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About atariry

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    Space Invader

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    Cambridge, UK
  • Interests
    Microprocessors, Atari, Arduino, 68000

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  1. Many thanks 😀 I didn't know such quality schematics existed, even in the official manuals.
  2. All good points, so... 1) POKEY and PIA register address defines are there for future use. I do intend to add these chips in the future. Currently they are not wired or plugged in, but there is room for them on the breadboards. 2) some code left over from cut and pasting from OS source. That/this line serves no purpose (VBWAIT: lda ANTICrVCOUNT ;WAIT FOR NEXT VBLANK BEFORE MESSING). 3) I am not using NMI or IRQ, but didn't want to leave the vectors empty. To keep the code as short and simple as possible I write directly to hardware and I have not implemented shadow registers. However your code could be very helpful for a future revision. Thank you. The code was more or less cut and pasted from a disassembly of the OS. When I took a look at the 5200 OS source code I was rather shocked at the similarity. NOTE: my hardware has no video circuitry. I firstly want to view the outputs of GTIA on a scope and then later connect them to the FPGA. I will possibly add the original video combiner circuity just to try the various component changes and tweaks found in various forum posts, just to see how clean I can get the picture on my Dell. As I mentioned the picture from my 130XE is horrendous with very visible jail bars. I am no analogue expert, but I suspect part of the 130XE problem was caused by signal routing and grounding. Next step is to add the 32 channel logic analyser (known as "SUMP"), based on a cheap Chinese Spartan6 FPGA board, which incorporates 5V level shifters, bought for only $15 on AliExpress (google - RTV901T). I am still in the process of porting the code to this platform. Given how expensive even 16 channel logic analysers are, this is a super cheap solution.
  3. I used the Altirra emulator and replaced the system ROM with my own code assembled into a 16k binary with origin at $c000. Here is the code in case anyone is interested... ; ; Simple initialisation and display list code for ; "Atari on a Breadboard" project ; Uses the AS65 6502 assembler by Frank Kingswood. ; ; 05-Mar-2020 : atariry ; - First write. Add hardware location defines. ; - Start to add custom chip init code. ; 08-Mar-2020 : atariry ; - Add character set definitions. ; - Make sure all writes are to hardware registers. ; ;;;;;;;;; ; POKEY ; ;;;;;;;;; POKEY = $D200 POKEYrPOT0 = POKEY+0 POKEYrPOT1 = POKEY+1 POKEYrPOT2 = POKEY+2 POKEYrPOT3 = POKEY+3 POKEYrPOT4 = POKEY+4 POKEYrPOT5 = POKEY+5 POKEYrPOT6 = POKEY+6 POKEYrPOT7 = POKEY+7 POKEYrALLPOT = POKEY+8 POKEYrKBCODE = POKEY+9 POKEYrRANDOM = POKEY+10 POKEYrPOTGO = POKEY+11 POKEYrSERIN = POKEY+13 POKEYrIRQST = POKEY+14 POKEYrSKSTAT = POKEY+15 ; POKEYwAUDF1 = POKEY+0 POKEYwAUDC1 = POKEY+1 POKEYwAUDF2 = POKEY+2 POKEYwAUDC2 = POKEY+3 POKEYwAUDF3 = POKEY+4 POKEYwAUDC3 = POKEY+5 POKEYwAUDF4 = POKEY+6 POKEYwAUDC4 = POKEY+7 POKEYwAUDCTL = POKEY+8 POKEYwSTIMER = POKEY+9 POKEYwSKRES = POKEY+10 POKEYwSEROUT = POKEY+13 POKEYwIRQEN = POKEY+14 POKEYwSKCTL = POKEY+15 ;;;;;;;; ; GTIA ; ;;;;;;;; GTIA = $D000 GTIAwHPOSP0 = GTIA+0 GTIAwHPOSP1 = GTIA+1 GTIAwHPOSP2 = GTIA+2 GTIAwHPOSP3 = GTIA+3 GTIAwHPOSM0 = GTIA+4 GTIAwHPOSM1 = GTIA+5 GTIAwHPOSM2 = GTIA+6 GTIAwHPOSM3 = GTIA+7 GTIAwSIZEP0 = GTIA+8 GTIAwSIZEP1 = GTIA+9 GTIAwSIZEP2 = GTIA+10 GTIAwSIZEP3 = GTIA+11 GTIAwSIZEM = GTIA+12 GTIAwGRAFP0 = GTIA+13 GTIAwGRAFP1 = GTIA+14 GTIAwGRAFP2 = GTIA+15 GTIAwGRAFP3 = GTIA+16 GTIAwGRAFM = GTIA+17 GTIAwCOLPM0 = GTIA+18 GTIAwCOLPM1 = GTIA+19 GTIAwCOLPM2 = GTIA+20 GTIAwCOLPM3 = GTIA+21 GTIAwCOLPF0 = GTIA+22 GTIAwCOLPF1 = GTIA+23 GTIAwCOLPF2 = GTIA+24 GTIAwCOLPF3 = GTIA+25 GTIAwCOLBK = GTIA+26 GTIAwPRIOR = GTIA+27 GTIAwVDELAY = GTIA+28 GTIAwGRACTL = GTIA+29 GTIAwHITCLR = GTIA+30 GTIArM0PF = GTIA+0 GTIArM1PF = GTIA+1 GTIArM2PF = GTIA+2 GTIArM3PF = GTIA+3 GTIArP0PF = GTIA+4 GTIArP1PF = GTIA+5 GTIArP2PF = GTIA+8 GTIArP3PF = GTIA+7 GTIArM0PL = GTIA+8 GTIArM1PL = GTIA+9 GTIArM2PL = GTIA+10 GTIArM3PL = GTIA+11 GTIArP0PL = GTIA+12 GTIArP1PL = GTIA+13 GTIArP2PL = GTIA+14 GTIArP3PL = GTIA+15 GTIArTRIG0 = GTIA+16 GTIArTRIG1 = GTIA+17 GTIArTRIG2 = GTIA+18 GTIArTRIG3 = GTIA+19 ; GTIArwCONSOL = GTIA+31 ;;;;;;;;; ; ANTIC ; ;;;;;;;;; ANTIC = $D400 ANTICwDMACTL = ANTIC+0 ANTICwCHACTL = ANTIC+1 ANTICwDLISTL = ANTIC+2 ANTICwDLISTH = ANTIC+3 ANTICwHSCROL = ANTIC+4 ANTICwVSCROL = ANTIC+5 ANTICwPMBASE = ANTIC+7 ANTICwCHBASE = ANTIC+9 ANTICwWSYNC = ANTIC+10 ANTICwNMIEN = ANTIC+14 ANTICwNMIRES = ANTIC+15 ; ANTICrVCOUNT = ANTIC+11 ANTICrPENH = ANTIC+12 ANTICrPENV = ANTIC+13 ANTICrNMIST = ANTIC+15 ;;;;;;; ; PIA ; ;;;;;;; PIA = $D300 PIArwPORTA = PIA+0 PIArwPORTB = PIA+1 PIArwPACTL = PIA+2 PIArwPBCTL = PIA+3 ; ; PAGE2 = $0200 CHACT = PAGE2+1 DLIST_DATA = PWRUP DLIST_8BLANK = $70 DLIST_GR0 = 2 DLIST_LOADLMS = $40 DLIST_JUMPWAIT= $41 code org $c000 ;*************************************************************** ; POWER UP ROUTINES START HERE ;*************************************************************** ; PWRUP: sei ;DISABLE IRQ INTERRUPTS cld ;CLEAR DECIMAL FLAG. ldx #$FF txs ;SET STACK POINTER ; ; Clear all regisers of custom hardweare chips ; HARDI: lda #0 tax CLRCHP: sta GTIA,x sta ANTIC,x sta POKEY,x sta PIA,x inx bne CLRCHP ; ; initialise non hardware locations ; lda # hi CHSET sta ANTICwCHBASE lda #2 sta ANTICwCHACTL ; ldx #4 ;LOAD COLOR REGISTERS CLOOP: lda COLRTB,x sta GTIAwCOLPF0,x dex bpl CLOOP ; lda #6 ;PUT GTIA LUM VALUE INTO BACKGROUND REGISTER sta GTIAwCOLBK VBWAIT: lda ANTICrVCOUNT ;WAIT FOR NEXT VBLANK BEFORE MESSING lda # lo DLIST sta ANTICwDLISTL lda # hi DLIST sta ANTICwDLISTH lda #$22 ;34 = 32 (enable DMA) + 2 (standard playfield) sta ANTICwDMACTL ; INFLOOP: jmp INFLOOP ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; COLRTB: db $28,$CA,$94,$46,$00 DLIST: db DLIST_8BLANK,DLIST_8BLANK,DLIST_8BLANK db DLIST_LOADLMS+DLIST_GR0 db lo DLIST_DATA db hi DLIST_DATA db 2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2 db DLIST_JUMPWAIT db lo DLIST db hi DLIST ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; org $f000 CHSET: db $00,$00,$00,$00,$00,$00,$00,$00 ;$00 - space db $00,$18,$18,$18,$18,$00,$18,$00 ;$01 - ! db $00,$66,$66,$66,$00,$00,$00,$00 ;$02 - " db $00,$66,$FF,$66,$66,$FF,$66,$00 ;$03 - # db $18,$3E,$60,$3C,$06,$7C,$18,$00 ;$04 - $ db $00,$66,$6C,$18,$30,$66,$46,$00 ;$05 - % db $1C,$36,$1C,$38,$6F,$66,$3B,$00 ;$06 - & db $00,$18,$18,$18,$00,$00,$00,$00 ;$07 - ' db $00,$0E,$1C,$18,$18,$1C,$0E,$00 ;$08 - ( db $00,$70,$38,$18,$18,$38,$70,$00 ;$09 - ) db $00,$66,$3C,$FF,$3C,$66,$00,$00 ;$0A - asterisk db $00,$18,$18,$7E,$18,$18,$00,$00 ;$0B - plus db $00,$00,$00,$00,$00,$18,$18,$30 ;$0C - comma db $00,$00,$00,$7E,$00,$00,$00,$00 ;$0D - minus db $00,$00,$00,$00,$00,$18,$18,$00 ;$0E - period db $00,$06,$0C,$18,$30,$60,$40,$00 ;$0F - / db $00,$3C,$66,$6E,$76,$66,$3C,$00 ;$10 - 0 db $00,$18,$38,$18,$18,$18,$7E,$00 ;$11 - 1 db $00,$3C,$66,$0C,$18,$30,$7E,$00 ;$12 - 2 db $00,$7E,$0C,$18,$0C,$66,$3C,$00 ;$13 - 3 db $00,$0C,$1C,$3C,$6C,$7E,$0C,$00 ;$14 - 4 db $00,$7E,$60,$7C,$06,$66,$3C,$00 ;$15 - 5 db $00,$3C,$60,$7C,$66,$66,$3C,$00 ;$16 - 6 db $00,$7E,$06,$0C,$18,$30,$30,$00 ;$17 - 7 db $00,$3C,$66,$3C,$66,$66,$3C,$00 ;$18 - 8 db $00,$3C,$66,$3E,$06,$0C,$38,$00 ;$19 - 9 db $00,$00,$18,$18,$00,$18,$18,$00 ;$1A - colon db $00,$00,$18,$18,$00,$18,$18,$30 ;$1B - semicolon db $06,$0C,$18,$30,$18,$0C,$06,$00 ;$1C - < db $00,$00,$7E,$00,$00,$7E,$00,$00 ;$1D - = db $60,$30,$18,$0C,$18,$30,$60,$00 ;$1E - > db $00,$3C,$66,$0C,$18,$00,$18,$00 ;$1F - ? db $00,$3C,$66,$6E,$6E,$60,$3E,$00 ;$20 - @ db $00,$18,$3C,$66,$66,$7E,$66,$00 ;$21 - A db $00,$7C,$66,$7C,$66,$66,$7C,$00 ;$22 - B db $00,$3C,$66,$60,$60,$66,$3C,$00 ;$23 - C db $00,$78,$6C,$66,$66,$6C,$78,$00 ;$24 - D db $00,$7E,$60,$7C,$60,$60,$7E,$00 ;$25 - E db $00,$7E,$60,$7C,$60,$60,$60,$00 ;$26 - F db $00,$3E,$60,$60,$6E,$66,$3E,$00 ;$27 - G db $00,$66,$66,$7E,$66,$66,$66,$00 ;$28 - H db $00,$7E,$18,$18,$18,$18,$7E,$00 ;$29 - I db $00,$06,$06,$06,$06,$66,$3C,$00 ;$2A - J db $00,$66,$6C,$78,$78,$6C,$66,$00 ;$2B - K db $00,$60,$60,$60,$60,$60,$7E,$00 ;$2C - L db $00,$63,$77,$7F,$6B,$63,$63,$00 ;$2D - M db $00,$66,$76,$7E,$7E,$6E,$66,$00 ;$2E - N db $00,$3C,$66,$66,$66,$66,$3C,$00 ;$2F - O db $00,$7C,$66,$66,$7C,$60,$60,$00 ;$30 - P db $00,$3C,$66,$66,$66,$6C,$36,$00 ;$31 - Q db $00,$7C,$66,$66,$7C,$6C,$66,$00 ;$32 - R db $00,$3C,$60,$3C,$06,$06,$3C,$00 ;$33 - S db $00,$7E,$18,$18,$18,$18,$18,$00 ;$34 - T db $00,$66,$66,$66,$66,$66,$7E,$00 ;$35 - U db $00,$66,$66,$66,$66,$3C,$18,$00 ;$36 - V db $00,$63,$63,$6B,$7F,$77,$63,$00 ;$37 - W db $00,$66,$66,$3C,$3C,$66,$66,$00 ;$38 - X db $00,$66,$66,$3C,$18,$18,$18,$00 ;$39 - Y db $00,$7E,$0C,$18,$30,$60,$7E,$00 ;$3A - Z db $00,$1E,$18,$18,$18,$18,$1E,$00 ;$3B - [ db $00,$40,$60,$30,$18,$0C,$06,$00 ;$3C - \ db $00,$78,$18,$18,$18,$18,$78,$00 ;$3D - ] db $00,$08,$1C,$36,$63,$00,$00,$00 ;$3E - ^ db $00,$00,$00,$00,$00,$00,$FF,$00 ;$3F - underline db $00,$36,$7F,$7F,$3E,$1C,$08,$00 ;$40 - heart card db $18,$18,$18,$1F,$1F,$18,$18,$18 ;$41 - mid left window db $03,$03,$03,$03,$03,$03,$03,$03 ;$42 - right box db $18,$18,$18,$F8,$F8,$00,$00,$00 ;$43 - low right window db $18,$18,$18,$F8,$F8,$18,$18,$18 ;$44 - mid right window db $00,$00,$00,$F8,$F8,$18,$18,$18 ;$45 - up right window db $03,$07,$0E,$1C,$38,$70,$E0,$C0 ;$46 - right slant box db $C0,$E0,$70,$38,$1C,$0E,$07,$03 ;$47 - left slant box db $01,$03,$07,$0F,$1F,$3F,$7F,$FF ;$48 - right slant solid db $00,$00,$00,$00,$0F,$0F,$0F,$0F ;$49 - low right solid db $80,$C0,$E0,$F0,$F8,$FC,$FE,$FF ;$4A - left slant solid db $0F,$0F,$0F,$0F,$00,$00,$00,$00 ;$4B - up right solid db $F0,$F0,$F0,$F0,$00,$00,$00,$00 ;$4C - up left solid db $FF,$FF,$00,$00,$00,$00,$00,$00 ;$4D - top box db $00,$00,$00,$00,$00,$00,$FF,$FF ;$4E - bottom box db $00,$00,$00,$00,$F0,$F0,$F0,$F0 ;$4F - low left solid db $00,$1C,$1C,$77,$77,$08,$1C,$00 ;$50 - club card db $00,$00,$00,$1F,$1F,$18,$18,$18 ;$51 - up left window db $00,$00,$00,$FF,$FF,$00,$00,$00 ;$52 - mid box db $18,$18,$18,$FF,$FF,$18,$18,$18 ;$53 - mid window db $00,$00,$3C,$7E,$7E,$7E,$3C,$00 ;$54 - solid circle db $00,$00,$00,$00,$FF,$FF,$FF,$FF ;$55 - bottom solid db $C0,$C0,$C0,$C0,$C0,$C0,$C0,$C0 ;$56 - left box db $00,$00,$00,$FF,$FF,$18,$18,$18 ;$57 - up mid window db $18,$18,$18,$FF,$FF,$00,$00,$00 ;$58 - low mid window db $F0,$F0,$F0,$F0,$F0,$F0,$F0,$F0 ;$59 - left solid db $18,$18,$18,$1F,$1F,$00,$00,$00 ;$5A - low left window db $78,$60,$78,$60,$7E,$18,$1E,$00 ;$5B - display escape db $00,$18,$3C,$7E,$18,$18,$18,$00 ;$5C - up arrow db $00,$18,$18,$18,$7E,$3C,$18,$00 ;$5D - down arrow db $00,$18,$30,$7E,$30,$18,$00,$00 ;$5E - left arrow db $00,$18,$0C,$7E,$0C,$18,$00,$00 ;$5F - right arrow db $00,$18,$3C,$7E,$7E,$3C,$18,$00 ;$60 - diamond card db $00,$00,$3C,$06,$3E,$66,$3E,$00 ;$61 - a db $00,$60,$60,$7C,$66,$66,$7C,$00 ;$62 - b db $00,$00,$3C,$60,$60,$60,$3C,$00 ;$63 - c db $00,$06,$06,$3E,$66,$66,$3E,$00 ;$64 - d db $00,$00,$3C,$66,$7E,$60,$3C,$00 ;$65 - e db $00,$0E,$18,$3E,$18,$18,$18,$00 ;$66 - f db $00,$00,$3E,$66,$66,$3E,$06,$7C ;$67 - g db $00,$60,$60,$7C,$66,$66,$66,$00 ;$68 - h db $00,$18,$00,$38,$18,$18,$3C,$00 ;$69 - i db $00,$06,$00,$06,$06,$06,$06,$3C ;$6A - j db $00,$60,$60,$6C,$78,$6C,$66,$00 ;$6B - k db $00,$38,$18,$18,$18,$18,$3C,$00 ;$6C - l db $00,$00,$66,$7F,$7F,$6B,$63,$00 ;$6D - m db $00,$00,$7C,$66,$66,$66,$66,$00 ;$6E - n db $00,$00,$3C,$66,$66,$66,$3C,$00 ;$6F - o db $00,$00,$7C,$66,$66,$7C,$60,$60 ;$70 - p db $00,$00,$3E,$66,$66,$3E,$06,$06 ;$71 - q db $00,$00,$7C,$66,$60,$60,$60,$00 ;$72 - r db $00,$00,$3E,$60,$3C,$06,$7C,$00 ;$73 - s db $00,$18,$7E,$18,$18,$18,$0E,$00 ;$74 - t db $00,$00,$66,$66,$66,$66,$3E,$00 ;$75 - u db $00,$00,$66,$66,$66,$3C,$18,$00 ;$76 - v db $00,$00,$63,$6B,$7F,$3E,$36,$00 ;$77 - w db $00,$00,$66,$3C,$18,$3C,$66,$00 ;$78 - x db $00,$00,$66,$66,$66,$3E,$0C,$78 ;$79 - y db $00,$00,$7E,$0C,$18,$30,$7E,$00 ;$7A - z db $00,$18,$3C,$7E,$7E,$18,$3C,$00 ;$7B - spade card db $18,$18,$18,$18,$18,$18,$18,$18 ;$7C - | db $00,$7E,$78,$7C,$6E,$66,$06,$00 ;$7D - display clear db $08,$18,$38,$78,$38,$18,$08,$00 ;$7E - display backspace db $10,$18,$1C,$1E,$1C,$18,$10,$00 ;$7F - display tab ;;;;;;;;;;; ; VECTORS ; ;;;;;;;;;;; org $fffa dw PWRUP dw PWRUP dw PWRUP This is the resultant display...
  4. Thank you to everyone who has replied. Over the past few days I have updated the Kicad schematic and completed the wiring of all 3 Atari chips (currently no Pokey or PIO). I have also tried to refine my minimal boot, but I am sure that is it incomplete. FYI I have 16k RAM from 0000 to 4000 and 8k ROM from E000 to FFFF. This is emulated by the FPGA, but I have yet to try running the system to find out even if this is working. I used the FPGA as it was easier and quicker than physically wiring up RAM and ROM chips. The FPGA "sees" all address, data and control signals. In theory I could use the FPGA to emulate a Pokey, but for the custom chips I prefer to use real hardware. The end goal is to generate a clean HDMI video stream then wire up the solution to my 130XE whose video is of horrendous quality. Talking about the 5200 which I know has a different memory map to the 400/800, I spotted something which I am sure is well known to Atari experts, that GTIA has a chip select input, so can be anywhere in the memory map, whereas ANTIC already has all 16 address lines, so has the address select range built in. I had to add the address decode for GTIA to the FPGA code. I had a couple of ideas. I guess that I could replace the OS ROM on one of the emulators with my own OS? I think that some of the emulators have debug capability which might be the best way to go. Single step/trace would be ideal. I have rarely used any Atari emulator so have no idea which might be easiest/best. I also considered using an EPROM emulator in my 130XE which I know has a socketed ROM. There's no way of reaching the ROM with the emulator cable inside the 400/800 case. :-) I think that the full OS (even with hacking or adding RTS) is unlikely to work, but will make debugging more difficult. I intend to be using a 32 channel logic analyser to capture address, data, and control in order to determine what is and isn't working. I will take a look at the 5200 BIOS at it sounds like it might be easier to extract the code I require. For example in the 400/800 OS the display list is only setup when the OPEN command is executed and there is a lot os overhead which I don't need or want. --Atariry
  5. I have just dusted off an old partially started project, my Atari (800) on a breadboard. I have breadboarded Sally, Antic and GTIA and used buffers to allow a FPGA to see the address and data busses. In the FPGA code I generate the "xtal" clock and emulate a 16k RAM and 8k ROM. In the future the idea is to add code to convert the output from the GTIA into HDMI. I am aware of Sophia(?), which I think does something similar, and from memory appears to use a CPLD rather than a FPGA. However I want to implement this myself and add sound over HDMI too. So, I need a binary to load into the 8k ROM. Since Pokey and PIA are missing, I do not want to use the normal Atari ROM. I would like to generate some simple code to initialise the chips and display a simple 40 x 24 line text screen. I have been looking through the Atari OS source code and I have tried to pick out pieces I need, but I haven't ever programmed the custom chips at this low level before. I have also googled (the web and this site) but not found anything helpful. I would simply like to ask if anyone is aware of some assembly source which does initialisation of the various chips from scratch and then possibly creates a display list and initialises ANTIC and GTIA? Perhaps part of a bigger project? Perhaps there are some other older threads in this part of the forum which someone might recall? Note: I don't normally visit this area - so my apologies in advance. Once the project moves forward I will post some pictures in the main 8-bit forum. regards... --Atariry
  6. I am no expert, but I did make my own cart PCB (see my profile picture). The sockets are 24 pin which normally suggests a 4k ROM, however A12 is wired which suggests 8k ROMs. So this suggests that each socket is designed for a custom 8k ROM, making it a 16k cart as others have suggested. The two address range selects, notS4 and notS5 appear to go to either pin 20 or pin 21, so this must be the ROM not chip select input. The 2532 has pin 21 as chip select so I am guessing this, but you can buzz this out with a multimeter. Looking at A11 it connects to pin 18 which suggests a 2532 EPROM style pinout, which is not compatible with 2732 (4k) or the bigger pinout 2764 (8k). So appears to me to be a 8k custom ROM in a smaller 24 pin package, with not chip select on pin 20, A12 on pin 21, and A11 on pin 18. Obvious now I have googled the 2364 pinout. Hold on, I see that you have already figured out that the pinout is the rare(?) 2364, and tried an adapter. I think that if you use an adapter for a 2764 in each socket you should get the full 16k.
  7. Impressive work, especially with the RF shield. I was shouting "throw it away". It was surprising that the electronics were actually in good shape. In some C64 restoration videos the youtuber removes and throws away the RF shields (whatever their condition) and gets a lot of flack as a result.
  8. I often browse Ebay looking at Atari 8 bit items... The following took my attention "Atari 800 400 Computer Programmer's Reference Guide In VGC" for 5p short of £60. Ouch! Reason was that I had only recently taken my own copy (below) down off the bookcase shelf to look up some information. I saw that it cost $21.95 and had been bought from B&C Computervisions in Santa Clara, CA (back in 1985 when I was working for National Semiconductor). I've now misplaced the receipt, but they were at 3400 El Camino Real, Santa Clara, CA. I used to walk home and passed nearby the shop, but I only ever went in a couple of times. I remember buying a Monkey Wrench cart from there, but I 've never ever used it! My own Atari 800 was bought off a friend (at that time) who had made it from Atari parts sourced all over the valley, from scrap stores. To this day it is still missing the Atari sticker on the front. When I returned to the UK I converted it to UK video standard using parts (e.g. CPU PCB) from my Atari 400. (*) Just googled and found out that $22 in 1985 is the equivalent of $53 today. So that was an expensive purchase at the time!
  9. Ditto. Mine came with my 130XE. I've always wondered if this is a "safe" PSU. It gets rarely used, but I did try it recently and the computer powered up and operated OK.
  10. Thanks for the heads up. I live about an hour away, but sounds more like a games fest than a retro show. There is a lack of detail on the official website. So I'll be giving it a miss.
  11. I have just been browsing Ebay (UK). Saw the following "Rare Vintage Atari 400 computer console Untested". Later in the description "... No power lead hence sold as non working as cant test". Asking price (buy it now) £139.99 . I know having asking prices a penny less than a bigger number is quite common, but £140 is quite steep for an untested 400. No idea of memory, so have to assume 16k. No history of the item. At least when items are sold as "was last working before put in the loft", you have an idea it is been sold by a genuine owner. I hate to think how much the price would increase if it was tested and came with a power supply. Talking of which... "Original Atari 400 Power Supply A.C Mains Adaptor Atari PT. CO 60592-34/TM PSU" £35.99 (buy it now). I don't see these items listed often, but sounds steep to me.
  12. This Atari 800 cost £89 (found on Ebay UK) in Sep 2018. Was very poorly packaged, with only a single layer of bubble wrap. Appears to have been dropped on the corner by the courier. I used a solvent type glue (in the UK called UHU) often used to build plastic aeroplane models (Airfix - anyone?). NOTE: it melts the plastic. So I used tape on the outside to hold the broken off parts in place and used the glue on the inside of the case only. I then tried to find some fine filler, however the model shop didn't have anything suitable and what they sold me was way too fine. I used the filler to try to fill the (micro) cracks. I then used model paint to try to further cover the filler. The model shop didn't have the right colour of paint and sold me various colours to mix. You can see I made a really bad job of it 😂. I have to admit that I put it to one side and it still needs to be finished off. I really need to figure out how to mix the paint to get a good colour match.
  13. Just starting this thread to try to collect information on how best to repair damage to the computers case. I used google to search this site to see if a thread already existed, but nothing obvious appeared. Please advise if such a thread already exists. I am aware of the "tips/tricks" pinned thread, not sure if that should be used. Didn't want to steal a different thread where this started to be discussed. Post pictures of your damaged Atari, or repaired Atari, with details of which products you might have used. regards... --atariry
  14. Temporarily stealing this thread... I got my Atari 800 atr a good price, but the cost of time and travel to model shops to buy paint and glue all added up. I just checked. It cost £89 (found on Ebay UK) in Sep 2018. Perhaps we need a new thread on recommendations as to how to best repair this type of damage?
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