Richard Atkinson: January 2011

http://rga24.blogspot.com/2011_01_01_archive.html

Monday, 10 January 2011. VIC-20 audio output - square wave tone generators, noise generator, DC offsets, clipping. I've been doing some more investigations into the VIC-20 audio output recently, initially focusing on the noise generator but later returning to the subject of DC offsets and clipping. Http:/ ploguechipsounds.blogspot.com/2010/09/vic-20-crs-bad-waveform-clipping.html. From 0 to 15). POKE 36874, 255-32 (Sets the bass tone generator to period 32, equivalent to 128 on the soprano generator).

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Richard Atkinson

Sunday, 4 May 2014. Timex contended memory timings, the TS2068 kludge board and EXROM at $4000 - $7FFF (continued). This is a follow up post explaining the results of my oscilloscope investigation and my theories about how the TS2068 works. Timex contended memory timings, the TS2068 kludge board and EXROM at $4000 - $7FFF. This was first posted on the World of Spectrum hardware forum. It appears the Timex SCLD still applies memory contention at these locations when the RAM is paged out. I've written ...

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